WO2017018034A1

WO2017018034A1 - Optical switch device and design method therefor

Info

Publication number: WO2017018034A1
Application number: PCT/JP2016/065173
Authority: WO
Inventors: 健谷澤; 整河島; 池田　和浩; 恵治郎鈴木
Original assignee: 国立研究開発法人産業技術総合研究所
Priority date: 2015-07-27
Filing date: 2016-05-23
Publication date: 2017-02-02
Also published as: JP6521072B2; JPWO2017018034A1

Abstract

[Problem] To provide an optical switch device and the like capable of synchronizing and outputting/inputting two signals while the circuit size of a matrix switch is kept small. [Solution] With respect to a matrix switch in which N² 2-input 2-output optical switches that are switchable to either a cross or bar state are arranged in a matrix with N rows and N columns, where N is an integer of 2 or more, among 2N pairs of input/output ports formed by pairing an original port and an idle port respectively constituting one and the other of externally connectable two input/output ports in each input/output path of the matrix switch connected with all of the optical switches of the matrix switch being switched to the cross state, half, i.e., N, of the pairs including N of the original ports in the first column of the matrix switch are set as a first input/output pair group, and the remaining half, i.e., N, of the pairs are set as a second input/output pair group.

Description

Optical switch device and design method thereof

The present invention relates to an optical switch device using a matrix switch circuit configured by arranging N ² two-input two-output optical switches and a design method thereof.

In optical transmission, an optical cross-connect device is known as a device that can switch an optical path without converting light into electricity. When this optical cross-connect device is applied, the flexibility of the network can be increased and the management cost can be reduced.

The matrix switch used in the optical cross-connect device is also called a PILOSS (Path-independent Insertion Loss) switch, and an optical switch that can be switched to either a cross or a bar state with two inputs and two outputs on a square lattice. There are known a square lattice type matrix switch in which N ² pieces are arranged, and similarly, a rhombus lattice type matrix switch in which N ² pieces of the optical switches are arranged on a rhombus lattice (see, for example, Patent Document 1).

A specific circuit configuration of such a matrix switch will be described with reference to the drawings.
FIG. 1 is a diagram (1) showing a circuit configuration of a conventional square lattice matrix switch. As shown in figure 1, the tetragonal lattice matrix switch, for example, is configured by arranging four ^two optical switches S11 ~ S44 on a square lattice of four rows and four columns. Input ports A1 to A4 are set in the order of up, down, up and down in the upper and lower two externally connectable input / output ports in the first row, and the remaining input / output ports are unused. In the fourth row, the upper and lower two externally connectable input / output ports are set with the output ports B1 to B4 in the order of lower, upper and lower, and the remaining input / output ports are unused.
In this specification, input / output ports used in conventional matrix switches, including square lattice type matrix switches and rhombus lattice type matrix switches, are referred to as “original ports”, and unused input / output ports (in the figure) , *) Are referred to as “idle ports”.

Here, as shown in FIGS. 2A to 2C, each of the optical switches S11 to S44 has a cross state in which a line between a and d and a line between bc and a line between a and c and b and d, respectively. It is connected to one of the bar states where the gaps are connected. 2A is an explanatory diagram for explaining the optical switch, FIG. 2B is an explanatory diagram for explaining the cross state, and FIG. 2C is a diagram showing the bar state. It is explanatory drawing for demonstrating.
In the square lattice matrix switch configured as described above, any four optical switches among the optical switches S11 to S44 are set in a bar state and the rest are set in a cross state, thereby completely non-blocking and independent of path loss. The original ports of input ports A1 to A4 and output ports B1 to B4 are 4! It is possible to connect on the street.
The relationship between input and output is arbitrary, and the square lattice matrix switch shown in FIG. 1 can also use the input ports A1 to A4 as output ports and the output ports B1 to B4 as input ports.

FIG. 3 is a diagram showing a circuit configuration of a conventional rhombus lattice matrix switch. As shown in figure 3, rhombic lattice matrix switch, for example, is configured by arranging four ^two optical switches S11 ~ S44 on a square lattice of four rows and four columns.
Here, in the 1 × 1 optical switch S11, the lower input / output port of the two unconnected input / output ports is set as the original port as the input port A1, and the remaining input / output ports are set as idle ports. Is done. Further, in the optical switches S21 to S41 in the first column other than the optical switch S11, the unconnected input / output ports are set as the input ports A2 to A4 as original ports, and the optical switches S12 to S1 in the first row other than the optical switch S11 are set. In S14, the unconnected input / output port is set as an idle port.
In the 4 × 4 optical switch S44, the lower input / output port of the two unconnected input / output ports is set as the original port as the output port B1, and the remaining input / output ports are set as idle ports. In the optical switches S41 to S43 in the fourth row other than the optical switch S44, the unconnected input / output ports are set as the output ports B2 to B4 as original ports. Further, in the optical switches S14 to S34 in the fourth column other than the optical switch S44, the unconnected input / output ports are set as idle ports.
In the optical switch S14, each of the two unconnected input / output ports is set as an idle port. In the optical switch S41, the input / output port on the input port A3 side of the two unconnected input / output ports is the original port. And the input / output port on the output port B3 side is set as the original port to the output port B4.
In the rhombus lattice matrix switch configured as described above, four paths from the input port to the output port are assumed when any four of the optical switches S11 to S44 are in the bar state and the rest are in the cross state. However, it is completely non-blocking like the square lattice type matrix switch, and the original ports of the input ports A1 to A4 and the output ports B1 to B4 are 4! It is possible to connect on the street.
The relationship between input and output is arbitrary, and the rhomboid matrix switch shown in FIG. 3 can use the input ports A1 to A4 as output ports and the output ports B1 to B4 as input ports.

By the way, the present inventors have proposed a polarization diversity optical switch device using a square lattice matrix switch in order to make the input polarization independent of the optical switch (see Non-Patent Document 1). FIG. 4 is an explanatory diagram for explaining the polarization diversity optical switch device.
As shown in FIG. 4, in the polarization diversity optical switch device, each of the lights 1 to 4 is separated into a first polarization component and a second polarization component whose electric field amplitude directions are orthogonal to each other, and the first polarization The component is input to the upper square lattice type matrix switch (4 × 4 PILOSS switch) in the drawing, and the second polarization component is input to the lower square lattice type matrix switch (4 × 4 PILOSS switch) in the drawing. Two square lattice matrix switches are synchronized, and the first polarization component and the second polarization component to be output are polarization-coupled to be output as the original lights 1 to 4.
However, this polarization diversity optical switch device requires two square lattice matrix switches, and the circuit scale of the matrix switch (area, number of optical switches, number of wires, number of control terminals, etc.) is simply doubled. There is a problem.
This problem also occurs when the polarization diversity optical switch device is configured with a rhombus lattice matrix switch. This problem also occurs in other synchronous optical switches that use two signals in synchronization in addition to the polarization diversity optical switch device.

JP-T63-500140

An object of the present invention is to solve the above-mentioned problems in the prior art, and to provide an optical switch device capable of inputting / outputting two signals in synchronization with each other while keeping the circuit scale of the matrix switch small and a design method thereof. And

The present inventors diligently studied whether or not the above problem can be solved by using an input / output port set as an idle port in an empty state in a conventional matrix switch.
First, as one connection pattern of a 4 × 4 square lattice matrix switch, the optical switches S22, S24, S32, and S34 shown in FIG. 5A are set to the bar state, and the remaining optical switches are all set to the cross state. As a result, a connection pattern in which (input → output) is (A1 → B1), (A2 → B2), (A3 → B3), (A4 → B4) was examined. FIG. 5A is a diagram (1) illustrating an example of a connection pattern of a square lattice matrix switch.

Here, as shown in FIG. 5B, the input ports K1, K2, K3 and K4 are set in order from the top for the idle port on the input side, and (input → output) of K1 to K4 is ( The output ports L1 to L4 are set for the idle port on the output side so that K1 → L1), (K2 → L2), (K3 → L3), and (K4 → L4). FIG. 5B is a diagram (2) illustrating an example of a connection pattern of a square lattice matrix switch.
In the connection pattern shown in FIG. 5 (b), as described above, the input / output paths whose (input → output) are (A1 → B1), (A2 → B2), (A3 → B3), (A4 → B4) , (K1 → L1), (K2 → L2), (K3 → L3), and (K4 → L4) and two input / output paths are formed.
In this connection pattern, for example, the first polarization component and the second polarization component of the same light are input to one of the input ports one by one with (A1, K1) as a pair of input ports, B1 and L1) as a pair of output ports, the first polarization component and the second polarization component of the same light can be output from either output port one by one. Similarly, (A2, K2), Let (A3, K3), (A4, K4) be a pair of input ports for inputting the first polarization component and the second polarization component of the same light, and (B2, L2), (B3, L3), (B4, As a pair of output ports that output the first polarization component and the second polarization component of the same light as L4), the first polarization component and the second polarization component can be synchronized.

Next, in the square lattice type matrix switch, the connection pattern shown in FIG. 5B is switched to the connection pattern shown in FIG. 5C and used as a synchronous optical switch that inputs and outputs two signals in synchronization. Consider whether you can. FIG. 5C is a diagram (3) illustrating an example of a connection pattern of a square lattice matrix switch.
The connection pattern shown in FIG. 5C is a connection pattern when the optical switches S12, S22, S32, and S42 are switched to the bar state and the remaining optical switches are switched to the cross state. In this connection pattern, the input / output paths (input → output) are (A1 → B1), (A2 → B3), (A3 → B2), (A4 → B4), and (K1 → L4), (K2 → Two input / output paths are formed with the input / output paths of (L2), (K3 → L3), and (K4 → L1).
In addition, outputs corresponding to (A1, K1), (A2, K2), (A3, K3), and (A4, K4) that are pairs of input ports of the same polarization component of the first polarization component and the second polarization component The port pairs are (B1, L4), (B3, L2), (B2, L3), (B4, L1).

Now, the input port pair (A1, K1) is the input port of the first polarization component and the second polarization component of the light 1, and the input port pair (A2, K2) is the first polarization component of the light 2. And a pair of input ports (A3, K3) are input ports for the first polarization component and the second polarization component of the light 3, and a pair of input ports (A4, K4). ) Is the input port of the first polarization component and the second polarization component of the light 4, the output port pair (B3, L2) corresponding to the input port pair (A2, K2) The first polarization component and the second polarization component are output, and the first polarization component of the light 3 from the output port pair (B2, L3) corresponding to the input port pair (A3, K3). The second polarization component is output.
Based on the connection pattern shown in FIG. 5B, input pairs (A1, K1), (A2, K2), (A3, K3), (A) for inputting the first polarization component and the second polarization component of the same light. A pair of output ports corresponding to (A4, K4) is set as (B1, L1), (B2, L2), (B3, L3), (B4, L4). When the optical switch is switched to the connection pattern, the first polarization component of light 3 and the second polarization component of light 2 are combined, and the first polarization component of light 2 and the second polarization of light 3 are combined. The components are combined, and the

original lights

2 and 3 cannot be obtained. Similarly, the original light cannot be obtained from the outputs of the light 1 and 4 as well.
For use as a synchronous optical switch, (input → output) changes from (A2 → B2) (see FIG. 5 (b)) to (A2 → B3) (FIG. 5) in accordance with the change of the connection pattern by the switch of the optical switch. (C), the output destination of the input port K2 needs to be changed to the output port L3 which is a pair of the output port B3 in synchronization with the change. Similarly, when (input → output) is changed from (A3 → B3) (see FIG. 5 (b)) to (A3 → B2) (see FIG. 5 (c)), the output destination of the input port L3 is It is necessary to change to the output port L2 that is a pair of the output port B2 in synchronization with the change.
In other words, in order to use as a synchronous optical switch, it is a condition that the pair relationship between the input pair and the output pair set by the original connection pattern is not changed by the change of the connection pattern.

Next, it is examined whether the connection pattern shown in FIG. 6A can be used as a synchronous optical switch in a square lattice matrix switch. FIG. 6A is a diagram (4) illustrating an example of a connection pattern of a square lattice matrix switch.
In the connection pattern shown in FIG. 6 (a), unlike the connection pattern shown in FIG. 5 (b), the input ports K1 to K4 are set in order from the top to the idle ports on the output ports B1 to B4 side. The output ports L1 to L4 are set to the idle ports on the input ports A1 to A4 side so that (input → output) becomes (K1 → L1), (K2 → L2), (K3 → L3), (K4 → L4) Has been. The switch states of the optical switches S11 to S44 in the cross state and the bar state are the same as the connection pattern shown in FIG.

In the connection pattern shown in FIG. 6 (a), (input → output) is (A1 → B1), (A2 → B2), (A3 → B3), (A4 →) as in the connection pattern shown in FIG. 5 (b). Two input / output paths are formed: an input / output path that is (B4) and an input / output path that is (K1 → L1), (K2 → L2), (K3 → L3), and (K4 → L4), and (A1 , K1), (A2, K2), (A3, K3), (A4, K4) as input pairs, and (B1, L1), (B2, L2), (B3, L3), (B4, L4) As an output pair, the first polarization component and the second polarization component can be synchronized.

Next, it will be examined whether the connection pattern shown in FIG. 6A can be used as a synchronous optical switch when the connection pattern shown in FIG. 6B is changed. FIG. 6B is a diagram (5) illustrating an example of a connection pattern of a square lattice matrix switch.
The connection pattern shown in FIG. 6 (b) is the same switch as the connection pattern shown in FIG. 5 (c) from the connection pattern shown in FIG. 6 (a) in the cross state and the bar state switch state of S11 to S44 of the optical switch. It has been changed to the state.

In the connection pattern shown in FIG. 6B, unlike the connection pattern shown in FIG. 5C, (input → output) is (A1 → B1), (A2 → B3), (A3 → B2), (A4). → B4) and two input / output paths of (K1 → L1), (K2 → L3), (K3 → L2), and (K4 → L4) are formed. , (A1, K1), (A2, K2), (A3, K3), (A4, K4) as input pairs, (B1, L1), (B2, L2), (B3, L3), (B4 The first polarization component and the second polarization component can be synchronized using L4) as an output pair.

Further, it will be examined whether the connection pattern shown in FIG. 6A can be used as a synchronous optical switch when the connection pattern shown in FIG. 6C is changed. FIG. 6C is a diagram (6) illustrating an example of a connection pattern of a square lattice matrix switch.
The connection pattern shown in FIG. 6C is a connection pattern when the optical switches S13, S23, S33, and S43 are switched to the bar state and the remaining optical switches are switched to the cross state. In this connection pattern, the input / output paths (input → output) are (A1 → B2), (A2 → B1), (A3 → B4), (A4 → B3), and (K1 → L3), (K2 → Two input / output paths are formed with the input / output paths of (L4), (K3 → L1), and (K4 → L2).
At this time, the pair relationship of the input pairs (A1, K1), (A2, K2), (A3, K3), (A4, K4) of the connection patterns shown in FIGS. 6A and 6B is maintained. Then, the pair relationships of the output pairs of the connection patterns shown in FIGS. 6A and 6B are (B1, L1), (B2, L2), (B3, L3), (B4, L4) to (B2). , L3), (B1, L4), (B4, L1), (B3, L2).
Therefore, the input ports K1 to K4 are set as the idle ports on the output ports B1 to B4 side, and the output ports L1 to L4 are set as the idle ports on the input ports A1 to A4 side. Can not.

Subsequently, when the input ports K1 to K4 are set to the idle ports on the output ports B1 to B4 side, and the output ports L1 to L4 are set to the idle ports on the input ports A1 to A4 side, they are used as synchronous optical switches. Consider whether it can be done. Fig.7 (a) is a figure (7) which shows an example of the connection pattern of a square lattice type | mold matrix switch.
In the connection pattern shown in FIG. 7A, the settings of the input ports K1 to K4 and the output ports L1 to L4 are changed from the connection pattern shown in FIG. 6A as shown in the figure. The switch states of the optical switches S11 to S44 in the cross state and the bar state are the same as the connection pattern shown in FIG.

In the connection pattern shown in FIG. 7A, (input → output) is (A1 → B1), (A2 → B2), (A3 → B3), (A4) as in the connection pattern shown in FIG. 6 (a). → B4) and two input / output paths are formed: (K1 → L1), (K2 → L2), (K3 → L3), and (K4 → L4). (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs, and (B1, L1), (B2, L2), (B3, L3), (B4, L4) As the output pair, the first polarization component and the second polarization component can be synchronized.

Next, it will be examined whether the connection pattern shown in FIG. 7A can be used as a synchronous optical switch when the connection pattern shown in FIG. 7B is changed. FIG. 7B is a diagram (8) illustrating an example of a connection pattern of a square lattice matrix switch.
The connection pattern shown in FIG. 7B is the same switch state as the connection pattern shown in FIG. 6B from the connection pattern shown in FIG. 7A to the cross state and the bar state switch state of the optical switches S11 to S44. It has been changed to.

In the connection pattern shown in FIG. 7B, (input → output) is (A1 → B1), (A2 → B3), (A3 → B2), (A4) as in the connection pattern shown in FIG. 6 (b). → B4) and two input / output paths of (K1 → L1), (K2 → L3), (K3 → L2), and (K4 → L4) are formed. (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs, and (B1, L1), (B2, L2), (B3, L3), (B4, L4) ) As an output pair, the first polarization component and the second polarization component can be synchronized.

Further, it will be examined whether the connection pattern shown in FIG. 7A can be used as a synchronous optical switch when the connection pattern shown in FIG. 7C is changed. FIG. 7C is a diagram (9) illustrating an example of a connection pattern of a square lattice matrix switch.
In the connection pattern shown in FIG. 7C, the switch state in the cross state and the bar state of the optical switches S11 to S44 is changed from the connection pattern shown in FIG. 7A to the connection pattern shown in FIG. 6C. It has been changed.

In the example shown in FIG. 7C, unlike the connection pattern shown in FIG. 6C, the (input → output) is (A1 → B2), (A2 → B1), (A3 → B4), (A4 → B3) and the input / output paths of (K1 → L2), (K2 → L1), (K3 → L4), (K4 → L3) are formed, and still ( (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs, and (B1, L1), (B2, L2), (B3, L3), (B4, L4) As the output pair, the first polarization component and the second polarization component can be synchronized.
Further, in the setting of the input ports K1 to K4 and the output ports L1 to L4 shown in FIG. 7A, the cross state of the optical switches S11 to S44, even in a state other than the connection pattern shown in FIGS. 7B and 7C, We examined the operation of the synchronous optical switch by changing the switch state in the bar state. It was confirmed that the pair relationship between the input pair and the output pair was not changed in all the connection patterns, and could be operated as a synchronous optical switch. That is, it was confirmed that it can be operated as a completely non-blocking synchronous optical switch.

Further, when the setting of the input ports K1 to K4 and the output ports L1 to L4 in this completely non-blocking synchronous optical switch was studied, it was confirmed that the following regularity was obtained.
That is, in the square lattice matrix switch, each input / output path ((A1-K1), (A1)) of the matrix switch is connected in a state where all the optical switches (S11 to S44) are switched to the cross state (see FIG. 8). A2-K2), (A3-K3), (A4-K4), (B1-L1), (B2-L2), (B3-L3), (B4-L4)), two externally connectable inputs / outputs 2N (8) I / O port pairs ((A1, K1), (A2, K2), (A3, K3), (A4, K4), (B1, L1), Half of (B2, L2), (B3, L3), (B4, L4)) including N (4) original ports (A1 to A4) in the first row of a square lattice matrix switch in a pair N pairs (4) of the first I / O pair ((A1, K1), (A2, K2), (A3, K3), (A4, K4)), and the remaining half of the N (4) pairs are designated as the second input / output pair group ((B1, L1 ), (B2, L2), (B3, L3), (B4, L4)), the first input / output pair group ((A1, K1), (A2, K2), (A3, K3), (A4 , K4)) and the second input / output pair group ((B1, L1), (B2, L2), (B3, L3), (B4, L4)) as one input pair group and the other as the other A completely non-blocking synchronous optical switch as an output pair group is configured. FIG. 8 is a diagram illustrating a state in which all the optical switches of the square lattice matrix switch are connected in a cross state.

As the square lattice type matrix switch, the synchronous optical switch has been described based on the square lattice type matrix switch shown in FIG. 1, but the conventional square lattice type matrix switch shown in FIGS. Also in the switch (see FIGS. 5 and 6 of Patent Document 1), it has been confirmed that a completely non-blocking synchronous optical switch can be configured by the above regularity. FIG. 9A is a diagram (2) showing a circuit configuration of a conventional square lattice matrix switch, and FIG. 9B is a diagram (3) showing a circuit configuration of a conventional square lattice matrix switch. ).
That is, the square lattice type matrix switch shown in FIG. 1 and each square lattice type shown in FIGS. 9A and 9B are located above and below the original port and the idle port based on the difference in the connection method between adjacent optical switches. Although the relationship is different, any square lattice matrix switch is 4! A completely non-blocking matrix switch having a common connection pattern, and a completely non-blocking synchronous optical switch can be configured based on the regularity.

Further, FIG. 1, FIG. 9 (a), the square lattice-type matrix switch shown in (b), both arranged 4 ^two optical switches in four rows and four columns on the matrix, bar four optical switch 4 as a state! This is a completely non-blocking matrix switch having a normal connection pattern, but N is an integer of 2 or more, N ² optical switches are arranged on an N row N column matrix, and the N optical switches are in a bar state. As N! Even when generalized as a completely non-blocking matrix switch having a common connection pattern, a completely non-blocking synchronous optical switch can be configured based on the above regularity.

The above regularity is common to the rhombus lattice matrix switch.
That is, in the rhombus lattice matrix switch, each input / output path ((A1-K1), (A2) of the matrix switch connected in a state where all the optical switches (S11 to S44) are switched to the cross state (see FIG. 10). -K2), (A3-K3), (A4-K4), (B1-L1), (B2-L2), (B3-L3), (B4-L4)), two input / output ports that can be connected externally 2N (8) input / output port pairs ((A1, K1), (A2, K2), (A3, K3), (A4, K4), (B1, L1), ( B2, L2), (B3, L3), (B4, L4)), half of the pairs including N (four) original ports (A1 to A4) in the first row of the rhomboid matrix switch N (4) pairs as the first input / output pair ((A1, K1), (A2, K2), (A3, K3), (A4, K4)), and the remaining half of the N (4) pairs are designated as the second input / output pair group ((B1, L1 ), (B2, L2), (B3, L3), (B4, L4)), the first input / output pair group ((A1, K1), (A2, K2), (A3, K3), (A4 , K4)) and the second input / output pair group ((B1, L1), (B2, L2), (B3, L3), (B4, L4)) as an input pair group and the other as an output A completely non-blocking synchronous optical switch as a pair group is configured. FIG. 10 is a diagram illustrating a state in which all the optical switches of the rhombus lattice matrix switch are connected in a cross state.

The name of the rhomboid matrix switch is conceptually distinguished from the square lattice matrix switch, and the overall shape of the circuit does not necessarily have to be a rhombus, and there is a connection relationship between adjacent optical switches. As long as it is in common with the rhombus lattice matrix switch shown in FIG. 3, for example, the circuit having the square shape shown in FIG. 11 is included in the rhombus lattice matrix switch regardless of the overall shape of the circuit. Conversely, as long as the connection relationship between adjacent optical switches is in common with the square lattice type matrix switch shown in FIGS. 1, 9 (a) and 9 (b), a circuit having a different overall shape is also a square lattice type matrix switch. included. FIG. 11 is a diagram illustrating another configuration example of the rhomboid matrix switch.

The present invention is based on the above knowledge, and means for solving the above problems are as follows. That is,
<1> 2 input 2 switchable optical switch in one of two states: cross and bar output is disposed ^two N in a matrix of N rows and N columns where N is an integer of 2 or more, and a square lattice matrix switch A matrix switch having a circuit configuration of any one of the rhombic lattice matrix switches and an external input / output path of the matrix switch connected in a state where all the optical switches of the matrix switch are switched to the cross state Of the 2N input / output port pairs that are paired with the original port that constitutes one of the connectable two input / output ports and the idle port that constitutes the other, N of the matrix switches in the first row Half of the N pairs including the original port in the pair constitute the first input / output pair group, and the remaining half When N pairs are used as a second input / output pair group, the N ports connected in a one-to-one relationship with the original ports in either the first input / output pair group or the second input / output pair group. First optical input means, and N first optical outputs connected one-to-one with the unconnected original ports in one of the first input / output pair group and the second input / output pair group And N second optical input means connected in a one-to-one relationship with each of the idle ports including the original port connected to the first optical input means in the pair, and the first optical output means, An optical switch device comprising: N second optical output means connected in a one-to-one relationship with each of the unconnected idle ports including the original port to be connected in the pair.
<2> The optical switch device according to <1>, wherein the matrix switch has a circuit configuration of a square lattice matrix switch.
<3> Furthermore, the light is separated into a first polarization component and a second polarization component, the first polarization component is input to the first light input means, and the second polarization component is changed to the second polarization component. Polarization coupling of the N polarization splitting means input to the optical input means, and the first polarization component and the second polarization component output from the first optical output means and the second optical output means one by one The optical switch device according to any one of <1> to <2>, further including N polarization coupling units.
<4> A polarization splitter that splits light into a first polarization component and a second polarization component, and a polarization of any one of the first polarization component and the second polarization component. A first polarization rotating element that rotates the wave axis to the other polarization axis, and the polarization coupling means rotates the polarization axis by the first polarization rotating element, and A second polarization rotation element that re-rotates one of the polarization axes of the second polarization component to the original polarization axis before rotation, and the polarization axis is re-rotated by the second polarization rotation element; The optical switch device according to <3>, further comprising: a beam combiner that polarization-couples one of the first polarization component and the second polarization component.
<5> In the square lattice matrix switch, each optical switch from the first column to the N−1 column in the first row is connected to the optical switch in the first row and the optical switch in the next row in the next column, In the next column, the optical switches from the first column to the N−1 column are connected to the N rows of optical switches and the previous row of optical switches, and the second to N−1 rows from the first column to the N− Each optical switch up to one column is connected to the optical switch in the previous row and the optical switch in the next row in the next row, the row directions in all rows are parallel, and the column directions in all columns are parallel. A square lattice type matrix switch, which is substantially the same size and in the same row as the square lattice type matrix switch, and replaces all the optical switches of the square lattice type matrix switch with cross-connections. Positive connected In a state where the rectangular grid wiring is arranged opposite to each other in the column direction so that each of the cross-shaped connections forms one set with respect to each of the optical switches of the square grid matrix switch in plan view, Arranged on either the front or back surface of the square lattice matrix switch developed in a planar shape in the matrix direction, each set of the optical switch and the cross-shaped connection in the Nth column is the original of the optical switch A port and a port corresponding to the original port of the cross-shaped connection when the square lattice type wiring is regarded as the square lattice type matrix switch, and an idle port of the optical switch and the square lattice type A port corresponding to the idle port of the cross-like connection when wiring is regarded as the square lattice type matrix switch is connected. Each set of the optical switch and the cross-shaped connection in the first row is the cross-shaped connection when the original port of the optical switch and the square lattice type wiring are regarded as the square lattice type matrix switch. A port corresponding to the original port is connected to the common polarization separation means via the first optical input means and the second optical input means, and the idle port of the optical switch and the square lattice type wiring are connected to the square lattice A port corresponding to the idle port of the cross connection when viewed as a type matrix switch is connected to a common polarization coupling means via the first optical output means and the second optical output means Or the input / output relationship of light is reversed, and the original port of the optical switch and the square lattice type wiring are connected to the square lattice type matrix switch. And a port corresponding to the original port of the cross-shaped connection when viewed as a common polarization coupling means via the first light output means and the second light output means, and An idle port of an optical switch and a port corresponding to the idle port of the cross-like connection when the square lattice type wiring is regarded as the square lattice type matrix switch are the first optical input means and the second optical input. The optical switch device according to any one of <3> to <4>, wherein the optical switch device is connected to a common polarization separation unit through a unit.
<6> The pair of first light input means and the second light output means are N first input / output sections connectable to the N first input / output sources, and the pair of second light input means and the first light. The optical switch device according to any one of <1> to <2>, wherein the output unit includes N second input / output units connectable to N second input / output sources.
<7> 2 input 2 switchable optical switch in one of two states: cross and bar output is disposed ^two N in a matrix of N rows and N columns where N is an integer of 2 or more, and a square lattice matrix switch In each input / output path of the matrix switch that is connected in a state in which all the optical switches of the matrix switch are switched to the cross state with respect to the matrix switch having a circuit configuration of any one of the rhomboid matrix switches Of the 2N input / output port pairs to be paired with the original port constituting one of the two externally connectable input / output ports and the idle port constituting the other, N in the first row of the matrix switch And half of the N pairs including the original ports of the pair as the first input / output pair group, Method of designing an optical switching device, characterized in that the N pieces of said pair of half comprising the step of setting the second input-output pair group Ri.

According to the present invention, an optical switch device capable of solving the above-described problems in the prior art and capable of inputting and outputting two signals in synchronization with each other while keeping the circuit scale of the matrix switch small and a design method thereof are provided. Can be provided.

It is a figure (1) which shows the circuit structure of the conventional square lattice type | mold matrix switch. It is explanatory drawing for demonstrating an optical switch. It is explanatory drawing for demonstrating a cross state. It is explanatory drawing for demonstrating a bar state. It is a figure which shows the circuit structure of the conventional rhombus type | mold matrix switch. It is explanatory drawing for demonstrating a polarization diversity optical switch apparatus. It is a figure (1) which shows an example of the connection pattern of a square lattice type | mold matrix switch. It is a figure (2) which shows an example of the connection pattern of a square lattice type matrix switch. It is a figure (3) which shows an example of the connection pattern of a square lattice type matrix switch. It is a figure (4) which shows an example of the connection pattern of a square lattice type matrix switch. It is a figure (5) which shows an example of the connection pattern of a square lattice type matrix switch. It is a figure (6) which shows an example of the connection pattern of a square lattice type matrix switch. It is a figure (7) which shows an example of the connection pattern of a square lattice type matrix switch. It is a figure (8) which shows an example of the connection pattern of a square lattice type matrix switch. It is a figure (9) which shows an example of the connection pattern of a square lattice type matrix switch. It is a figure which shows the state which connected all the optical switches of the square lattice type | mold matrix switch as a cross state. It is a figure (2) which shows the circuit structure of the conventional square lattice type | mold matrix switch. It is a figure (3) which shows the circuit structure of the conventional square lattice type | mold matrix switch. It is a figure which shows the state which connected as a cross state all the optical switches of a rhombus type | mold matrix switch. It is a figure which shows the modification of a rhombus lattice type | mold matrix switch. It is explanatory drawing explaining the structure of the optical switch apparatus which concerns on 1st Embodiment. It is explanatory drawing explaining operation | movement of the optical switch apparatus which concerns on 1st Embodiment. It is explanatory drawing explaining the structure of the optical switch apparatus which concerns on 2nd Embodiment. It is explanatory drawing explaining operation | movement of the optical switch apparatus which concerns on 2nd Embodiment. It is explanatory drawing explaining the structure of the optical switch apparatus which concerns on 3rd Embodiment. It is explanatory drawing explaining operation | movement of the optical switch apparatus which concerns on 3rd Embodiment. It is explanatory drawing explaining the structure of the optical switch apparatus which concerns on 4th Embodiment. It is explanatory drawing explaining operation | movement of the optical switch apparatus which concerns on 4th Embodiment. It is explanatory drawing explaining the structure of the optical switch apparatus which concerns on 5th Embodiment. It is explanatory drawing explaining operation | movement of the optical switch apparatus which concerns on 5th Embodiment. It is a figure which shows the circuit structure of the square lattice type | mold matrix switch which comprises the optical switch apparatus which concerns on 5th Embodiment. It is a figure which shows the circuit structure of the square lattice type | mold wiring which comprises the optical switch apparatus which concerns on 5th Embodiment. It is explanatory drawing (1) explaining the state which has arrange | positioned the square lattice type | mold wiring on the square lattice type | mold matrix switch. It is explanatory drawing (2) explaining the state which has arranged the square lattice type | mold wiring on the square lattice type | mold matrix switch. It is a figure which shows the modification of the optical switch apparatus which concerns on 5th Embodiment. It is explanatory drawing explaining the structure of the optical switch apparatus which concerns on 6th Embodiment. It is explanatory drawing explaining operation | movement of the optical switch apparatus which concerns on 6th Embodiment.

(Optical switch device)
The optical switch device of the present invention includes at least a matrix switch, first light input means, second light input means, first light output means, and second light output means.

It said matrix switch, optical switch arranged ^two N in a matrix of N rows and N columns where N is an integer of 2 or more, are any of the circuit configuration of the square lattice-type matrix switch and rhombic lattice matrix switch.

The optical switch is not particularly limited as long as it is an optical switch (see FIGS. 2 (a) to 2 (c)) that can be switched to either a cross state or a bar state with two inputs and two outputs. The prism can be appropriately selected according to the purpose.

The tetragonal lattice matrix switch, the optical switch is arranged ^two N on square lattice matrix of N rows and N columns where N is an integer of 2 or more, any of N to the optical switch and the bar state, the remaining The optical switch is set to the cross state, and N! It is a matrix switch that can be connected in the street.
The square lattice matrix switch is not particularly limited, and can be appropriately selected from known square lattice matrix switches according to the purpose, and is shown in FIGS. 1, 9A and 9B. Others in which the wiring relationship between the adjacent optical switches and the square lattice type matrix switch of 4 rows and 4 columns and the square lattice type matrix switch of 4 rows and 4 columns shown in FIGS. Examples thereof include a square lattice type matrix switch and a square lattice type matrix switch obtained by generalizing these square lattice type matrix switches into N rows and N columns.

The rhombic lattice matrix switch, the optical switch is arranged ^two N on the rhombic matrix with N rows and N columns where N is an integer of 2 or more, and any N number of the optical switch and the bar state, the remaining With the optical switch in the cross state, N! It is a matrix switch that can be connected in the street.
The rhombus lattice type matrix switch is not particularly limited, and can be appropriately selected from known rhombus lattice type matrix switches according to the purpose. The rhombus lattice type of 4 rows and 4 columns shown in FIGS. Matrix switch, other rhombus grid type matrix switch having a common connection relationship between the adjacent optical switch and the 4 × 4 rhombus grid type matrix switch shown in FIGS. 3 and 11, and these rhombus grid type matrix switches Is a rhombus lattice matrix switch that is generalized to N rows and N columns.

In the rhomboid matrix switch, the number of the optical switches that pass between the input / output paths is different, and the light attenuation action is different between the input / output paths. Since all the input / output paths are formed via the same number of the optical switches, it is possible to output light that is not affected by the attenuation effect or the like for each input / output path (independent of path loss).

The first light input means and the second light input means are not particularly limited, and are known light transmitting devices such as optical fibers or the like that transmit light from the light transmitting device such as an optical fiber to the matrix switch. An optical transmission member is mentioned.
Further, the first optical output means and the second optical output means are not particularly limited, and light output from the matrix switch such as an optical fiber is supplied to the optical receiving apparatus in addition to the known optical receiving apparatus itself. A known optical transmission member for transmission may be used.

In the optical switch device, the first optical input means, the second optical input means, the first optical output means, the second optical output means, and the input / output ports of the matrix switch are shown in FIGS. Are connected based on the regularity previously discussed.
That is, the optical switch device includes two input / output paths that can be connected externally in each input / output path of the matrix switch and the matrix switch connected in a state where all the optical switches of the matrix switch are switched to the cross state. Of the 2N I / O port pairs paired with the original port constituting one of the output ports and the idle port constituting the other, the N original ports in the first column of the matrix switch are the pair. Half of the N pairs included in the first input / output pair group and the remaining half of the N pairs as the second input / output pair group, the first input / output pair group and the second input / output pair N first optical input means connected one-to-one with the original ports in any one of the pair groups, and the first input / output pair group And the N first optical output means connected in a one-to-one relationship with the unconnected original ports in any one of the second input / output pair groups, and the original connected to the first optical input means N second optical input means connected in a one-to-one relationship with each of the idle ports that include the port in the pair, and the unconnected, the original port that is connected to the first optical output means in the pair N second optical output means connected to each idle port on a one-to-one basis.

In the optical switch device configured as described above, it is possible to realize a synchronous optical switch that can input and output two signals by synchronizing them while keeping the circuit scale of the matrix switch small. Examples of the configuration of the synchronous optical switch include a polarization diversity optical switch and a bidirectional optical switch described later as the first to fourth embodiments of the present invention.

(Design method of optical switch device)
The design method of the optical switch device of the present invention is a method of designing the optical switch device of the present invention based on the regularity. That is, N ² optical switches that can be switched to either the cross state or the bar state with two inputs and two outputs are arranged on the matrix of N rows and N columns, where N is an integer, and the square lattice matrix switch And each of the matrix switches connected in a state in which all the optical switches of the matrix switch are switched to the cross state with respect to the matrix switch having a circuit configuration of any one of the rhomboid matrix switch. Of the 2N input / output ports paired with the original port that constitutes one of two externally connectable input / output ports in the output path and the idle port that constitutes the other, of the matrix switch Half of the N pairs including the N original ports in the first row in the pair. (A) is set as the first input / output pair group, and the remaining half of the N pairs are set as the second input / output pair group.
The setting items other than the steps can be appropriately selected from the items described in the first to fourth embodiments of the optical switch device and the optical switch device described later.
Hereinafter, application examples of the optical switch device will be described as first to fourth embodiments, but the idea of the present invention is not limited to these application examples.

<First Embodiment>
A first embodiment of the optical switch device will be described with reference to FIGS. The first embodiment relates to an embodiment in which the optical switch device is applied as the polarization diversity optical switch using the square lattice matrix switch. FIG. 12 is an explanatory diagram illustrating the configuration of the optical switch device according to the first embodiment, and FIG. 13 is an explanatory diagram illustrating the operation of the optical switch device according to the first embodiment.

As shown in FIG. 12, the optical switch device according to the first embodiment includes the square lattice matrix switch of 4 rows and 4 columns.
In this square lattice matrix switch, referring to FIG. 8 again, each input / output path of the matrix switch connected in a state where all the optical switches (S11 to S44) are switched to the cross state based on the regularity described above. ((A1-K1), (A2-K2), (A3-K3), (A4-K4), (B1-L1), (B2-L2), (B3-L3), (B4-L4)) Eight input / output port pairs (A1, K1), (A2, K2), (A3, K3), (A4, K4), (B1, paired between two externally connectable input / output ports L1), (B2, L2), (B3, L3), (B4, L4), half of the four including the four original ports (A1 to A4) in the first row of the square lattice matrix switch Pair is the first I / O pair ((A1, K1), (A2, K2), (A3, K3), (A4, K4)), and the remaining four pairs constitute the second input / output pair group ((B1, L1), (B2, L2), (B3, L3), (B4, L4)).
The first input / output pair group ((A1, K1), (A2, K2), (A3, K3), (A4, K4)) and the second input / output pair group ((B1, L1), (B2, L2) ), (B 3, L 3), (B 4, L 4)) are arbitrary as an input pair group and an output pair group, but in the example shown in FIG. The output pair group ((A1, K1), (A2, K2), (A3, K3), (A4, K4)) is taken as the input pair group, and the second input / output pair group ((B1, L1), (B2, L2), (B3, L3), (B4, L4)) are set as an output pair group.

Thus, the input pair group ((A1, K1), (A2, K2), (A3, K3), (A4, K4)) and the output pair group ((B1, L1), (B2, L2), (B3 , L3), (B4, L4)) in the first embodiment, the four polarizations that separate the lights 1 to 4 into the first polarization component and the second polarization component The separating means X1 to X4 are connected to the square lattice matrix switch as follows.
That is, the input pair (A1, K1) is connected to the polarization separation means X1, the input pair (A2, K2) is connected to the polarization separation means X2, and the input pair (A3, K3) is connected to the polarization separation means X3. The input pair (A4, K4) is connected to the polarization separation means X4.
Each of the polarization separation means X1 to X4 adds the beams 1 to 4 to the first polarization component and the second polarization component, and the polarization axis of the second polarization component is the first polarization. It has a polarization rotation element that rotates about the polarization axis of the component. When such a polarization rotation element is used, in the square lattice matrix switch, the first polarization component and the second polarization component can be handled as homogeneous polarization components.
Between the polarization rotation element of the polarization separation means X1 and the input port A1, between the polarization rotation element of the polarization separation means X2 and the input port A2, between the polarization rotation element of the polarization separation means X3 and the input port A3, and the polarization The polarization rotation element of the wave separation means X4 and the input port A4 are connected by an optical waveguide such as an optical fiber as the first light input means. Similarly, between the beam splitter and the input port K1 of the polarization separation means X1, between the beam splitter and the input port K2 of the polarization separation means X2, between the beam splitter and the input port K3 of the polarization separation means X3, and the polarization The beam splitter of the separating means X4 and the input port K4 are connected by an optical waveguide such as an optical fiber as the second light input means.

On the output side, the output pair (B1, L1) is connected to the polarization coupling means Y1, the output pair (B2, L2) is connected to the polarization coupling means Y2, and the output pair (B3, L3) is polarized. It is connected to the coupling means Y3, and the output pair (B4, L4) is connected to the polarization coupling means Y4.
Each polarization coupling means Y1 to Y4 rotates the second polarization component after rotation in addition to the beam combiner that couples the first polarization component and the second polarization component to the original light 1 to 4. It has a polarization rotation element that re-rotates to the previous original polarization axis. When such a polarization rotation element is used, in the square lattice matrix switch, the first polarization component and the second polarization component can be handled as homogeneous polarization components. The beam splitter and the beam combiner are configured with known prisms or the like, and a common one can be used. Further, the polarization rotation element is also composed of a known rotation element, and a common element can be used for the polarization separation means and the polarization coupling means.
Between the polarization rotation element of the polarization coupling means Y1 and the output port B1, between the polarization rotation element of the polarization coupling means Y2 and the output port B2, between the polarization rotation element of the polarization coupling means Y3 and the output port B3, and between The polarization rotation element of the wave coupling means Y4 and the output port B4 are connected by an optical waveguide such as an optical fiber as the first light output means. Similarly, between the beam combiner and output port L1 of the polarization coupling means Y1, between the beam combiner and output port L2 of the polarization coupling means Y2, between the beam combiner and output port L3 of the polarization coupling means Y3, The beam coupler of the polarization coupling means Y4 and the output port L4 are connected by an optical waveguide such as an optical fiber as the second light output means.

In the optical switch device according to the first embodiment configured as described above, (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs, and (B1, L1) , (B2, L2), (B3, L3), (B4, L4) as output pairs, the first polarization component and the second polarization component can be synchronized.
That is, as shown in FIG. 13, when the optical switches S12, S14, S42, and S44 are set to the bar state and the remaining optical switches are set to the cross state, (input → output) is (A1 → B4), (A2 → B3). , (A3 → B2), (A4 → B1) and (K1 → L4), (K2 → L3), (K3 → L2), (K4 → L1) input / output paths are formed, (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs, and (B1, L1), (B2, L2), (B3, L3), (B4, L4) ) As an output pair, the first polarization component and the second polarization component can be synchronized. Further, among the optical switches S11 to S44, if any other four optical switches are set to the bar state and the remaining optical switches are set to the cross state, the relationship between the input pair and the output pair is not changed, and all four! (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs in the street connection state, and (B1, L1), (B2, L2), (B3, L3) , (B4, L4) as output pairs, the first polarization component and the second polarization component can be synchronized (for example, see FIGS. 7A, 7B, and 7C).

Second Embodiment
A second embodiment of the optical switch device will be described with reference to FIGS. The second embodiment relates to an embodiment in which the optical switch device is applied as the polarization diversity optical switch using the rhombus lattice matrix switch. FIG. 14 is an explanatory diagram illustrating the configuration of the optical switch device according to the second embodiment, and FIG. 15 is an explanatory diagram illustrating the operation of the optical switch device according to the second embodiment.

As shown in FIG. 14, the optical switch according to the second embodiment is the same as the first embodiment except that a rhomboid matrix switch is used instead of the square lattice matrix switch in the optical switch according to the first embodiment. It is set as the structure similar to the optical switch concerning.
That is, referring again to FIG. 10, based on the regularity described above, each input / output path ((A1-K1)) of the matrix switch connected in a state where all the optical switches (S11 to S44) are switched to the cross state. , (A2-K2), (A3-K3), (A4-K4), (B1-L1), (B2-L2), (B3-L3), (B4-L4)) Eight input / output port pairs (A1, K1), (A2, K2), (A3, K3), (A4, K4), (B1, L1), (B2, Of L2), (B3, L3), and (B4, L4), the four pairs of the first half including the four original ports (A1 to A4) in the first row of the rhomboid matrix switch are the first. Input / output pair group ((A1, K1), (A2, K ), (A3, K3), (A4, K4)), and the remaining four pairs are the second input / output pair groups ((B1, L1), (B2, L2), (B3, L3)). , (B4, L4)).
These first input / output pair groups ((A1, K1), (A2, K2), (A3, K3), (A4, K4)) are set, and the remaining four pairs are the second input / output pair groups. ((B1, L1), (B2, L2), (B3, L3), (B4, L4)) are the same as those in the optical switch device according to the first embodiment. The polarization separation means X1 to X4 and the polarization coupling means Y1 to Y4 are connected via the light input means, the first light output means and the second light output means.

In the optical switch device according to the second embodiment configured as described above, (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs, and (B1, L1) , (B2, L2), (B3, L3), (B4, L4) as output pairs, the first polarization component and the second polarization component can be synchronized.
That is, as shown in FIG. 15, when the optical switches S11, S21, S33, and S44 are set to the bar state and the remaining optical switches are set to the cross state, (input → output) is (A1 → B4), (A2 → B3). , (A3 → B2), (A4 → B1) and (K1 → L4), (K2 → L3), (K3 → L2), (K4 → L1) input / output paths are formed, (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs, and (B1, L1), (B2, L2), (B3, L3), (B4, L4) ) As an output pair, the first polarization component and the second polarization component can be synchronized. Also, even if another arbitrary four optical switches among the optical switches S11 to S44 are set to the bar state and the remaining optical switches are set to the cross state, the pair relationship between the input pair and the output pair is not changed, and all four! (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs in the street connection state, and (B1, L1), (B2, L2), (B3, L3) , (B4, L4) as output pairs, the first polarization component and the second polarization component can be synchronized.
Note that the input and output settings are optional, and the input / output relationship can be inverted as in the optical switch device according to the first embodiment.

<Third Embodiment>
A third embodiment of the optical switch device will be described with reference to FIGS. The third embodiment relates to an embodiment in which the optical switch device is applied as the bidirectional optical switch using the square lattice matrix switch. FIG. 16 is an explanatory diagram illustrating the configuration of the optical switch device according to the third embodiment, and FIG. 17 is an explanatory diagram illustrating the operation of the optical switch device according to the third embodiment.

Unlike the optical switch device according to the first embodiment, the optical switch device according to the third embodiment does not perform polarization separation or polarization coupling of light, and (A1, K1), (A2, K2), (A3 , K3), (A4, K4) and the second input / output pair group (B1, L1), (B2, L2), (B3, L3), (B4, L4). Used as a bidirectional optical switch.

As shown in FIG. 16, the optical switch device according to the third embodiment has a 4 × 4 square lattice matrix switch.
In this square lattice matrix switch, referring to FIG. 8 again, each input / output path of the matrix switch connected in a state where all the optical switches (S11 to S44) are switched to the cross state based on the regularity described above. ((A1-K1), (A2-K2), (A3-K3), (A4-K4), (B1-L1), (B2-L2), (B3-L3), (B4-L4)) Eight input / output port pairs (A1, K1), (A2, K2), (A3, K3), (A4, K4), (B1, paired between two externally connectable input / output ports L1), (B2, L2), (B3, L3), (B4, L4), half of the four including the four original ports (A1 to A4) in the first row of the square lattice matrix switch Pair is the first I / O pair ((A1, K1), (A2, K2), (A3, K3), (A4, K4)), and the remaining four pairs constitute the second input / output pair group ((B1, L1), (B2, L2), (B3, L3), (B4, L4)).
The first input / output pair group ((A1, K1), (A2, K2), (A3, K3), (A4, K4)) and the second input / output pair group ((B1, L1), (B2, L2) ), (B 3, L 3), (B 4, L 4)) is arbitrary as an input pair group or an output pair group, but in the example shown in FIG. The output pair group ((A1, K1), (A2, K2), (A3, K3), (A4, K4)) is taken as the input pair group, and the second input / output pair group ((B1, L1), (B2, L2), (B3, L3), (B4, L4)) are set as an output pair group.

Thus, the input pair group ((A1, K1), (A2, K2), (A3, K3), (A4, K4)) and the output pair group ((B1, L1), (B2, L2), (B3 , L3), (B4, L4)) are set, the optical input device such as an optical fiber connected to the original ports (A1 to A4) of the input pair group is the first. Optical input means such as optical fiber connected to the idle ports (K1 to K4) of the input pair group as optical input means is used as the second optical input means and connected to the original ports (B1 to B4) of the output pair group The optical output means such as an optical fiber is the first optical output means, and the optical output means such as an optical fiber connected to the idle ports (L1 to L4) of the output pair group is the second optical output means.

The four first input / output sources E to H can be connected to any pair of first light input means (connected to any one of A1 to A4) and second light output means (connected to any of L1 to L4). The pair of first light input means and second light output means constitute a first input / output unit.
In FIG. 16, as an example, the first input / output source E is connected to the input port via the first optical input means (connected to any of A1 to A4) and the second optical output means (connected to any of L1 to L4). The first input / output source F is connected to the input port A2 and the output port L2, the first input / output source G is connected to the input port A3 and the output port L3, and the first input / output source is connected to the A1 and the output port L1. In the example, H is connected to the input port A4 and the output port L4.

The four second input / output sources K to N are connected to an arbitrary pair of second light input means (connected to any one of K1 to K4) and first light output means (connected to any of B1 to B4). The pair of second light input means and first light output means constitute a second input / output unit.
In FIG. 16, as an example, the second input / output source K is connected to the input port via the second optical input means (connected to any of K1 to K4) and the first optical output means (connected to any of B1 to B4). K1 and the output port B1, the second input / output source L is connected to the input port K2 and the output port B2, the second input / output source M is connected to the input port K3 and the output port B3, and the second input / output source is connected. In the example, N is connected to the input port K4 and the output port B4.
The input / output source includes a signal input / output source such as a signal input / output device such as a personal computer operated by an operator and a signal repeater disposed between the input / output device and the optical switch device. This is true.

Here, for the sake of explanation, it is assumed that one male user operates each of the first input / output sources E to H, and one female user operates each of the second input / output sources K to N. Then, as shown in FIG. 17, in the connection state in which the optical switches S12, S14, S42, and S44 are in the bar state and the remaining optical switches are in the cross state, A1, using the output port L1) and a female user of the second input / output source N (using the input port K4, output port B4), (2) a male user of the first input / output source F (input port A2, output port L2) And a female user of the second input / output source M (using the input port K3 and the output port B3), (3) a male user of the first input / output source G (using the input port A3 and the output port L3) and the first 2 Female user of input / output source L (input port K2 using output port B2), (4) male user of first input / output source H (using input port A4 and output port L4) and female user of second input / output source K (input port K1, output port B1) Are used for two-way connection via the optical switch device of the third embodiment, and a conversation or the like can be enjoyed by input (speaking) and output (listening).
Each bidirectional connection has (input → output) different from the input / output path of (A1 → B4), (A2 → B3), (A3 → B2), (A4 → B1), (Input → Output) is composed of two input / output paths including (K1 → L4), (K2 → L3), (K3 → L2), and (K4 → L1). Therefore, it is possible to reduce restrictions on usable light as compared to the case where the same input / output path is propagated oppositely to form a bidirectional connection. For example, an optical switch has an upper limit on the intensity of light that can be operated. However, in the case where a bidirectional connection is formed by two different input / output paths as compared with the case where the same input / output path is propagated in the opposite direction, 2 Double light intensity can be used.

Now, when the connection state of the square lattice matrix switch is switched to the bar state of the optical switches S22, S24, S32, S34 and the remaining optical switches to the cross state, as in FIG. (Input → Output) is (A1 → B1), (A2 → B2), (A3 → B3), (A4 → B4), and (Input → Output) is (K1 → L1), (K2 → L2) ), (K3 → L3), (K4 → L4) and two input / output paths, and (1) male user of the first input / output source E (input port A1, output port L1 is used) ) And a female user of the second input / output source K (using the input port K1 and output port B1), (2) a male user of the first input / output source F (using the input port A2 and output port L2) and the second input Female user of output source L (input port K2, output port B2 Use), (3) male user of first input / output source G (using input port A3 and output port L3) and female user of second input / output source M (using input port K3 and output port B3), (4 ) Four groups of male users of first input / output source H (using input port A4 and output port L4) and female users of second input / output source N (using input port K4 and output port B4) are in the third implementation. Two-way connection is made through the optical switch device of the form, and conversation can be enjoyed. That is, even if the connection state of the square lattice matrix switch is changed, there is no change in the pair relationship between the input pair and the output pair. As a result, the pair of input ports and output ports assigned to each user is changed. Therefore, a bidirectional connection in which input (speaking) and output (listening) are synchronized between one male user and one female user is realized.
In this bidirectional connection, all four of the optical switches S11 to S44 are set to the bar state and the remaining optical switches are set to the cross state. It can be realized in a street connection state (see FIGS. 7B, 7C, etc.).

<Fourth embodiment>
A fourth embodiment of the optical switch device will be described with reference to FIGS. The fourth embodiment relates to an embodiment in which the optical switch device is applied as the bidirectional optical switch using the rhombic lattice matrix switch. FIG. 18 is an explanatory diagram illustrating the configuration of the optical switch device according to the fourth embodiment, and FIG. 19 is an explanatory diagram illustrating the operation of the optical switch device according to the fourth embodiment.

As shown in FIG. 18, the optical switch according to the fourth embodiment is the same as the optical switch according to the third embodiment except that a rhombus lattice matrix switch is used instead of the square lattice matrix switch. It is set as the structure similar to the optical switch concerning.
That is, referring again to FIG. 10, on the basis of the above-mentioned regularity, external connection is possible in each input / output path of the matrix switch connected in a state where all the optical switches (S11 to S44) are switched to the cross state. Eight input / output port pairs (A1, K1), (A2, K2), (A3, K3), (A4, K4), (B1, L1), (B2) , L2), (B3, L3), and (B4, L4), half of the four pairs including the four original ports (A1 to A4) in the first row of the rhomboid matrix switch 1 input / output pair group ((A1, K1), (A2, K2), (A3, K3), (A4, K4)), and the remaining half of the four pairs are connected to the second input / output pair group (( B1, L1), (B2, L2), (B3 3) is set to (B4, L4)).
These first input / output pair groups ((A1, K1), (A2, K2), (A3, K3), (A4, K4)) are set, and the remaining four pairs are the second input / output pair groups. ((B1, L1), (B2, L2), (B3, L3), (B4, L4)) are in the same relationship as the optical switch device of the third embodiment, and the first light input means and the second light The connection relationship between the first input / output sources E to H and the second input / output sources K to N can be set via the input means, the first light output means, and the second light output means.
Therefore, of the optical switches S11 to S44, any four optical switches are set to the bar state, and the remaining optical switches are set to the cross state so that all four! Bidirectional connection in which the input and output are synchronized between the first input / output sources E to H and the second input / output sources K to N can be realized in the normal connection state.

First, the optical switch device according to the first embodiment and the second embodiment has been described as an application example to the polarization diversity optical switch. However, these optical switch devices constitute an input / output path. By changing the wiring, the wiring length can be made the same and the circuit scale can be further reduced. Hereinafter, description will be given with reference to the drawings.

First, a fifth embodiment of the optical switch device will be described with reference to FIGS. FIG. 20 is an explanatory diagram illustrating the configuration of the optical switch device according to the fifth embodiment, and FIG. 21 is an explanatory diagram illustrating the operation of the optical switch device according to the fifth embodiment.
In the fifth embodiment, the optical switch device according to the first embodiment (see FIGS. 12 and 13), input / output paths, input / output port pairs, first input / output pair groups, and second input / output pair groups are provided. By changing the wiring, etc. that make up the input / output path without changing the setting and the connection relationship between the input pair and the polarization separation means and the connection relationship between the output pair and the polarization coupling means, the circuit scale can be further increased. The circuit layout is made smaller and the circuit layout is made more compact. That is, any four optical switches are set to the bar state (for example, S12, S14, S42, S44 in FIG. 21), the remaining optical switches are set to the cross state, and the relationship between the input pair and the output pair is not changed. All four! (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs in the street connection state, and (B1, L1), (B2, L2), (B3, L3) , (B4, L4) as an output pair, the first polarization component and the second polarization component can be synchronized, which is the same as the optical switch device according to the first embodiment. Hereinafter, the changes will be described.

In the optical switch device according to the fifth embodiment, the wiring exiting from the Nth column (fourth column) to the outside of the matrix switch is folded back toward the first column in such a manner as to pass through the matrix switch, and the folded wiring end portion Is connected to the polarization separating means X1 to X4 and the polarization coupling means Y1 to Y4 arranged only on the first column side, the circuit scale is reduced and the circuit layout is made compact. That is, in the optical switch device according to the fifth embodiment, the optical switch device according to the first embodiment is simultaneously provided in the optical switch device according to the first embodiment with wiring arranged outside the matrix switch in the matrix switch. The arrangement destinations of the polarization separation means X1 to X4 and the polarization coupling means Y1 to Y4 that have selectivity in the arrangement destinations are grouped on the first column side, so that the circuit is more effective than the optical switch device according to the first embodiment. The scale is reduced and the circuit layout is made compact.
In addition, since the optical switch device according to the fifth embodiment is configured with the following regularity, the wiring length can be made the same and the polarization dependent loss can be reduced.

First, a square lattice matrix switch shown in FIG. 22 is assumed as a component of the optical switch device according to the fifth embodiment. FIG. 22 is a diagram showing a circuit configuration of a square lattice matrix switch constituting the optical switch device according to the fifth embodiment.
In this square lattice type matrix switch, each of the optical switches (S11 to S13) from the first column of the first row to the N-1 column (4-1 column = 3 columns) is replaced by one optical switch (S12 to S12). S14) and the optical switches (S22 to S24) in the next row and the optical switches (S41 to S4) from the first column of the Nth row (fourth row) to the N-1th column (4-1 column = 3 columns). S43) is connected to the optical switch (S42 to S44) in the Nth row (fourth row) and the optical switch (S32 to S34) in the previous row in the next column, and the second row to the N-1th row (4-1 row = 4th = The optical switches (S21 to S23 and S31 to S33) from the first column to the N-1 column (4-1 column = 3 columns) in the third row are the optical switches in the previous row (S12 to S14 and S22) in the next row. To S24) and the optical switches (S32 to S34 and S42 to S44) in the next row are connected. , The direction of the rows in all the rows are the parallel and the direction of the columns in the total column is a square lattice matrix switch are parallel.

Next, a square lattice wiring shown in FIG. 23 is assumed as a component of the optical switch device according to the fifth embodiment. FIG. 23 is a diagram illustrating a circuit configuration of a square lattice type wiring included in the optical switch device according to the fifth embodiment.
This square lattice type wiring is substantially the same size in the same row and column as the square lattice type matrix switch, and is connected by replacing all the optical switches of the square lattice type matrix switch with the connection in the cross state.
That is, the square lattice type wiring is substantially the same size in 4 rows and 4 columns as the square lattice type matrix switch, and all the optical switches (S11 to S44) of the square lattice type matrix switch are in the cross state. This is different from the square lattice type matrix switch in that it is connected with the connection (C11 to C44).

Next, as shown in FIG. 24, each cross-shaped connection (C11 to C44) is one in the same row and the same column with respect to each optical switch (S11 to S44) of the square lattice matrix switch in a plan view. In a state of being opposed to each other in the column direction so as to form a set, this square lattice type wiring is arranged on either the front or back surface of the square lattice type matrix switch. That is, either one of the square lattice type wiring and the square lattice type matrix switch, which are developed in a planar shape in the matrix direction, is arranged on the same plane in the previous state with respect to the other. FIG. 24 is an explanatory diagram (1) for explaining a state in which square lattice wirings are arranged on a square lattice matrix switch.

Next, as shown in FIG. 25, each set of optical switches (S14, S24, S34, S44) and cross-shaped connections (C14, C24, C34, C44) in the Nth row (fourth row) Cross connection (C14, C24, C34, C44) when the original ports (B1 to B4) of the optical switch (S14, S24, S34, S44) and the square lattice type wiring are regarded as the square lattice type matrix switch. Are connected to the ports (B1 to B4) corresponding to the original ports, and the idle ports (K1 to K4) of the optical switches (S14, S24, S34, S44) and the square lattice type wiring are connected to the square lattice type. A port (K1) corresponding to the idle port of the cross connection (C14, C24, C34, C44) when viewed as a matrix switch As K4) and is connected to the tetragonal lattice matrix switch and connecting the tetragonal lattice wires. FIG. 25 is an explanatory diagram (2) for explaining a state in which square lattice wirings are arranged on a square lattice matrix switch.

Next, the optical switches (S11, S21, S31, S41) of each pair (S11 and C11, S21 and C21, S31 and C31, S41 and C41) in the first row are cross-shaped. Connections (C11, C21, C31, C41) are when the original ports (A1 to A4) of the optical switch (S11, S21, S31, S41) and the square lattice type wiring are regarded as the square lattice type matrix switch. Ports (A1 to A4) corresponding to the original ports of the cross connection (C11, C21, C31, C41) are connected to the common polarization separation means (X1) via the first optical input means and the second optical input means. To X4), and the idle ports (L1 to L4) of the optical switches (S11, S21, S31, S41) and the square lattice type wiring are connected to the square lattice type matrix. The ports (L1 to L4) corresponding to the idle ports of the cross-like connection (C11, C21, C31, C41) when viewed as a switch are shared via the first light output means and the second light output means The polarization separation means (X1 to X4) and the polarization coupling means (Y1 to Y4) are arranged so as to be connected to the polarization coupling means (Y1 to Y4) (first row side), and Connect to the wiring.
The input / output relationship of light is arbitrary, and when the original ports (A1 to A4) of the optical switch (S11, S21, S31, S41) and the square lattice type wiring are regarded as the square lattice type matrix switch Polarization coupling common to the ports (A1 to A4) corresponding to the original ports of the cross-shaped connections (C11, C21, C31, C41) via the first light output means and the second light output means Cross when the idle ports (L1 to L4) of the optical switches (S11, S21, S31, and S41) and the square lattice type wiring are regarded as the square lattice type matrix switch connected to the means (Y1 to Y4) Ports (L1 to L4) corresponding to the idle ports of the C-shaped connections (C11, C21, C31, C41) and the first optical input means and the May be modified so as to be connected to a common polarization separating means via the second optical input means (X1 ~ X4).
By providing the following regularity, the optical switch device according to the fifth embodiment having a small polarization dependent loss can be configured (see FIG. 20). A specific description will be given below.

In the optical switch device according to the fifth embodiment, input / output paths are arranged on an optical circuit board such as the board 100 (see FIG. 20). In this input / output path, the length of the wiring (for example, the optical waveguide) is the same, and the loss due to the propagation of the optical signal proportional to the wiring length is equal. In addition, an intersection, which is a place where wirings straddle, always occurs. At the intersection, optical signal loss occurs.
However, since the optical switch device according to the fifth embodiment is configured with the regularity, all of the eight input / output paths arbitrarily formed on the substrate 100 by setting the optical switch in the bar state. In each case, the number of times of passing through the intersection is 20 times.
Therefore, in the optical switch device according to the fifth embodiment, there is no difference between the optical signals transmitted through the eight input / output paths, and the loss does not depend on the path, and the polarization dependent loss can be reduced. .
When the outside of the substrate 100 is included, the number of intersections in the eight input / output paths differs by a maximum of two times, but the number of intersections outside the substrate 100 is sufficiently smaller than the number of intersections on the substrate 100. Therefore, it can be substantially ignored as the loss is small.
Further, in the illustrated example, a part of the wiring constituting the input / output path is extended outward from the substrate 100, and the polarization separating means X1 to X4 and the polarization coupling means Y1 to Y4 existing outside the substrate 100, Although connected, the polarization separating means X1 to X4, the polarization coupling means Y1 to Y4, and the wirings leading to these means may be arranged on the substrate 100.

In the optical switch device according to the fifth embodiment, when wiring is provided on the substrate 100, in addition to downsizing the circuit scale, the length of the wiring is the same and the number of intersections between the wirings is substantially reduced. By aiming at the same, the purpose is to reduce the difference in loss caused by the loss of the optical signal and reduce the polarization dependent loss, but this can also be realized by the following modification.
FIG. 26 shows a modification of the optical switch device according to the fifth embodiment.
This modified example relates to a matrix portion that is separated into two upper and lower layers so that the two upper and lower layers can be moved back and forth at a point portion indicated by a black circle.
That is, in this modified example, the wiring length is the same between the upper and lower layers, and the number of intersections in the planes constituting each layer can be reduced. Loss can be reduced.
As long as the upper and lower layers are separated, it is arbitrary which of the square lattice type matrix switch and the square lattice type wiring is used as an upper layer or a lower layer.

Next, as the optical switch device according to the sixth embodiment, the circuit scale can be further reduced by changing the wiring that constitutes the input / output path of the optical switch device (diamond-lattice matrix switch) according to the second embodiment. A configuration in which the circuit layout is made compact will be described with reference to FIGS. FIG. 27 is an explanatory diagram illustrating the configuration of the optical switch device according to the sixth embodiment, and FIG. 28 is an explanatory diagram illustrating the operation of the optical switch device according to the sixth embodiment.

In the sixth embodiment, the optical switch device (see FIGS. 14 and 15) according to the second embodiment and each of the input / output path, the pair of input / output ports, the first input / output pair group, and the second input / output pair group. By changing the wiring, etc. that make up the input / output path without changing the setting and the connection relationship between the input pair and the polarization separation means and the connection relationship between the output pair and the polarization coupling means, the circuit scale can be further increased. The circuit layout is made smaller and the circuit layout is made more compact. That is, any four optical switches are set to the bar state and the remaining optical switches are set to the cross state, and the relationship between the input pair and the output pair is not changed, and all four! (A1, K1), (A2, K2), (A3, K3), (A4, K4) are input pairs in the street connection state, and (B1, L1), (B2, L2), (B3, L3) , (B4, L4) as an output pair, the first polarization component and the second polarization component can be synchronized, which is the same as the optical switch device according to the second embodiment. The changes will be described below.

In the optical switch device according to the sixth embodiment, as shown in FIGS. 27 and 28, the wiring that goes out of the matrix switch from the Nth column (fourth column) passes through the matrix switch and is directed to the first column. By connecting the folded wiring end to the polarization separation means X1 to X4 and the polarization coupling means Y1 to Y4 arranged only on the first row side, the circuit scale is reduced and the circuit layout is compact. It is going to become. That is, in the optical switch device according to the sixth embodiment, the optical switch device according to the second embodiment is provided at the same time as the wiring arranged outside the matrix switch is arranged in the matrix switch in the optical switch device according to the second embodiment. The arrangement destinations of the polarization separating means X1 to X4 and the polarization coupling means Y1 to Y4 that have selectivity in the arrangement destinations are grouped on the first column side, so that they are not polarization independent as in the second embodiment. However, the circuit scale is smaller and the circuit layout is more compact than the optical switch device according to the second embodiment. In addition, the code | symbol 200 in FIG. 28 shows a board | substrate.

S11 to S44 Optical switch A1 to A4, K1 to K4 Input port (original port)
B1 to B4, L1 to L4 Output port (original port)
*

Idle port

100, 200 board

Claims

2 input 2 switchable optical switch in one of two states: cross and bar output is disposed two N in a matrix of N rows and N columns where N is an integer of 2 or more, a square lattice matrix switch and rhombic lattice A matrix switch having a circuit configuration of any one of the matrix switches;
An original port that constitutes one of two externally connectable input / output ports in each input / output path of the matrix switch that is connected in a state where all the optical switches of the matrix switch are switched to the cross state, and the other Of the 2N input / output port pairs to be paired with the idle port constituting the first half, the N number of the pairs including the N original ports in the first column of the matrix switch in the pair is the first. When the input / output pair group is used and the remaining half of the N pairs are used as the second input / output pair group,
N first optical input means connected one-to-one with the original ports in either the first input / output pair group or the second input / output pair group;
N first optical output means connected one-to-one with the unconnected original ports in any one of the first input / output pair group and the second input / output pair group;
N second optical input means connected in a one-to-one relationship with each of the idle ports including the original port connected to the first optical input means in the pair;
N second optical output means connected in a one-to-one relationship with the unconnected idle ports including the original port connected to the first optical output means in the pair;
An optical switch device comprising:
The optical switch device according to claim 1, wherein the matrix switch has a circuit configuration of a square lattice type matrix switch.
Further, the light is polarized into a first polarization component and a second polarization component, the first polarization component is input to the first light input means, and the second polarization component is input to the second light input means. N polarization splitting means input to
N polarization coupling means for polarization-coupling the first polarization component and the second polarization component output one by one from the first light output means and the second light output means,
The optical switch device according to claim 1, comprising:
A polarization splitter that splits light into a first polarization component and a second polarization component; and a polarization axis of one of the first polarization component and the second polarization component; A first polarization rotating element that rotates around the other polarization axis;
An original polarization axis before rotation of any one polarization axis of the first polarization component and the second polarization component whose polarization coupling means has rotated the polarization axis by the first polarization rotation element A second polarization rotator to be rotated again, and one of the first polarization component and the second polarization component whose polarization axis is re-rotated by the second polarization rotator and the other. The optical switch device according to claim 3, further comprising: a beam combiner that performs wave coupling.
In the square lattice type matrix switch, each optical switch from the first column of the first row to the N−1 column is connected to the optical switch of the first row and the optical switch of the next row in the next column, and the first column of the N row From the second row to the (N-1) th column, the optical switches from the first row to the (N-1) th column are connected to the optical switch in the Nth row and the optical switch in the previous row. In the next row, the optical switches are connected to the optical switch in the previous row and the optical switch in the next row, the row directions in all rows are parallel, and the column directions in all columns are parallel. A square lattice matrix switch,
A square lattice-type wiring that is connected in the same row and in the same column as the square lattice-type matrix switch, and that is connected by replacing all the optical switches of the square lattice-type matrix switch with a cross-state connection. In the state in which the individual cross-shaped connections are arranged opposite to each other in the column direction so as to form one set with respect to the individual optical switches of the square lattice type matrix switch, Arranged on either side of the square lattice matrix switch
Each set of the optical switch and the cross-shaped connection in the N-th column is the cross-shaped connection when the original port of the optical switch and the square lattice type wiring are regarded as the square lattice type matrix switch. A port corresponding to the original port, and a port corresponding to the idle port of the cross-like connection when the idle port of the optical switch and the square lattice type wiring are regarded as the square lattice type matrix switch And are connected,
Each set of the optical switch and the cross-shaped connection in the first row is the cross-shaped connection when the original port of the optical switch and the square lattice type wiring are regarded as the square lattice type matrix switch. A port corresponding to the original port is connected to the common polarization separation means via the first optical input means and the second optical input means, and the idle port of the optical switch and the square lattice type wiring are connected to the square lattice A port corresponding to the idle port of the cross connection when viewed as a type matrix switch is connected to a common polarization coupling means via the first optical output means and the second optical output means Or, the optical input / output relationship is reversed, and the original port of the optical switch and the square lattice type wiring are connected to the square lattice type matrix switch. And the port corresponding to the original port of the cross-like connection when connected to the common polarization coupling means via the first light output means and the second light output means, and the light The idle port of the switch and the port corresponding to the idle port of the cross-like connection when the square lattice type wiring is regarded as the square lattice type matrix switch are the first optical input unit and the second optical input unit. The optical switch device according to any one of claims 3 to 4, wherein the optical switch device is connected to a common polarization separation means via a base.
The pair of first light input means and second light output means are N first input / output units connectable to the N first input / output sources, and the pair of second light input means and first light output means are The optical switch device according to claim 1, wherein N second input / output units connectable to the N second input / output sources.
2 input 2 switchable optical switch in one of two states: cross and bar output is disposed two N in a matrix of N rows and N columns where N is an integer of 2 or more, a square lattice matrix switch and rhombic lattice External connection is possible in each input / output path of the matrix switch that is connected in a state in which all the optical switches of the matrix switch are switched to the cross state with respect to the matrix switch having a circuit configuration of the matrix switch. Of the 2N input / output port pairs paired with the original port constituting one of the two input / output ports and the idle port constituting the other, the N originals in the first column of the matrix switch Half of the N pairs including ports in the pair are set as the first input / output pair group, and the remaining half A method for designing an optical switch device comprising the step of setting the N number of pairs as a second input / output pair group.