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WO2000022765A1 - Reseau en anneau optique unidirectionnel - Google Patents

Reseau en anneau optique unidirectionnel Download PDF

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Publication number
WO2000022765A1
WO2000022765A1 PCT/DE1999/003303 DE9903303W WO0022765A1 WO 2000022765 A1 WO2000022765 A1 WO 2000022765A1 DE 9903303 W DE9903303 W DE 9903303W WO 0022765 A1 WO0022765 A1 WO 0022765A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
ring network
coupling device
transmission
data signals
Prior art date
Application number
PCT/DE1999/003303
Other languages
German (de)
English (en)
Other versions
WO2000022765B1 (fr
Inventor
Wilhelm-Martin Plotz
Michael Lehdorfer
Kuno Zhuber-Okrog
Martin Schreiblehner
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP99900055A priority Critical patent/EP1121777A1/fr
Priority to JP2000576569A priority patent/JP2002527990A/ja
Publication of WO2000022765A1 publication Critical patent/WO2000022765A1/fr
Publication of WO2000022765B1 publication Critical patent/WO2000022765B1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0283—WDM ring architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0204—Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems
    • H04J14/0289—Optical multiplex section protection
    • H04J14/0291—Shared protection at the optical multiplex section (1:1, n:m)

Definitions

  • the invention relates to an optical unidirectional ring ⁇ network according to the preamble of claim 1.
  • Ring networks are known for the transmission of large amounts of data, in which data are transmitted unidirectionally or — usually via two fibers — bidirectionally between different network nodes / terminals.
  • the branching and insertion of data should take place on the optical level and it should be possible to reconfigure easily.
  • the ring network including the network nodes should also be implemented as cost-effectively as possible.
  • Such a ring network is specified in claim 1.
  • a unidirectional ring network is particularly cost-effective since only one fiber is required for transmission and that Network nodes can be easily formed.
  • the fixed assignment of a specific transmission channel or a wavelength, which is used only once in the ring network, to a network node provides a clear assignment of transmission channels and thus the transmitted data signals to the network nodes. Since each network node receives the data signals from all other network nodes, it is possible to establish any connection to other network nodes by selecting an appropriate reception filter. If a switchable or tunable receive filter is selected, any connection between all network nodes can be made. Multiple filters also enable simultaneous connection to multiple network nodes.
  • a second ring can be provided for equivalent circuits, in which the data transmission takes place in the opposite direction.
  • FIG. 1 shows a unidirectional ring network
  • FIG. 2 shows a first exemplary embodiment of a network node
  • FIG. 3 shows a preferred exemplary embodiment of this network node
  • Figure 4 shows a unidirectional ring network with a replacement transmission ring.
  • FIG. 1 shows a unidirectional ring network with a plurality of network nodes NA, NB, NC, ..., NN.
  • the transmission between any network node takes place in wavelength multiplex operation over an optical fiber 1 in several transmission channels.
  • channel ⁇ A to ⁇ N which have a predetermined wavelength distance from each other.
  • the direction of transmission is indicated by arrows.
  • the network node NA is shown in FIG. 2 as a basic circuit diagram.
  • Network nodes are used to implement different connections, which are always made via transmission channels.
  • Data signals to be decoupled in the network node are referred to as “drops” to be branched off, and the data signals to be sent out as “to be inserted” (add).
  • add There is also talk of branching off, switching through or inserting channels, in the narrower sense meaning the signals transmitted in these channels.
  • Reference symbols with the same indices are used for the transmission channels and the associated data signals.
  • a data signal ⁇ A is transmitted in the associated transmission channel ⁇ B.
  • the network node which is reduced to the essential functions of an add-drop module, contains the series connection of an amplifier 4, a decoupling device 5 and a coupling device 6.
  • At input 2 there is a wavelength multiplex signal of all data signals ⁇ A received via transmission channels ⁇ A - ⁇ N - ⁇ N on.
  • a single signal can be transmitted in each transmission channel (transmission band) or several individual signals in wavelength division multiplex operation or of course also in time division multiplex operation.
  • the received signals are initially amplified and then arrive at the decoupling device 5.
  • a 1: 2 coupler (branching device)
  • All data signals / transmission channels are first divided into two signal paths. All transmission signals / transmission channels to be switched are switched through via a signal path except for the transmission channel ⁇ A assigned to this network node;
  • the transmission channel ⁇ be diverted dr0p will lected by here as a wavelength switch decoupling se ⁇ .
  • the wavelength crossover is shown schematically here as a coupler 51 with a fixed, switchable or tunable bandpass filter 52 and a bandstop filter 53.
  • the channel ⁇ D R0P is the only one in the passband of the bandpass filter 52. It is routed, for example, participants device via a drop-output 7 to a part ⁇ .
  • a corresponding data signal ⁇ A , ADD present at the add input 8 is inserted into the assigned transmission channel in the coupling device 6 designed as a coupler.
  • the bandstop 53 located in the first signal path is provided, which is tuned to the corresponding wavelength.
  • the transmission of this signal can also be interrupted in the previous network node MN, but this is associated with additional configuration effort if additional network nodes are added.
  • a wavelength multiplex signal is output, which contains the signals of all transmission channels ⁇ A / A D D and ⁇ B to ⁇ N.
  • each network node can receive the corresponding transmit signal of every other network node, i. H. a corresponding connection can be established. This makes it easy to change the configuration.
  • FIG. 3 shows a particularly advantageous variant of a network node. It is a tunable band pass 54 is provided, and as a coupling device 61, 62 a provided with a grating 62 coupler 61.
  • the ker of the Verstär ⁇ 4 coming wavelength division multiplexed signal includes the data signal ⁇ A, which has already passed through the entire ring network (loop return signal). This is reflected by the grating 62, which acts as a bandstop, and destroyed in an optical sump 63 (a suitable termination of an optical fiber).
  • the first opposite to the transmission ⁇ direction of the ring network in the coupler injected signal ⁇ A, ADD is also reflected by the grating, thereby further sent in the direction of transmission.
  • Different structures are known for the coupling 61 provided with the grating. Either the grating is arranged in the coupling area (FIG. 3) or two coupling areas are realized between which separate grating are provided for each fiber.
  • connections with several channels between the individual network nodes can also be realized.
  • the add-drop modules shown in FIGS. 2 and 3 can be connected in series or adapted accordingly.
  • the use of wider filters also enables several adjacent channels to be coupled in and out.
  • FIG. 4 shows an expanded ring network in which the optical fiber 1 has been supplemented by an optical fiber 1P provided for protection purposes.
  • the data signals - only the protection data signal ⁇ AP is shown - are first transmitted via the undisturbed part of the ring network and then fed into the protection optical fiber 1P in the opposite direction, so that all network nodes receive the data signal.
  • the transmission path is selected by means of changeover switches provided in the network nodes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un réseau en anneau optique unidirectionnel comportant plusieurs noeuds de réseau (NA, NB, ...) à chacun desquels est affectée une voie de transmission (μA) ayant une bande de transmission utilisée une seule fois. On configure le réseau à l'aide de filtres de réception (54) commutables ou réglables.
PCT/DE1999/003303 1998-10-14 1999-10-14 Reseau en anneau optique unidirectionnel WO2000022765A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99900055A EP1121777A1 (fr) 1998-10-14 1999-10-14 Reseau en anneau optique unidirectionnel
JP2000576569A JP2002527990A (ja) 1998-10-14 1999-10-14 単方向性光リングネットワーク

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19847410.5 1998-10-14
DE19847410A DE19847410A1 (de) 1998-10-14 1998-10-14 Optisches unidirektionales Ringnetz

Publications (2)

Publication Number Publication Date
WO2000022765A1 true WO2000022765A1 (fr) 2000-04-20
WO2000022765B1 WO2000022765B1 (fr) 2000-08-03

Family

ID=7884480

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/003303 WO2000022765A1 (fr) 1998-10-14 1999-10-14 Reseau en anneau optique unidirectionnel

Country Status (4)

Country Link
EP (1) EP1121777A1 (fr)
JP (1) JP2002527990A (fr)
DE (1) DE19847410A1 (fr)
WO (1) WO2000022765A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003007521A1 (fr) * 2001-07-13 2003-01-23 Lumentis Ab Reseau en anneau mrl pour connexions souples
GB2433662A (en) * 2004-09-29 2007-06-27 Fujitsu Ltd Light inserting/branching device and optical network system
US9246623B2 (en) 2013-12-02 2016-01-26 At&T Intellectual Property I, L.P. Method and apparatus for routing traffic using asymmetrical optical connections

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19939853C2 (de) * 1999-08-23 2003-03-13 Siemens Ag Add/Drop-Drop & Continue-Modul und Drop & Continue-Modul
JP7063202B2 (ja) * 2018-08-31 2022-05-09 日本電信電話株式会社 光ネットワーク、光伝送システムおよびこれに含まれる光ノード

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO1997006614A1 (fr) * 1995-08-04 1997-02-20 Alcatel Alsthom Compagnie Generale D'electricite Multiplexeur a insertion-extraction
US5699177A (en) * 1993-04-23 1997-12-16 Canon Kabushiki Kaisha Communication method in network system for performing information transmission among terminal equipments using light beams of a plurality of wavelengths, terminal equipment used in the method and network system using the method
WO1998049795A1 (fr) * 1997-04-25 1998-11-05 Ciena Corporation Multiplexeurs optiques d'insertion-extraction compatibles avec des systemes tres denses de communication optique a multiplexage par repartition en longueur d'onde (mrl)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5699177A (en) * 1993-04-23 1997-12-16 Canon Kabushiki Kaisha Communication method in network system for performing information transmission among terminal equipments using light beams of a plurality of wavelengths, terminal equipment used in the method and network system using the method
WO1997006614A1 (fr) * 1995-08-04 1997-02-20 Alcatel Alsthom Compagnie Generale D'electricite Multiplexeur a insertion-extraction
WO1998049795A1 (fr) * 1997-04-25 1998-11-05 Ciena Corporation Multiplexeurs optiques d'insertion-extraction compatibles avec des systemes tres denses de communication optique a multiplexage par repartition en longueur d'onde (mrl)

Non-Patent Citations (4)

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Title
CHAWKI M J ET AL: "WAVELENGTH REUSE SCHEME IN A WDM UNIDIRECTIONAL RING NETWORK USING NETWORK USING A PROPER FIBRE GRATING ADD/DROP MULTIPLEXER", ELECTRONICS LETTERS,GB,IEE STEVENAGE, vol. 31, no. 6, 16 March 1995 (1995-03-16), pages 476 - 477, XP000530329, ISSN: 0013-5194 *
ELREFAIE A F: "SELF-HEALING WDM RING NETWORKS WITH ALL-OPTICAL PROTECTION PATH", PROCEEDINGS OF THE OPTICAL FIBER COMMUNICATION CONFERENCE,US,NEW YORK, IEEE, vol. CONF. 15, 1992, pages 255 - 256, XP000341557, ISBN: 1-55752-222-7 *
HAMEL A ET AL: "INCREASED CAPACITY IN AN MS PROTECTION RING USING WDM TECHNIQUE ANDOADM: THE COLOURED SECTION RING", ELECTRONICS LETTERS,GB,IEE STEVENAGE, vol. 32, no. 3, 1 February 1996 (1996-02-01), pages 234 - 235, XP000554959, ISSN: 0013-5194 *
WILLNER A E ET AL: "OPTICALLY-AMPLIFIED WDM RING NETWORK INCORPORATING CHANNEL-DROPPINGFILTERS", IEEE PHOTONICS TECHNOLOGY LETTERS,US,IEEE INC. NEW YORK, vol. 6, no. 6, 1 June 1994 (1994-06-01), pages 760 - 763, XP000457241, ISSN: 1041-1135 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003007521A1 (fr) * 2001-07-13 2003-01-23 Lumentis Ab Reseau en anneau mrl pour connexions souples
US7218805B2 (en) 2001-07-13 2007-05-15 Transmode Holding Ab WDM ring network for flexible connections
GB2433662A (en) * 2004-09-29 2007-06-27 Fujitsu Ltd Light inserting/branching device and optical network system
GB2433662B (en) * 2004-09-29 2009-04-08 Fujitsu Ltd Optical add/drop multiplexer and optical network system
US7657181B2 (en) 2004-09-29 2010-02-02 Fujitsu Limited Optical add/drop multiplexer and optical network system
US9246623B2 (en) 2013-12-02 2016-01-26 At&T Intellectual Property I, L.P. Method and apparatus for routing traffic using asymmetrical optical connections
US9413640B2 (en) 2013-12-02 2016-08-09 At&T Intellectual Property I, L.P. Method and apparatus for routing traffic using asymmetrical optical connections
US9735912B2 (en) 2013-12-02 2017-08-15 At&T Intellectual Property I, L.P. Method and apparatus for routing traffic using asymmetrical optical connections
US10171197B2 (en) 2013-12-02 2019-01-01 At&T Intellectual Property I, L.P. Method and apparatus for routing traffic using asymmetrical optical connections

Also Published As

Publication number Publication date
WO2000022765B1 (fr) 2000-08-03
EP1121777A1 (fr) 2001-08-08
JP2002527990A (ja) 2002-08-27
DE19847410A1 (de) 2000-04-20

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