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WO2018179497A1 - Procédé de migration de dispositif côté station, dispositif côté station, procédé de commande de transfert de dispositif côté station et système de communication optique - Google Patents

Procédé de migration de dispositif côté station, dispositif côté station, procédé de commande de transfert de dispositif côté station et système de communication optique Download PDF

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Publication number
WO2018179497A1
WO2018179497A1 PCT/JP2017/032852 JP2017032852W WO2018179497A1 WO 2018179497 A1 WO2018179497 A1 WO 2018179497A1 JP 2017032852 W JP2017032852 W JP 2017032852W WO 2018179497 A1 WO2018179497 A1 WO 2018179497A1
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WIPO (PCT)
Prior art keywords
wavelength
side device
signal
optical
wavelength band
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PCT/JP2017/032852
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English (en)
Japanese (ja)
Inventor
船田　知之
大助 梅田
成斗 田中
Original Assignee
住友電気工業株式会社
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Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority to JP2019508519A priority Critical patent/JP6900997B2/ja
Publication of WO2018179497A1 publication Critical patent/WO2018179497A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/03—WDM arrangements
    • H04J14/0307—Multiplexers; Demultiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks

Definitions

  • the present invention relates to a station side device migration method, a station side device, a station side device transmission control method, and an optical communication system.
  • optical communication having a transmission capacity of 100 Gbps has been proposed.
  • 100 G-EPON Ethernet (registered trademark) Passive Optical Network
  • 25 Gbps 25.8 Gbps
  • these four optical signals are multiplexed according to a wavelength division multiplexing (WDM) system. Wavelength multiplexed light is transmitted through an optical fiber.
  • WDM wavelength division multiplexing
  • Patent Document 1 discloses an optical transceiver in which four optical devices each having a transmission rate of 10 Gbps are integrated.
  • the optical transceiver multiplexes four optical signals having different wavelengths from each other, and equivalently realizes transmission speeds of 40 Gbps and 100 Gbps.
  • a migration method for a station-side device for an optical communication system wherein an uplink signal having a wavelength included in a first wavelength band for a first transmission rate is received by a reception unit of the station-side device. And configuring at least one of the first wavelength band and the second wavelength band included in the second wavelength band for a transmission rate different from the first transmission rate.
  • the transmission unit of the station side device can transmit the downlink signal using one wavelength
  • the reception unit can receive the uplink signal
  • the reflected return light of the downlink signal can be attenuated by the wavelength filter in front of the reception unit In this way, a step of configuring the station side device is provided.
  • a station apparatus includes a receiving unit configured to be able to receive an uplink signal having a wavelength included in a first wavelength band for a first transmission rate, and a first wavelength band
  • a transmitting unit configured to transmit a downlink signal using at least one wavelength included in the second wavelength band having a transmission rate different from the first transmission rate and overlapping at least part of the first transmission rate;
  • a wavelength filter that is provided in the preceding stage and attenuates the reflected return light that returns to the reception unit of the downstream signal.
  • the station side apparatus transmission control method includes a step of receiving an uplink signal having a wavelength included in the first wavelength band for the first transmission rate by the receiving unit of the station side apparatus; A downlink signal using at least one wavelength included in the second wavelength band for a transmission speed different from the first transmission speed and overlapping at least a part of the first wavelength band is transmitted by the transmitter of the station side device A step of transmitting, and a step of attenuating the reflected return light of the downstream signal by a wavelength filter provided in a preceding stage of the receiving unit.
  • An optical communication system includes a first home-side device configured to transmit an uplink signal having a wavelength included in a first wavelength band for a first transmission rate, A second signal configured to receive a downlink signal having at least one wavelength included in a second wavelength band that overlaps at least a part of the first wavelength band and is different from the first transmission speed.
  • the station-side device includes a receiving unit configured to receive an upstream signal, a transmitting unit configured to transmit a downstream signal, and reflected return light that is provided upstream of the receiving unit and returns to the downstream signal receiving unit. And a wavelength filter for attenuating.
  • a migration method for a station-side device for an optical communication system wherein an uplink signal having a wavelength included in a first wavelength band for a first transmission rate is received by a reception unit of the station-side device.
  • the transmission unit of the station side device using the at least one wavelength included in the second wavelength band for a transmission rate different from the first transmission rate.
  • a station side device migration method for an optical communication system is a station side device migration method including an optical transceiver including a transmission unit, the method being for a first transmission rate.
  • the transmission unit can transmit the downlink signal using at least one wavelength included in the wavelength band of the signal
  • the reception unit can receive the uplink signal
  • the reflected return light of the downlink signal is the wavelength at the preceding stage of the reception unit.
  • Configuring the station side device so that it can be attenuated by the filter, and exchanging the optical transceiver to change the number of wavelengths used for the downlink signal.
  • a migration method for a station-side device for an optical communication system wherein an uplink signal having a wavelength included in a first wavelength band for a first transmission rate is received by a reception unit of the station-side device.
  • the second wavelength band for the transmission speed different from the first transmission speed overlapping with at least a part of the receivable wavelength band of the receiving unit.
  • the transmitting unit of the station side device can transmit the downlink signal using at least one wavelength
  • the receiving unit can receive the uplink signal
  • the reflected return light of the downlink signal is transmitted by the wavelength filter in the front stage of the receiving unit. Configuring the station-side device to be attenuated, and replacing the wavelength filter with a wavelength filter having a shorter cutoff wavelength.
  • a station side device migration method for an optical communication system is a station side device migration method including an optical transceiver including a transmission unit, the method being for a first transmission rate.
  • a step of configuring the station-side device so that an upstream signal having a wavelength included in the first wavelength band of the first side can be received by the receiving unit of the station-side device, and overlapping at least a part of the receivable wavelength band of the receiving unit, And the transmission unit can transmit the downlink signal using at least one wavelength included in the second wavelength band for the transmission rate different from the first transmission rate, and the reception unit can receive the uplink signal
  • the step of configuring the station side apparatus and the optical transceiver are exchanged so that the reflected return light of the downstream signal can be attenuated by the wavelength filter in the front stage of the receiving unit, and used for the downstream signal. And a step of changing the number of that wavelength.
  • FIG. 1 is a diagram illustrating a configuration example of an optical communication system according to an embodiment.
  • FIG. 2 is a schematic diagram for explaining one example of wavelength arrangement of GE-PON, 10G-EPON, and 100G-EPON.
  • FIG. 3 is a diagram illustrating a configuration example of a station-side apparatus capable of coexisting 10G-EPON and 100G-EPON.
  • FIG. 4 is a schematic diagram for explaining reception of an uplink signal by the station side apparatus shown in FIG.
  • FIG. 5 is a diagram showing another configuration example of the station side apparatus capable of coexisting 10G-EPON and 100G-EPON.
  • FIG. 6 is a schematic diagram for explaining reception of an uplink signal by the station side device shown in FIG. FIG.
  • FIG. 7 is a diagram showing one study example of a station side device for coexistence of GE-PON, 10G-EPON, and 100G-EPON.
  • FIG. 8 is a diagram showing another examination example of a station side device for coexistence of GE-PON, 10G-EPON, 25G, 50G, and 100G-EPON.
  • FIG. 9 is a diagram showing still another example of examination of a station side device for coexistence of GE-PON, 10G-EPON, 25G, 50G, and 100G-EPON.
  • FIG. 10 is a diagram for explaining reception of an uplink signal by the station-side apparatus illustrated in FIGS. 7 to 9.
  • FIG. 11 is a diagram illustrating a configuration for solving the problem of an increase in branch loss in the configuration illustrated in FIGS.
  • FIG. 12 is a diagram illustrating an example of the allocation of the wavelength of the uplink signal for each ODN in the configuration illustrated in FIG.
  • FIG. 13 is a diagram for explaining problems in the configuration of the station-side device shown in FIG.
  • FIG. 14 is a diagram showing the relationship between the wavelength and the RMS spectral width mask according to the upstream wavelength specification of 1000BASE-PX10, which is one of the standards of IEEE802.3.
  • FIG. 15 is a schematic diagram for explaining the spectrum of an FP-LD (Fabry-Perot type semiconductor laser) light source for 1000BASE-PX10.
  • FIG. 12 is a diagram illustrating an example of the allocation of the wavelength of the uplink signal for each ODN in the configuration illustrated in FIG.
  • FIG. 13 is a diagram for explaining problems in the configuration of the station-side device shown in FIG.
  • FIG. 14 is a diagram showing the relationship between the wavelength and the RMS spectral width mask according to the upstream wavelength specification of 1000BASE-PX10, which is one of
  • FIG. 16 is a diagram showing the relationship between the wavelength and the RMS spectral width mask according to the 1000BASE-PX20 (20 km) upstream wavelength specification, which is one of the standards of IEEE 802.3.
  • FIG. 17 is a schematic diagram for explaining the spectrum of a single longitudinal mode oscillation type DFB-LD.
  • FIG. 18 is a diagram illustrating an example of an actual specification range of an uplink transmitter applied to GE-PON (1000BASE-PX10).
  • FIG. 19 is a schematic diagram illustrating the characteristics of a wavelength filter for cutting reflected return light having a 100 G downstream wavelength.
  • FIG. 20 is a diagram showing a schematic configuration of one example of a station-side apparatus according to an embodiment of the present invention.
  • FIG. 21 is a diagram for explaining an example of the migration scenario of the station side device.
  • FIG. 22 is a schematic diagram illustrating an example of a wavelength arrangement of the GE-PON upstream wavelength and the 100GE-EPON downstream reflected reflected light at the stage (Day 3) when 100G-EPON is mounted.
  • FIG. 23 is a schematic configuration diagram of an optical communication system in a stage (Day 0) where GE-PON and 10G-EPON coexist.
  • FIG. 24 is a schematic configuration diagram of an optical communication system in a stage (Day 1) in which GE-PON, 10G-EPON, and 25G-EPON coexist.
  • FIG. 25 is a schematic configuration diagram of an optical communication system in a stage (Day 2) in which GE-PON, 10G-EPON, 25G-EPON, and 50G-EPON coexist.
  • FIG. 26 is a schematic configuration diagram of an optical communication system configuration in a stage (Day 3) in which 10G-EPON, 25G-EPON, 50G-EPON, and 100G-EPON coexist.
  • FIG. 27 is a diagram for explaining the overall configuration of the optical communication system according to the embodiment of the present invention.
  • FIG. 28 is a schematic diagram for explaining another example of wavelength arrangement of GE-PON, 10G-EPON, and 100G-EPON.
  • FIG. 29 is a diagram illustrating another example of the migration scenario of the station side device.
  • FIG. 30 is a diagram showing a schematic configuration of another example of the station side apparatus according to the embodiment of the present invention.
  • An object of the present disclosure is to enable coexistence of optical communications even when wavelength bands overlap between optical communications having different transmission capacities. [Effects of the present disclosure] Based on the above, even when wavelength bands overlap between optical communications having different transmission capacities, the optical communications can be made coexistent.
  • a station side apparatus migration method for an optical communication system transmits an uplink signal having a wavelength included in a first wavelength band for a first transmission rate to a station side apparatus. And the step of configuring the station-side device so that it can be received by the receiver, and included in the second wavelength band that overlaps at least a part of the first wavelength band and has a transmission rate different from the first transmission rate.
  • the transmission unit of the station side device can transmit the downlink signal using the at least one wavelength that is transmitted, the reception unit can receive the uplink signal, and the reflected light of the downlink signal is the wavelength filter in the previous stage of the reception unit Configuring the station side device so as to be attenuated by.
  • the optical communications can be made coexistent.
  • the step of configuring the station-side device so that the transmission unit of the station-side device can transmit a downlink signal using at least one wavelength includes the transmission unit having one wavelength within the second wavelength band.
  • the step of configuring the station side device so that the downlink signal can be transmitted using, and the configuration of the station side device so that the transmission unit can transmit the downlink signal using two or more wavelengths within the second wavelength band Steps.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • the transmission unit can multiplex all of a plurality of predetermined wavelengths in the second wavelength band and transmit the downstream signal, and the reception unit can transmit the upstream signal. And a step of configuring the station side device so that the reflected return light can be attenuated by the wavelength filter.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • the method further includes the step of replacing the wavelength filter with a wavelength filter having a shorter cutoff wavelength.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • the station side device includes an optical transceiver including at least a transmission unit.
  • the station side apparatus migration method further includes the step of changing the number of wavelengths used for the downlink signal by exchanging the optical transceiver.
  • a station apparatus includes a receiving unit configured to be able to receive an uplink signal having a wavelength included in a first wavelength band for a first transmission rate, A transmission unit configured to transmit a downlink signal using at least one wavelength included in a second wavelength band that overlaps at least a part of the wavelength band and is different from the first transmission rate; A wavelength filter that is provided upstream of the reception unit and attenuates reflected return light that returns to the reception unit of the downstream signal.
  • the transmission unit is configured to transmit a downlink signal using one wavelength in the second wavelength band.
  • the transmission unit is configured to transmit a downlink signal using two or more wavelengths within the second wavelength band.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • the transmission unit is configured to be able to transmit a downlink signal by multiplexing all of a plurality of predetermined wavelengths in the second wavelength band.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • the reception unit of the station side apparatus receives an uplink signal having a wavelength included in the first wavelength band for the first transmission rate. And a downlink signal using at least one wavelength included in the second wavelength band, which overlaps at least a part of the first wavelength band and is different from the first transmission speed, in the second wavelength band.
  • the transmitting step includes a step in which the transmitting unit transmits a downlink signal using one wavelength within the second wavelength band.
  • the transmitting step includes a step in which the transmitting unit transmits a downlink signal using a plurality of wavelengths within the second wavelength band.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • the transmitting step includes a step in which the transmitting unit multiplexes all of a plurality of predetermined wavelengths in the second wavelength band and transmits a downlink signal.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • An optical communication system is configured to transmit an uplink signal having a wavelength included in a first wavelength band for a first transmission rate. And a downlink signal having at least one wavelength included in the second wavelength band for a transmission speed different from the first transmission speed and overlapping at least a part of the first wavelength band.
  • the station-side device includes a receiving unit configured to receive an upstream signal, a transmitting unit configured to transmit a downstream signal, and reflected return light that is provided upstream of the receiving unit and returns to the downstream signal receiving unit. And a wavelength filter for attenuating.
  • the optical communications can be made coexistent.
  • the transmission unit is configured to transmit a downlink signal using one wavelength within the second wavelength band.
  • the optical communications can be made coexistent.
  • the transmission unit is configured to transmit a downlink signal using two or more wavelengths within the second wavelength band.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • the transmission unit is configured to be able to transmit a downlink signal by multiplexing all of a plurality of predetermined wavelengths in the second wavelength band.
  • optical communication using the first wavelength band and optical communication using the second wavelength band can coexist. Can do.
  • the first home side apparatus includes a Fabry-Perot type semiconductor laser as a light source for transmitting an upstream signal.
  • the reflected light can be weakened by the wavelength filter while reducing the attenuation of the upstream signal by the wavelength filter in the station side device.
  • the first home apparatus includes a single longitudinal mode distributed feedback semiconductor laser as a light source for transmitting an upstream signal.
  • the reflected light can be weakened by the wavelength filter while reducing the attenuation of the upstream signal by the wavelength filter in the station side device.
  • a station side apparatus migration method for an optical communication system transmits an uplink signal having a wavelength included in a first wavelength band for a first transmission rate to a station side apparatus. And a step of configuring the station-side device so that it can be received by the receiver, and transmission by the station-side device using at least one wavelength included in the second wavelength band for a transmission rate different from the first transmission rate.
  • the station side device is configured so that the transmission unit can transmit the downlink signal, the reception unit can receive the uplink signal, and the reflected return light of the downlink signal can be attenuated by the wavelength filter in the preceding stage of the reception unit And replacing the wavelength filter with a wavelength filter having a shorter cutoff wavelength.
  • a migration method for a station-side device for an optical communication system is a migration method for a station-side device including an optical transceiver including a transmission unit, and the method includes the first transmission.
  • the transmission unit can transmit a downstream signal using at least one wavelength included in the second wavelength band of the first signal, the upstream signal can be received by the reception unit, and the reflected return light of the downstream signal is transmitted from the reception unit. It comprises the steps of configuring the station side device so that it can be attenuated by the preceding wavelength filter, and changing the number of wavelengths used for the downlink signal by exchanging the optical transceiver.
  • a station side apparatus migration method for an optical communication system transmits an uplink signal having a wavelength included in a first wavelength band for a first transmission rate to a station side apparatus. And a second wavelength band for a transmission rate that overlaps at least a part of the receivable wavelength band of the reception unit and that is different from the first transmission rate.
  • the transmission unit of the station side device can transmit the downlink signal using at least one wavelength included in the signal, the uplink signal can be received by the reception unit, and the reflected return light of the downlink signal is transmitted to the upstream of the reception unit. Configuring the station-side device to be attenuated by the wavelength filter, and replacing the wavelength filter with a wavelength filter having a shorter cutoff wavelength.
  • a migration method for a station-side device for an optical communication system is a migration method for a station-side device including an optical transceiver including a transmission unit, and the method includes a first transmission.
  • the station-side device Configuring the station-side device so that an uplink signal having a wavelength included in the first wavelength band for speed can be received by the receiving unit of the station-side device, and at least a part of the receivable wavelength band of the receiving unit
  • the transmission unit can transmit a downlink signal using at least one wavelength included in the second wavelength band for a transmission rate different from the first transmission rate, and the reception unit can receive an uplink signal
  • the step of configuring the station side device so that the reflected return light of the downstream signal can be attenuated by the wavelength filter in the front stage of the receiving unit, and the optical transceiver And a step of changing the number of wavelengths needed.
  • Gbps may be simply expressed as “G” for simplification.
  • 1 Gbps, 10 Gbps, and 100 Gbps may be represented as “1G”, “10G”, and “100G”, respectively, in the following description.
  • FIG. 1 is a diagram illustrating a configuration example of an optical communication system according to an embodiment.
  • a PON (Passive Optical Network) system 300 is an optical communication system according to an embodiment.
  • the PON system 300 includes a station side device 301, a home side device 302, a PON line 303, and an optical splitter 304.
  • the “station-side device” and “home-side device” can be realized by “OLT (Optical Line Terminal)” and “ONU (Optical Network Unit)”.
  • the station-side device 301 is installed in, for example, a communication company's office.
  • the station side device 301 mounts a host substrate (not shown).
  • an optical transceiver (not shown) that converts electrical signals and optical signals into each other.
  • the home device 302 is installed on the user side. Each of the plurality of home side devices 302 is connected to the station side device 301 via the PON line 303.
  • the PON line 303 is an optical communication line composed of an optical fiber.
  • the PON line 303 includes a trunk optical fiber 305 and at least one branch optical fiber 306.
  • the optical splitter 304 is connected to the trunk optical fiber 305 and the branch optical fiber 306.
  • a plurality of home devices 302 can be connected to the PON line 303.
  • the optical signal transmitted from the station side device 301 passes through the PON line 303 and is branched to a plurality of home side devices 302 by the optical splitter 304.
  • the optical signal transmitted from each home apparatus 302 is focused by the optical splitter 304 and sent to the station apparatus 301 through the PON line 303.
  • the optical splitter 304 passively branches or multiplexes the signal from the input signal without requiring any external power supply.
  • a wavelength-multiplexed PON system in which a plurality of wavelengths are assigned to an upstream signal or a downstream signal and a plurality of wavelengths are wavelength-multiplexed to form an upstream signal or a downstream signal has been studied.
  • a wavelength of 25 Gbps to a signal having a transmission capacity of 25 Gbps per wavelength for upstream and downstream and multiplex them.
  • a gradual expansion (upgrade) of transmission capacity can be considered.
  • FIG. 2 is a schematic diagram for explaining one example of wavelength arrangement of GE-PON, 10G-EPON, and 100G-EPON.
  • the wavelength band assigned to the upstream (US) is 1260-1360 nm (1290-1330 nm in the Reduced specification), and the wavelength band assigned to the downstream (DS) is 1480-1500 nm.
  • the wavelength band assigned to the upstream is 1260-1280 nm
  • the wavelength band assigned to the downstream is 1575-1580 nm.
  • Standardization is in progress for wavelengths used in 100G-EPON.
  • four wavelengths ⁇ t1 to ⁇ t4 used for 25 Gbps transmission are arranged in the wavelength band of 1285 to 1310 nm.
  • four wavelengths ⁇ r1 to ⁇ r4 each used for 25 Gbps transmission are arranged in the wavelength band of 1335 to 1360 nm. Therefore, according to the wavelength arrangement shown in FIG. 2, the downstream wavelength band of 100G-EPON overlaps at least a part (the longer wavelength side) of the upstream wavelength band of GE-PON.
  • the upstream wavelength band and downstream wavelength band of 100G-EPON do not overlap either the upstream wavelength band or downstream wavelength band of 10G-EPON. Therefore, 10G-EPON and 100G-EPON can coexist.
  • FIG. 3 is a diagram showing a configuration example of a station-side device capable of coexisting 10G-EPON and 100G-EPON.
  • FIG. 4 is a schematic diagram for explaining reception of an uplink signal by the station side apparatus shown in FIG.
  • the station side device 301 includes an optical transceiver 141 and an electric processing LSI 43.
  • the optical transceiver 141 supports lanes of 10 Gbps ⁇ 1 and 25 Gbps ⁇ 1.
  • the optical transceiver 141 includes an optical wavelength demultiplexer (MUX / DMUX) 42, an electrical processing LSI 43, optical transmitters 51 and 56, and optical receivers 61 and 66.
  • MUX / DMUX optical wavelength demultiplexer
  • the optical wavelength demultiplexer 42 is connected to the PON line 303.
  • the optical wavelength multiplexer / demultiplexer 42 is mounted on the optical transceiver 141 in order to transmit a plurality of optical signals having different wavelengths on the PON line 303.
  • the optical wavelength demultiplexer 42 multiplexes the optical signal having the wavelength ⁇ t0 and the optical signal having the wavelength ⁇ t1 and outputs the wavelength multiplexed signal to the PON line 303.
  • the optical wavelength demultiplexer 42 receives the wavelength multiplexed signal from the PON line 303 and separates the wavelength multiplexed signal into two optical signals (wavelengths ⁇ r0 and ⁇ r1).
  • the optical transmitter 56 receives an electrical signal from the electrical processing LSI 43 and converts the electrical signal into an optical signal having a wavelength ⁇ t0.
  • the optical transmitter 51 receives an electrical signal from the electrical processing LSI 43 and converts the electrical signal into an optical signal having a wavelength ⁇ t1.
  • the optical signal with wavelength ⁇ t0 is a 10G downstream signal
  • the optical signal with wavelength ⁇ t1 is a 25G downstream signal.
  • the optical receiver 66 receives the optical signal having the wavelength ⁇ r0 from the PON line 303 through the optical wavelength demultiplexer 42 and converts the optical signal into an electrical signal.
  • the optical receiving unit 66 outputs the electrical signal to the electrical processing LSI 43.
  • the optical receiver 61 receives the optical signal having the wavelength ⁇ r1 from the PON line 303 through the optical wavelength demultiplexer 42 and converts the optical signal into an electrical signal.
  • the optical receiver 61 outputs the electrical signal to the electrical processing LSI 43.
  • the optical signal with wavelength ⁇ r0 is a 10G downstream signal
  • the optical signal with wavelength ⁇ r1 is a 25G downstream signal.
  • the electrical processing LSI 43 performs various processes on the electrical signal output from the optical transceiver 141. On the other hand, the electrical processing LSI 43 generates an electrical signal to be input to the optical transceiver 141.
  • the electrical processing LSI 43 can support multilane distribution control.
  • the electrical processing LSI 43 can realize 100 Gbps transmission by four lanes of 25 Gbps. By changing the number of lanes, the electrical processing LSI 43 can support transmission speeds of 25 Gbps, 50 Gbps, and 100 Gbps.
  • the optical signal having the wavelength ⁇ r0 and the optical signal having the wavelength ⁇ r1 coexist in the PON line 303 by the wavelength division multiplexing (WDM) method.
  • the optical signal with wavelength ⁇ r0 and the optical signal with wavelength ⁇ r1 can be separated in the station side device 301 by the optical wavelength demultiplexer 42 (see FIG. 3). Therefore, these optical signals can overlap in time.
  • FIG. 5 is a diagram showing another configuration example of the station side apparatus capable of coexisting 10G-EPON and 100G-EPON.
  • FIG. 6 is a schematic diagram for explaining reception of an uplink signal by the station side device shown in FIG.
  • optical transceiver 141A is different from optical transceiver 141 shown in FIG. 3 in that optical receiver 141A includes optical receivers 61A (Rx0 & Rx1) instead of optical receivers 61 and 66.
  • the optical receiver 61A can be realized by a dual rate optical receiver circuit.
  • Various known configurations can be applied to the configuration of the optical receiver 61A.
  • the optical signal having the wavelength ⁇ r0 and the optical signal having the wavelength ⁇ r1 coexist in the PON line 303 by time division multiplexing (TDM).
  • TDM time division multiplexing
  • the optical receiver 61A receives the optical signal with the wavelength ⁇ r0 and the optical signal with the wavelength ⁇ r1 that are time-division multiplexed.
  • the optical receiver 61A separates the received signal into a 10G upstream signal and a 25G upstream signal.
  • 10G-EPON and 100G-EPON can coexist by WDM regarding downstream. Further, 10G-EPON and 100G-EPON can coexist in WDM or TDM with respect to uplink. However, as shown in FIG. 2, the upstream wavelength band of 100GE-PON and the downstream wavelength band overlap with the upstream wavelength band of GE-PON. For this reason, it is necessary to examine the configuration of the station side device in which GE-PON and 100G-EPON can coexist.
  • FIG. 7 is a diagram showing one study example of a station side device for coexistence of GE-PON, 10G-EPON, and 100G-EPON.
  • the optical transmission / reception unit 131 includes an optical transmission unit 21, an optical reception unit 31, and an optical wavelength multiplexer / demultiplexer 44 in addition to the elements shown in FIG. 3.
  • the optical transmission / reception unit 131 may be realized by a combination of a 10G / 25G optical transceiver and a 1G optical transceiver, or may be realized by a single optical transceiver.
  • the optical wavelength demultiplexer 42 and the optical wavelength demultiplexer 44 are connected to the optical fiber transmission line 310 via an optical splitter 307 (1 ⁇ 2 optical splitter).
  • the optical fiber transmission line 310 is connected to ODNs (Optical Distribution Network) 311 to 314 through an optical splitter 308 (4 ⁇ 1 optical splitter).
  • ODNs Optical Distribution Network
  • the optical transmission unit 21 receives the 1G downstream signal from the electrical processing LSI 43 and transmits the downstream signal as an optical signal having the wavelength ⁇ t0 ′.
  • the optical receiver 31 receives an upstream signal from a home device (not shown) via the optical fiber transmission line 310 and the optical splitter 308.
  • the optical signal having the wavelength ⁇ t0 ′ is a 1G downstream signal. Accordingly, the receivable wavelength band of the optical receiver 31 includes the upstream (US) band (1260 nm-1360 nm) of GE-PON.
  • the optical transceiver 131 is configured with a 1G optical transceiver and a 25G / 50G / 100G optical transceiver.
  • the optical splitter 307 is an essential component.
  • FIG. 8 is a diagram showing another examination example of a station side device for coexistence of GE-PON, 10G-EPON, 25G, 50G, and 100G-EPON.
  • the optical transceiver 131 includes an optical transmitter 21, an optical receiver 31, and an optical wavelength demultiplexer 44 in addition to the configuration shown in FIG. The following description will not be repeated for elements common to the elements shown in FIG.
  • FIG. 9 is a diagram showing still another examination example of a station side device for coexistence of GE-PON, 10G-EPON, 25G, 50G, and 100G-EPON.
  • the optical transmission / reception unit 131 includes an optical reception unit 31 ⁇ / b> A instead of the optical reception unit 31.
  • the optical receiver 31A is an optical receiver that supports dual rates (1G, 10G).
  • the 10G downstream signal (wavelength ⁇ t0) from the optical transmitter 56 is sent to the optical wavelength demultiplexer 44. Further, the optical receiver 66 is omitted.
  • FIG. 10 is a diagram for explaining the reception of the uplink signal by the station side apparatus shown in FIGS.
  • a 1G upstream signal (wavelength ⁇ r0 '), a 10G upstream signal (wavelength ⁇ r0), and a 25G upstream signal (wavelength ⁇ r1) are time-division multiplexed.
  • the electrical processing LSI 43 collectively manages the transmission timing of the upstream signal from each home device. Specifically, the electrical processing LSI 43 gives an upstream signal transmission permission to each home-side apparatus.
  • the 10G upstream signal and the 25G upstream signal may coexist by WDM.
  • the 1G upstream wavelength band includes a 10G upstream wavelength band and a 100G upstream wavelength band. Accordingly, the optical wavelength demultiplexer 44 shown in FIGS. 7 to 9 cannot separate the 1G upstream signal from the 10G upstream signal or the 100G upstream signal.
  • the optical receiver 31 is configured to be able to receive light in the 1G upstream wavelength range.
  • the optical receiver 31 receives not only the 1G upstream signal but also the 10G upstream signal and the 100G upstream signal. Since the reception electrical band of the optical receiver 31 is about 1 GHz, the optical receiver 31 can correctly reproduce the 1G upstream signal, but cannot correctly reproduce the 10G upstream signal and the 100G upstream signal. Therefore, the electrical processing LSI 43 can recognize only the 1G upstream signal among the signals transmitted from the optical receiver 31.
  • FIG. 11 is a diagram showing a configuration for solving the problem of an increase in branch loss in the configuration shown in FIGS.
  • the optical wavelength demultiplexer 42 and the optical wavelength demultiplexer 44 of the station side device 301 are connected to an optical splitter 309 (4 ⁇ 2 splitter) on the ODN.
  • the optical splitters 307 and 308 shown in FIG. 9 are integrated into the optical splitter 309.
  • the optical splitter 309 is an essential component. .
  • the branching loss due to the optical splitter 309 is about the same as the branching loss (for example, about 6 to 7 dB) of the optical splitter 308 shown in FIG. According to the configuration shown in FIG. 11, since the optical splitter 307 does not exist, no branching loss due to the optical splitter 307 occurs.
  • FIG. 12 is a diagram showing an example of the allocation of the wavelength of the uplink signal for each ODN in the configuration shown in FIG. As shown in FIG. 12, since time-division multiplexed uplink signals are transmitted, it is possible to reduce the influence of overlapping between the 1G upstream wavelength band, the 10G upstream wavelength band, and the 100G upstream wavelength band.
  • FIG. 13 is a diagram for explaining a problem in the configuration of the station-side device shown in FIG. As shown in FIG. 13, for example, reflected return light of a 100G downstream signal is generated. The wavelength of the reflected return light is included in the wavelength band of the 1G upstream signal. Since the downstream signal is continuous light, the reflected return light of the downstream signal necessarily becomes an interference wave.
  • IEEE 802.3 stipulates that the level of reflected return light (Optical return loss of ODN) of GE-PON and 10G-EPON is 20 dB min. If a 100G-EPON downstream signal (4 wavelengths) of up to +10 dBm per wave is attenuated by 26 dB due to the loss of the branching splitter (6 dB in the round trip) + 20 dB of reflection at the ODN, the reflected return light of 4 wavelengths of -16 dBm is reflected. Return to the station side device 301. The reflected return light passes through the optical wavelength demultiplexer 44 and enters the optical receiver 31A.
  • a receiver for receiving an upstream signal of GE-PON needs to normally receive light of about -30 dBm.
  • the optical receiver 31A must satisfy this specification. Considering the high sensitivity of the optical receiving unit 31A as described above, the reflected return light is converted into a wavelength filter so that the intensity of the reflected return light of the 100G downstream signal is sufficiently reduced before being input to the optical receiving unit 31A. It is necessary to attenuate with.
  • a filter for attenuating a 100 G downstream signal by about 30 dB is disposed in the front stage of the optical receiver 31 A or the front stage of the optical wavelength demultiplexer 44.
  • the attenuated reflected return light is sufficiently smaller than the 1G upstream signal received by the optical receiver 31A.
  • the upstream wavelength of GE-PON (1260-1360 nm) and the downstream wavelength of 100G-EPON (there are four wavelengths at 1335-1360 nm) are in the same wavelength region.
  • the reflected return light of the 100 G downstream signal can be attenuated by the wavelength filter, there is a problem that the reflected return light and the 1 G upstream signal cannot be separated by the optical wavelength demultiplexer 44.
  • IEEE 802.3 which is a standard related to GE-PON, assumes that a multi-longitudinal mode oscillation type optical transmitter such as FP-LD (Fabry-Perot type semiconductor laser) is used for an upstream transmitter.
  • FP-LD Fabry-Perot type semiconductor laser
  • the RMS (root mean square) spectral width has a great influence on transmission characteristics. For this reason, the multi-longitudinal mode oscillation type optical transmitter is required to have a narrower RMS spectral width as the oscillation wavelength of the transmitter becomes farther from the zero dispersion wavelength (about 1310 nm) of the optical fiber.
  • FIG. 14 is a diagram showing the relationship between the wavelength and the RMS spectral width mask according to the upstream wavelength specification of 1000BASE-PX10, which is one of the standards of IEEE802.3.
  • FIG. 15 is a schematic diagram for explaining the spectrum of an FP-LD (Fabry-Perot type semiconductor laser) light source for 1000BASE-PX10.
  • FP-LD Fabry-Perot type semiconductor laser
  • FP-LD is generally used for multi-longitudinal mode oscillation type optical transmitters.
  • the RMS spectrum width of the FP-LD of the multi-longitudinal mode oscillation type optical transmitter is about 1.5 to 3 nm.
  • the temperature change of the center wavelength is large in the FP-LD. In the example shown in FIG. 15, the temperature change of the center wavelength of the FP-LD is about 40 nm. Therefore, the upstream transmitter using the FP-LD light source can satisfy the mask specification of 1000BASE-PX10 shown in FIG.
  • FIG. 16 is a diagram showing the relationship between the wavelength and the RMS spectral width mask according to the 1000BASE-PX20 (20 km) upstream wavelength specification, which is one of the standards of IEEE 802.3.
  • the width of the allowable RMS spectrum is smaller than that in 1000BASE-PX10.
  • FP-LD it is difficult to satisfy the mask specification of 1000BASE-PX20.
  • an upstream transmitter using a single longitudinal mode oscillation type DFB-LD (distributed feedback semiconductor laser) element is generally used.
  • FIG. 17 is a schematic diagram for explaining the spectrum of a single longitudinal mode oscillation type DFB-LD.
  • the single longitudinal mode oscillation type DFB-LD has the characteristics that the RMS spectral width is smaller than that of the FP-LD and the temperature change of the center wavelength is small.
  • the temperature change of the center wavelength of the DFB-LD is about 7 nm.
  • the DFB-LD it is possible to achieve an upstream wavelength in a band of 1290 nm to 1330 nm, which is sufficiently narrow with respect to the specification of 1260 nm to 1360 nm in IEEE.
  • the upstream wavelength specification is defined as a wavelength band of 1260-1360 nm. Since the wavelength band of the 100G downstream signal overlaps a part of the wavelength band of the 1G upstream signal (long wavelength side band), the 1G upstream signal and the reflected return light of the 100G downstream signal are separated by the optical wavelength demultiplexer. Is difficult.
  • the upstream wavelength is defined and operated in a band slightly narrower than the band of FP-LD, such as 1290-1330 nm. There are many cases.
  • the 1 G upstream wavelength band is shorter than the 100 G downstream wavelength band. Although located on the side, unlike the case of FP-LD, it is far from the band of the 100G downstream wavelength. Therefore, the reflected return light of the 100G downstream signal and the 1G upstream signal can be separated by the optical wavelength demultiplexer.
  • the upstream wavelength specification is defined within the wavelength band of 1260-1360 nm.
  • FIG. 18 is a diagram showing an example of an actual specification range of an uplink transmitter applied to GE-PON (1000BASE-PX10).
  • the specification range of the center wavelength is 1260-1360 nm.
  • the specification range of the center wavelength of the actual optical transceiver is defined to be, for example, 1270 nm or more and 1350 nm or less in consideration of the RMS spectrum width of the FP-LD.
  • the RMS spectrum width of FP-LD is generally about 2 nm to 3 nm.
  • the center wavelength is 1350 nm and the RMS spectral width is 3 nm, 68% of the optical output power falls within the range of 1347-1353 nm, and 95% of the optical output power falls within the range of 1343-1356 nm.
  • FIG. 19 is a schematic diagram illustrating the characteristics of a wavelength filter for cutting reflected return light having a 100 G downstream wavelength.
  • FIG. 20 is a diagram showing a schematic configuration of one example of a station-side apparatus according to an embodiment of the present invention.
  • the station side device 301 includes optical transceivers 151A and 151B.
  • the optical transceiver 151A is an optical transceiver for 25G / 50G / 100G-EPON, and includes an optical wavelength multiplexer / demultiplexer 42, an optical transmitter 51 (Tx1), and an optical receiver 61 (Rx1).
  • the optical transceiver 151B is an optical transceiver for 1G and 10G, and includes an optical wavelength demultiplexer 44, an optical transmitter 21 (Tx0 '), and an optical receiver 31A (Rx0). The following description will not be repeated for the same elements as those shown in FIG.
  • a wavelength filter 71 for attenuating reflected return light having a wavelength of 100 G downstream is disposed in front of the optical wavelength demultiplexer 44.
  • the wavelength filter 71 has a characteristic of attenuating light having an upstream wavelength of 1353 nm or less and light having a downstream wavelength of 1490 nm to 1580 nm while attenuating light having an upstream wavelength of 1357 nm or more and 1360 nm or less.
  • the wavelength filter 71 receives the reflected return light of one wavelength ( ⁇ t1) of the 100G downstream signal while receiving the upstream signal of the GE-PON with a slight filter loss (for example, about 0.5 dB) even in the worst case. Can be cut.
  • the wavelength filter 71 having the above pass band, the reflected light of the signal having the wavelengths ⁇ t2, ⁇ t3, and ⁇ t4 among the 100G downstream signals cannot be cut by the wavelength filter 71. Therefore, in this embodiment, with the migration of the station-side device 301, the wavelength filter is replaced, and the reflected return light of the signal having the wavelengths ⁇ t2, ⁇ t3, and ⁇ t4 is cut. As the steps progress from Day 0 to Day 3, the number of wavelengths used for the 100G downlink signal increases, so the wavelength band of the 100G downlink signal widens and more overlaps with the wavelength band of the 1G uplink signal. In this embodiment, the wavelength filter 71 is replaced with a wavelength filter capable of attenuating the reflected return light of the 100 G downstream signal in such a case.
  • FIG. 21 is a diagram for explaining an example of the migration scenario of the station side device. 20 and 21, GE-PON (1000BASE-PX10), GE-PON (1000BASE-PX20), and 10G-EPON are mounted in the Day 0 stage. That is, GE-PON and 10G-EPON coexist. At this stage, it is not necessary to provide a wavelength filter for cutting the reflected return light of the 100G downstream signal in the station side device.
  • 25G-EPON is mounted, and GE-PON, 10G-EPON and 25G-EPON coexist. 50G-EPON and 100G-EPON have not been installed or are not in operation.
  • the upstream wavelength light of 1353 nm or less and the downstream wavelength light of 1490 nm to 1580 nm are passed, while the upstream wavelength light of 1357 nm to 1360 nm is attenuated.
  • the wavelength filter to be provided is provided on the reception side of the 1G upstream signal of the station side device (the front stage of the optical wavelength demultiplexer 44).
  • the wavelength arrangement of downstream signals in 50G-EPON is 1359 ⁇ 1 nm and 1349 ⁇ 1 nm.
  • the wavelength filter used in the Day 1 stage is replaced with a wavelength filter having a shorter cutoff wavelength.
  • a wavelength filter 71 that passes light having an upstream wavelength of 1330 nm or less and light having a downstream wavelength of 1490 nm to 1580 nm while attenuating light having an upstream wavelength of 1335 nm to 1360 nm is a 1G upstream signal of the station side device.
  • the receiving side the front stage of the optical wavelength demultiplexer 44.
  • the transmitter of the station side device 301 uses the more wavelengths (wavelengths ⁇ d1 and ⁇ d2 shown in FIG. 21) included in the 100G-EPON downstream wavelength band as compared to the Day1 stage.
  • the wavelength filter used in the Day 1 stage is not only the reflected return light of the 25 G downstream signal (downstream signal of the wavelength ⁇ d1) in the Day1 stage, but also the added downstream signal (downstream of the wavelength ⁇ d2). In order to attenuate the reflected return light of the signal), it is replaced with a wavelength filter having a shorter cutoff wavelength.
  • 100G-EPON is mounted, and GE-PON, 10G-EPON, 25G-EPON, 50G-EPON and 100G-EPON coexist.
  • the wavelength arrangement of downstream signals in 100G-EPON is 1359 ⁇ 1 nm, 1349 ⁇ 1 nm, 1344 ⁇ 1 nm, and 1339 ⁇ 1 nm.
  • the light of the upstream wavelength of 1330 nm or less and the light of the downstream wavelength of 1490 nm to 1580 nm are passed, while 1335 nm or more and 1360 nm or less
  • the wavelength filter 71 for attenuating the upstream wavelength light is provided on the receiving side of the 1G upstream signal of the station side device (the front stage of the optical wavelength demultiplexer 44).
  • FIG. 22 is a schematic diagram illustrating an example of the wavelength arrangement of the GE-PON upstream wavelength and the 100GE-EPON downstream return reflected light at the stage where the 100G-EPON is mounted (Day 3).
  • the home device of GE-PON conforms to 1000BASE-PX20. That is, this home-side apparatus has a single longitudinal mode oscillation type DFB-LD element as a light source for transmitting an upstream signal. Even when the temperature change of the center wavelength is taken into consideration, the upstream wavelength of the GE-PON can be sufficiently separated from the wavelength of the reflected return light of the downstream signal of 100 G-EPON to the short wavelength side.
  • the wavelength filter can not only pass the upstream signal of the GE-PON with a small loss, but can cut the reflected return light of the downstream signal of the 100 G-EPON.
  • FIG. 23 is a schematic configuration diagram of an optical communication system at a stage (Day 0) where GE-PON and 10G-EPON coexist.
  • An optical transceiver 151, electrical processing LSIs 2A and 2B, and an upstream bandwidth allocation control LSI 3 are mounted on the host substrate 1A.
  • the optical transceiver 151 can support both 1 Gbps (wavelength ⁇ 0 ′) and 10 Gbps (wavelength ⁇ 0) transmission capacities.
  • the electric processing LSI 2A supports one lane (10 Gbps ⁇ 1) of 10 Gbps.
  • the electrical processing LSI 2A receives a 10G upstream signal from the optical transceiver 151 and outputs a 10G downstream signal to the optical transceiver 151.
  • the electric processing LSI 2B supports one lane of 1 Gbps (1 Gbps ⁇ 1).
  • the electrical processing LSI 2B receives the 1G upstream signal from the optical transceiver 151 and outputs the 1G downstream signal to the optical transceiver 151.
  • Each of the electrical processing LSIs 2A and 2B is configured to be able to communicate with the outside of the host substrate 1A.
  • the uplink bandwidth allocation control LSI 3 executes control for allocating the bandwidth of the uplink signal transmitted by each of the plurality of home side devices 302.
  • FIG. 24 is a schematic configuration diagram of an optical communication system at a stage (Day 1) in which GE-PON, 10G-EPON, and 25G-EPON coexist.
  • Day 1 stage the home side apparatus 302 corresponding to 25 Gbps is introduced into the optical communication system.
  • the host substrate 1A may be replaced with a host substrate 1B.
  • an optical transceiver 161, electrical processing LSIs 2, 2A, 2B, and an upstream bandwidth allocation control LSI 3 are mounted on the host substrate 1B.
  • the optical transceiver 161 can support 1 Gbps (wavelength ⁇ 0 ′), 10 Gbps (wavelength ⁇ 0), and 25 Gbps (wavelength ⁇ 1).
  • a plurality of optical transceivers supporting a single wavelength or a plurality of wavelengths may be employed in place of the optical transceiver 161.
  • the electric processing LSI 2 supports 4 lanes of 25 Gbps (25 Gbps ⁇ 4).
  • the electrical processing LSI 2 receives a 25 G upstream signal from the optical transceiver 141 and transmits a 25 G downstream signal to the optical transceiver 141.
  • FIG. 25 is a schematic configuration diagram of an optical communication system at a stage (Day 2) in which GE-PON, 10G-EPON, 25G-EPON and 50G-EPON coexist.
  • a home side device 302 corresponding to 50 Gbps is introduced into the optical communication system.
  • the optical transceiver 161 (see FIG. 24) is replaced with the optical transceiver 171.
  • the optical transceiver 171 is an optical transceiver of 1 Gbps (wavelength ⁇ 0 ′), 10 Gbps (wavelength ⁇ 0), and 25 Gbps ⁇ 2 wavelengths (wavelengths ⁇ 1 and ⁇ 2).
  • a plurality of optical transceivers supporting a single wavelength or a plurality of wavelengths may be employed instead of the optical transceiver 171.
  • FIG. 26 is a schematic configuration diagram of an optical communication system configuration in a stage (Day 3) in which 10G-EPON, 25G-EPON, 50G-EPON and 100G-EPON coexist.
  • the optical transceiver 171 (see FIG. 25) is replaced with the optical transceiver 181.
  • the optical transceiver 181 is an optical transceiver of 1 Gbps (wavelength ⁇ 0 ′), 10 Gbps (wavelength ⁇ 0), and 25 Gbps ⁇ 4 wavelengths (wavelengths ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4).
  • a plurality of optical transceivers supporting a single wavelength or a plurality of wavelengths may be employed instead of the optical transceiver 181.
  • FIG. 27 is a diagram for explaining the overall configuration of the optical communication system according to the embodiment of the present invention.
  • a home apparatus is connected to each of the ODNs 311 to 314 via an optical splitter.
  • ODN 311 representatively shows home devices 302a, 302b, 302c, and 302d connected via an optical splitter 315 (4 ⁇ 1 optical splitter).
  • the home-side device 302a is a home-side device compliant with GE-PON (1000BASE-PX10), and includes a WDM filter 81a, an optical transmission unit 82a, and an optical reception unit 83a.
  • the WDM filter 81a is a filter for separating a GE-PON upstream signal (wavelength of 1260-1360 nm) and a GE-PON downstream signal (wavelength of 1480-1500 nm).
  • the optical transmitter 82a includes a semiconductor laser (LD) 84a as a light source.
  • the semiconductor laser 84a is an FP-LD.
  • the optical receiver 83a includes a photodiode (PD) 86a as a light receiving element.
  • PD photodiode
  • the home device 302b is a home device compliant with GE-PON (1000BASE-PX20), and includes a WDM filter 81b, an optical transmitter 82b, and an optical receiver 83b. Similar to the WDM filter 81a, the WDM filter 81b is a filter for separating the GE-PON upstream signal (wavelength of 1260-1360 nm) and the GE-PON downstream signal (wavelength of 1480-1500 nm).
  • the optical transmitter 82b includes a semiconductor laser 84b and an isolator 85b.
  • the semiconductor laser 84b is a DFB-LD.
  • the optical receiver 83b includes a photodiode 86b.
  • the home side device 302c is a home side device compliant with 10G-EPON, and includes a WDM filter 81c, an optical transmission unit 82c, and an optical reception unit 83c.
  • the WDM filter 81c is a filter for separating a 10G-EPON upstream signal (wavelength of 1260-1280 nm) and a 10G-EPON downstream signal (wavelength of 1575-1580 nm).
  • the optical transmitter 82c includes a semiconductor laser 84c and an isolator 85c.
  • the semiconductor laser 84c is a DFB-LD.
  • the light receiving unit 83c includes a photodiode 86c.
  • the home side device 302d is a home side device compliant with 25G-EPON, and includes a WDM filter 81d, an optical transmission unit 82d, and an optical reception unit 83d.
  • the WDM filter 81d is a filter for separating a 25G-EPON upstream signal (wavelength of 1287 to 1290 nm) and a 25G-EPON downstream signal (wavelength of 1357 to 1360 nm).
  • the optical transmitter 82d includes a semiconductor laser 84d and an isolator 85d.
  • the semiconductor laser 84d is a DFB-LD.
  • the optical receiver 83d includes a photodiode 86d.
  • Uplink signals transmitted from each of the home side devices 302 a to 302 d are reflected by the ODN 311.
  • the reflected return light of the upstream signal (attenuated by 20 dB or more) is input to each of the home side devices 302a, 302b, 302c, and 302d.
  • a downlink signal (attenuated by 15 dB to 29 dB in the ODN) having a transmission rate different from the transmission rate of the home device is input to each home device as interference light.
  • the WDM filter 81a can cut the reflected return light from the ODN 311 of the 25G downstream signal and the 25G upstream signal.
  • reflected return light from the ODN 311 of the 25G downstream signal and the 25G upstream signal is incident.
  • the FP-LD transmitter has high resistance to reflected return light. Due to the reflection return light resistance of the semiconductor laser 84a, the influence of the return light to the semiconductor laser 84a can be reduced without an isolator.
  • the WDM filter (WDM filters 81b and 81c) can cut the 25G downstream signal and the reflected return light from the ODN 311 of the 25G upstream signal.
  • the isolator (85b and 85c) can cut the reflected return light from the ODN 311 of the 25G downstream signal and the 25G upstream signal.
  • a 1G downlink signal and a 10G downlink signal are input to the home device 302d. These downstream signals are cut by the WDM filter 81d. Therefore, the influence of the 1G downlink signal and the 10G downlink signal can be avoided on both the reception side and the transmission side of the home side apparatus 302d.
  • the reflected return light from each ODN 311 of the 1G upstream signal and the 10G upstream signal is input to the home-side apparatus 302d.
  • the reflected return light can be cut by the WDM filter 81d.
  • the reflected return light can be cut by the isolator 85d. Therefore, the influence of the reflected return light from the ODN 311 of the 1G upstream signal and the 10G upstream signal can be avoided on both the reception side and the transmission side of the home side apparatus 302d.
  • the station side device 301 includes optical transceivers 151A and 151B.
  • the optical transceiver 151 ⁇ / b> A includes optical transmitters 51 and 56 and an optical receiver 61.
  • the optical transmitter 51 includes a semiconductor laser 51a and an isolator 51b.
  • the optical transmitter 56 includes a semiconductor laser 56a and an isolator 56b.
  • the optical receiver 61 includes a photodiode 61a.
  • the optical transceiver 151B includes an optical transmitter 21 and an optical receiver 32.
  • the optical transmitter 21 includes a semiconductor laser 21a and an isolator 21b.
  • the optical receiver 32 includes a photodiode 32a.
  • the optical receiver 32 is an optical receiver that supports dual rates (1G, 10G). That is, the receivable wavelength band of the optical receiver 31A includes the 1G upstream wavelength band (1260 nm-1360 nm). This wavelength band includes a 10G upstream wavelength band and a 100G upstream wavelength band.
  • DFB-LD is used for all of the semiconductor lasers 51a, 56a, and 21a that are light sources.
  • the reflected light of the upstream signal and the downstream signal from the station side device 301 is reflected to the semiconductor laser (51 a, 56 a, 21 a) by the isolator (51 b, 56 b, 21 b). Input can be prevented.
  • the optical wavelength demultiplexer 42 passes only the 25G upstream signal out of the input optical signal and the input reflected return light to the optical receiver 61. Further, uplink signals from the home side devices 302a to 302d are time-division multiplexed. Therefore, the reception of the 25G upstream signal by the optical receiver 61 can be prevented from being affected by the upstream signal of other transmission rates and the reflected return light.
  • a wavelength filter 71 is provided in the preceding stage of the optical wavelength demultiplexer 44.
  • the reflected light of the 25G downstream signal is cut by the wavelength filter 71.
  • the optical wavelength demultiplexer 44 passes only the upstream optical signal out of the upstream optical signal, the 1G downstream reflected reflected light, and the 10G downstream reflected reflected light input from the ODN side, to the optical receiver 32. Further, uplink signals from the home side devices 302a to 302d are time-division multiplexed. Therefore, the reception of the 1G upstream signal and the 10G upstream signal by the optical receiver 32 can be prevented from being affected by the reflected return light of the 25G upstream signal and the downstream signal from the station side device 301.
  • FIG. 28 is a schematic diagram for explaining another example of wavelength arrangement of GE-PON, 10G-EPON, and 100G-EPON.
  • 100 GE-PON upstream three wavelengths ( ⁇ r2, ⁇ r3, ⁇ r4) for transmission of 25 Gbps are arranged in the wavelength band of 1285-1310 nm, and one wavelength is the same wavelength as the upstream wavelength band of 10G-EPON.
  • the wavelength arrangement shown in FIG. 28 is different from the wavelength arrangement shown in FIG.
  • the embodiment of the present invention can also be applied to the case of the wavelength arrangement shown in FIG.
  • FIG. 29 is a diagram illustrating another example of the migration scenario of the station side device. Referring to FIG. 29, 10G-EPON is not introduced in Day 0. In this respect, the scenario shown in FIG. 29 is different from the scenario shown in FIG.
  • FIG. 30 is a diagram showing a schematic configuration of another example of the station side apparatus according to the embodiment of the present invention.
  • the optical transceiver 131 includes an optical transceiver 151C and an optical transceiver 151D.
  • the optical transceiver 151C is a 25G / 50G / 100G optical transceiver, and includes an optical wavelength multiplexer / demultiplexer 42, an optical transmitter 51, an optical transmitter 56, and an optical receiver 61.
  • the optical transceiver 151D is a 1G optical transceiver, and includes an optical wavelength demultiplexer 44, an optical transmitter 21, and an optical receiver 31.
  • an optical transmitter 56 for transmitting a 10G downstream signal (wavelength ⁇ t0) and an optical transmitter 51 for transmitting a 25G downstream signal (wavelength ⁇ t0) are coupled to the optical wavelength demultiplexer 42.
  • the optical receiver 61 can receive an uplink signal at a dual rate of 25 Gbps and 10 Gbps.

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Abstract

L'invention concerne un procédé de migration pour un dispositif côté station pour un système de communication optique, ledit procédé comprenant : une étape consistant à former un dispositif côté station de manière à pouvoir recevoir dans une unité de réception un signal de liaison montante ayant une longueur d'onde comprise dans une première bande de longueur d'onde, et une étape consistant à former un dispositif côté station de façon à pouvoir utiliser au moins une longueur d'onde incluse dans une seconde bande de longueur d'onde chevauchant au moins une partie de la première bande de longueur d'onde pour transmettre un signal de liaison descendante, et pouvoir recevoir un signal de liaison montante au moyen d'une unité de réception, et pouvoir atténuer la lumière de retour réfléchie du signal de liaison descendante au moyen d'un filtre de longueur d'onde au niveau d'un étage avant l'unité de réception.
PCT/JP2017/032852 2017-03-29 2017-09-12 Procédé de migration de dispositif côté station, dispositif côté station, procédé de commande de transfert de dispositif côté station et système de communication optique WO2018179497A1 (fr)

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Publication number Priority date Publication date Assignee Title
JPWO2021181588A1 (fr) * 2020-03-12 2021-09-16
WO2021181588A1 (fr) * 2020-03-12 2021-09-16 日本電信電話株式会社 Dispositif de diagnostic et procédé de diagnostic
JP7452626B2 (ja) 2020-03-12 2024-03-19 日本電信電話株式会社 診断装置及び診断方法

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