EP1508216A2 - Reseau en fibre optique comportant des noeuds et procede correspondant - Google Patents

Reseau en fibre optique comportant des noeuds et procede correspondant

Info

Publication number
EP1508216A2
EP1508216A2 EP03757280A EP03757280A EP1508216A2 EP 1508216 A2 EP1508216 A2 EP 1508216A2 EP 03757280 A EP03757280 A EP 03757280A EP 03757280 A EP03757280 A EP 03757280A EP 1508216 A2 EP1508216 A2 EP 1508216A2
Authority
EP
European Patent Office
Prior art keywords
traffic
optical
network
ring
node
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP03757280A
Other languages
German (de)
English (en)
Inventor
Susumu Kinoshita
Ashwin Anil Gumaste
Koji Takeguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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
Priority claimed from US10/158,348 external-priority patent/US7283739B2/en
Priority claimed from US10/158,523 external-priority patent/US7283740B2/en
Priority claimed from US10/262,818 external-priority patent/US7184663B2/en
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to EP11161851A priority Critical patent/EP2339771A3/fr
Priority to EP11161850A priority patent/EP2339770A1/fr
Publication of EP1508216A2 publication Critical patent/EP1508216A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • 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
    • H04J14/0293—Optical channel protection
    • 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
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0205—Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
    • 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
    • H04J14/0206—Express channels arrangements
    • 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
    • H04J14/0213—Groups of channels or wave bands arrangements
    • 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
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • 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
    • H04J14/0208—Interleaved arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0015—Construction using splitting combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0016—Construction using wavelength multiplexing or demultiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0024—Construction using space switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/009—Topology aspects
    • H04Q2011/0092—Ring

Definitions

  • FIGURE 12B is a block diagram illustrating a combining element of an add/drop node of FIGURE 11 in accordance with another embodiment of the present invention
  • FIGURE 12C is a block diagram illustrating the combining element of
  • FIGURE 14A illustrates details of an add/drop node of the network of FIGURE 11 in accordance with another embodiment ofthe present invention
  • FIGURE 14B illustrates details of a gateway node of the network of FIGURE
  • FIGURE 18 is a block diagram illustrating an optical network in accordance with yet another embodiment ofthe present invention.
  • the gateways may be operable to terminate ingress traffic channels from a subnet that have reached their destination ADNs (including those that have or will reach their destination nodes in an opposite direction) and to forward ingress traffic channels from a subnet that have not reached their destination ADNs.
  • the gateway nodes may comprise a demultiplexer to demultiplex the signal into constituent traffic channels, switches to selectively terminate traffic channels, and a multiplexer to multiplex the remaining signal before exiting the gateway. Further details regarding the gateways 14 are described below in reference to FIGURE 4A.
  • the rings 16 and 18 may, in response to a line cut or other interruption, be provisioned to terminate in ADNs 12 adjacent to the interruption using switch elements in ADNs 12.
  • Switch elements may comprise simple on-off switches, 2x2 switches, optical cross connects, or other suitable switch elements. h one embodiment, a portion ofthe channels are open at the boundaries ofthe subnets at both gateways 14. Within each subnet, traffic is passively added to and passively dropped from the rings 16 and 18, channel spacing is flexible, and the nodes are free to transmit and receive signals to and from nodes within the subnet.
  • an intra-subnet traffic stream utilizes its wavelength/channel only within its subnet, the wavelength/channel used for intra-subnet traffic in one subnet is free to be used in the other subnet by another traffic stream.
  • the present invention increase the overall capacity of the network, while maintaining flexible channel spacing within individual subnets.
  • inter- subnet lightpaths (those whose ingress and egress nodes are on different subnets or different rings for that matter) are assigned on the highest possible wavelengths. This way we have a static load balancing which also may reduce the number of net transponder card type required in the ring.
  • Each node may have a minimum fixed capacity for transmission. Each node may also have a maximum variable capacity for transmission and this is generally the upper bound on its maximum traffic requirement. Within the subnet the nodes may be free to communicate with each other. Each node is allotted a band for transmission that can "listen" to the entire bandwidth for reception. This band is a dedicated band, and in addition can also have a small overlap section which can be used for non- dedicated applications by intelligent multiplexing of statistical bandwidth access.
  • Distributing element 80 may comprise a plurality of distributing amplifiers.
  • the distributing element 80 may comprise a drop coupler feeding into the distributing amplifiers which each include an amplifier and an optical splitter.
  • a first distributing amplifier may include amplifier 94 and optical splitter 95 while a second distributing amplifier may include amplifier 96 and splitter 97.
  • the amplifiers 94 and 96 may comprise EDFAs or other suitable amplifiers.
  • Splitters 95 and 97 may comprise splitters with one optical fiber ingress lead and a plurality of optical fiber drop leads 98.
  • the drop leads 98 may be connected to one or more filters 100 which in turn may be connected to one or more drop optical receivers 102.
  • the ADN 12 further comprises counterclockwise add fiber segment 144, counterclockwise drop fiber segment 146, clockwise add fiber segment 142, clockwise drop fiber segment 148, OSC fiber segments 150, 152, 154, and 156, and connectors 68. As illustrated, connection 68 may be angled to avoid reflection. As previously described a plurality of passive physical contact connectors 70 may be included where appropriate so as to communicably connect the various elements of ADN 12.
  • locally-derived traffic is transmitted by a plurality of add optical senders 140 to combining element 130 of the node 12 where the signals are combined, amplified, and forwarded to the transport elements 50 and 52, as described above, via counterclockwise add segment 144 and clockwise add segment 142.
  • the locally derived signals may be combined by the optical coupler 136, by a multiplexer or other suitable device.
  • Locally-destined traffic is dropped to distributing element 80 from counterclockwise drop segment 146 and clockwise drop segment 148.
  • Distributing element 80 splits the drop signal comprising the locally-destined traffic into multiple generally identical signals and forwards each signal to an optical receiver via a drop lead 98.
  • the signal received by optical receivers 102 may first be filtered by filters 100. Filters 100 maybe tunable filters or other suitable filters and receivers 102 may be broadband or other suitable receivers.
  • an amplifier loss-of-light (LOL) alarm may produce multiple alarms.
  • LLOL loss-of-light
  • a fiber cut may produce amplifier LOL alarms at adjacent nodes and also error alarms from the optical receivers.
  • the network comprises a combination of active and passive nodes, this way, active nodes may provide for protection switching functionality while the addition of passive nodes may allow for additional ADNs in the network while minimizing the additional cost associated with the additional nodes.
  • the distributing element and the combining element may comprise a divided distributing element (DDE) and a divided combining element (DCE), respectively.
  • Multiplexer 204 multiplexes the channels into one optical signal and to forward the optical signal to OSC filter 74.
  • OSC filter 74 adds the OSC signal from EMS 110, and the ring 18 receives the egress signal.
  • gateways 14 may be further operable to add and drop traffic from and to local clients and/ or to and from other networks.
  • FIGURE 4B is a block diagram illustrating a mux/demux unit of the gateway of FIGURE 4A in accordance with another embodiment of the present invention.
  • mux/demux unit 240 of FIGURE 4B may be substituted for mux/demux modules 214 of FIGURE 4A.
  • Optical signals from the plurality of transmitters 249 are multiplexed in multiplexer 204 and the multiplexed signal forwarded as described above in reference to FIGURE 4A.
  • O-E-O unit 246 may act as a regenerator ofthe signals passing through the gateway 14.
  • Lightpath 270 terminates at gateway 25 at an open switch in counterclockwise transport segment 200 corresponding to the channel of the traffic stream.
  • Lightpath 272 terminates at gateway 258 at an open switch in clockwise transport segment 202 corresponding to the channel ofthe traffic stream.
  • the ADN 262 traffic stream and the ADN 252 traffic stream may represent different traffic but may be conveyed within the same channel, or wavelength. However, since the ADN 262 traffic sfream and the ADN 252 traffic sfream are isolated within different subnets. In this way, the overall capacity of the network is increased for that channel, even though channel flexibility is maintained within each subnet. 064731.0382
  • the ADN 262 traffic stream is an inter-subnet traffic stream carried on light paths 350 and 352, with at least a portion of the light paths carried in both subnets 20 and 22.
  • the destination node ofthe ADN 262 traffic stream is ADN 254.
  • the optical rings 16 and 18 are open for the channel ofthe ADN 262 traffic sfream at switches 210 of gateway 250 co ⁇ esponding to that channel, but are closed at switches 210 of gateway 258. Switches in the ADNs are in the closed, pass-through state. 064731.0382
  • FIGURE 8 is a block diagram illusfrating protection switching and light path protection of the working light path of FIGURE 7 in accordance with one embodiment of the present invention.
  • the ADN 262 traffic stream is an intra-subnet traffic sfream.
  • the line cut 284 prevents the ADN 262 traffic stream from reaching its destination node. Specifically, the line cut prevents fraffic from travelling on line path 350 to ADNs 254, 252, and 250.
  • present invention in the particular embodiment shown in FIGURES 11 - 17, may be utilized in networks with two, three, or more subnets.
  • each ADN 508 receives traffic from the rings 510 and 512 and drops traffic destined for the local clients.
  • the ADNs 508 may multiplex data from clients for transmittal in the rings 510 and 512 and may demultiplex channels of data from the rings 510 and 512 for clients. Traffic may be dropped by making the fraffic available for transmission to the local clients. Thus, traffic may be dropped and yet continue to circulate on a ring.
  • switch 660 is operable such that a given receiver at a destination node during normal operations that receives an optical signal from a first ring may, during protection switching, receive that signal from the second ring. Further details regarding protection switching is described in reference to
  • FIGURE 14A illustrates details of an add/drop node of the network of FIGURE 11 in accordance with another embodiment of the present invention.
  • OSC signals are fransmitted in-band with revenue- generating fraffic.
  • the node 712 may in another embodiment, be provisioned for external OSC signals (as illustrated in FIGURE 2). 064731.0382
  • the node 712 comprises DCE 550 and DDE 650 as described above in reference to FIGURES 12A and 13 A, respectively.
  • Counterclockwise transport element 714 comprises amplifier 56, switch 63, counterclockwise drop coupler 58, and counterclockwise add coupler 72 as described above in reference to counterclockwise transport segment of FIGURE 2.
  • OSC filter 54 and 74 a single OSC rejection filter 716 is provisioned between couplers 58 and 72.
  • Traffic streams 750 and 752 terminate at gateway 514 at the open switch in the counterclockwise transport segment 200 co ⁇ esponding to the channel of the traffic stream.
  • Traffic streams 750, 752, 754, and 756 are carried on the same channel or wavelength; however, the sfreams are transmitted from a separate optical sender within the DCEs of their respective origination ADNs.
  • switches 62 in the transport element 50 of ADN 516 and switch 62 in the transport element 52 of ADN 518 are opened. In this way, channel interference is prevented, for example, if the line cut 560 only affects one ring, or during repair operations.
  • FIGURE 18 is a block diagram illustrating another embodiment of an optical network.
  • the network 900 comprises a plurality of add/drop nodes 902 and a hub node 904.
  • Clockwise ring 901 and counterclockwise ring 903 connect the nodes.
  • FIGURE 24 is a block diagram illustrating a multi-subnet optical ring network in accordance with another embodiment of the present invention.
  • the network of FIGURE 24 may provide for 1+1 protection of traffic in long-haul networks.
  • Network 1100 of FIGURE 24 comprises rings 1114 and 1116. In the illustrated 064731.0382
  • gateway node 1102 comprises subnodes 1200 and 1202.
  • Subnodes 1200 and 1202 each comprise amplifiers 64 as described above in reference to FIGURE 2, a demultiplexer 1204, a multiplexer 1206.
  • Subnode 1200 is operable to demultiplex traffic from optical ring 1116, to drop demultiplexed fraffic, to add local traffic, and to multiplex traffic for forwarding on optical ring 1116.
  • Subnode 1202 is operable to demultiplex traffic from optical ring 1114, to drop demultiplexed traffic, to add local traffic, and to multiplex traffic for forwarding on optical ring 1114.

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  • 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 optique comportant une pluralité de noeuds d'insertion-extraction, couplés à une boucle optique. Chaque noeud est capable d'insérer et d'extraire passivement des éléments du trafic de la boucle optique. Le réseau optique peut également comporter une pluralité de sous-réseaux, une pluralité de noeuds d'insertion-extraction étant couplée à chaque sous-réseau. Le réseau peut également comporter une pluralité de noeuds de passerelle. Chaque noeud de passerelle est couplé à la boucle optique au niveau d'une interface entre des sous-réseaux adjacents et peut transmettre ou bloquer des ondes de longueurs définies entre des sous-réseaux, de manière à permettre une réutilisation des longueurs d'ondes dans les sous-réseaux et à mettre en oeuvre une commutation de protection.
EP03757280A 2002-05-29 2003-05-21 Reseau en fibre optique comportant des noeuds et procede correspondant Withdrawn EP1508216A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11161851A EP2339771A3 (fr) 2002-05-29 2003-05-21 Réseau de boucle optique doté de noeuds et procédé
EP11161850A EP2339770A1 (fr) 2002-05-29 2003-05-21 Réseau de boucle optique doté de noeuds et procédé

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US262818 1994-06-21
US10/158,348 US7283739B2 (en) 2002-05-29 2002-05-29 Multiple subnets in an optical ring network and method
US158348 2002-05-29
US158523 2002-05-29
US10/158,523 US7283740B2 (en) 2002-05-29 2002-05-29 Optical ring network with optical subnets and method
US10/262,818 US7184663B2 (en) 2002-05-29 2002-10-01 Optical ring network with hub node and method
PCT/US2003/016193 WO2003104849A2 (fr) 2002-05-02 2003-05-21 Reseau en fibre optique comportant des noeuds et procede correspondant

Publications (1)

Publication Number Publication Date
EP1508216A2 true EP1508216A2 (fr) 2005-02-23

Family

ID=29740675

Family Applications (3)

Application Number Title Priority Date Filing Date
EP03757280A Withdrawn EP1508216A2 (fr) 2002-05-29 2003-05-21 Reseau en fibre optique comportant des noeuds et procede correspondant
EP11161851A Withdrawn EP2339771A3 (fr) 2002-05-29 2003-05-21 Réseau de boucle optique doté de noeuds et procédé
EP11161850A Withdrawn EP2339770A1 (fr) 2002-05-29 2003-05-21 Réseau de boucle optique doté de noeuds et procédé

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP11161851A Withdrawn EP2339771A3 (fr) 2002-05-29 2003-05-21 Réseau de boucle optique doté de noeuds et procédé
EP11161850A Withdrawn EP2339770A1 (fr) 2002-05-29 2003-05-21 Réseau de boucle optique doté de noeuds et procédé

Country Status (3)

Country Link
EP (3) EP1508216A2 (fr)
JP (2) JP4256843B2 (fr)
WO (1) WO2003104849A2 (fr)

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Publication number Priority date Publication date Assignee Title
US7283740B2 (en) 2002-05-29 2007-10-16 Fujitsu Limited Optical ring network with optical subnets and method
US7184663B2 (en) 2002-05-29 2007-02-27 Fujitsu Limited Optical ring network with hub node and method
US7283739B2 (en) 2002-05-29 2007-10-16 Fujitsu Limited Multiple subnets in an optical ring network and method
US7321729B2 (en) 2003-05-29 2008-01-22 Fujitsu Limited Optical ring network with selective signal regeneration and wavelength conversion
US7483637B2 (en) 2003-11-26 2009-01-27 Fujitsu Limited Optical ring network with optical subnets and method
US20050175346A1 (en) * 2004-02-10 2005-08-11 Fujitsu Limited Upgraded flexible open ring optical network and method
US7369765B2 (en) * 2004-02-26 2008-05-06 Fujitsu Limited Optical network with selective mode switching
US20050196169A1 (en) * 2004-03-03 2005-09-08 Fujitsu Limited System and method for communicating traffic between optical rings
JP4520763B2 (ja) * 2004-03-29 2010-08-11 富士通株式会社 中継伝送装置
US20050286896A1 (en) * 2004-06-29 2005-12-29 Fujitsu Limited Hybrid optical ring network
US7627245B2 (en) * 2004-12-16 2009-12-01 Tellabs Operations, Inc. System and method for re-using wavelengths in an optical network
US7120360B2 (en) 2005-01-06 2006-10-10 Fujitsu Limited System and method for protecting traffic in a hubbed optical ring network
US7515828B2 (en) * 2005-03-15 2009-04-07 Fujitsu Limited System and method for implementing optical light-trails
US7466917B2 (en) 2005-03-15 2008-12-16 Fujitsu Limited Method and system for establishing transmission priority for optical light-trails
US7616891B2 (en) 2005-03-30 2009-11-10 Fujitsu Limited System and method for transmission and reception of traffic in optical light-trails
US7787763B2 (en) * 2005-04-04 2010-08-31 Fujitsu Limited System and method for protecting optical light-trails
US7457540B2 (en) * 2005-04-29 2008-11-25 Fujitsu Limited System and method for shaping traffic in optical light-trails
US7499465B2 (en) 2005-07-19 2009-03-03 Fujitsu Limited Heuristic assignment of light-trails in an optical network
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WO2007040575A1 (fr) * 2005-09-15 2007-04-12 Tellabs Operations, Inc. Systeme et procede de reutilisation des longueurs d'ondes dans un reseau optique
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Also Published As

Publication number Publication date
EP2339771A3 (fr) 2011-12-07
WO2003104849A2 (fr) 2003-12-18
EP2339771A2 (fr) 2011-06-29
JP2005528064A (ja) 2005-09-15
JP4256843B2 (ja) 2009-04-22
JP4256910B2 (ja) 2009-04-22
JP2008271603A (ja) 2008-11-06
WO2003104849A3 (fr) 2004-04-22
EP2339770A1 (fr) 2011-06-29

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Inventor name: GUMASTE, ASHWIN, ANIL

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