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Routing method of optical communication network node apparatus and optical communication network node apparatus

外国特許コード F120006219
整理番号 NU-0206
掲載日 2012年2月14日
出願国 アメリカ合衆国
出願番号 73307008
公報番号 20100215366
公報番号 8326143
出願日 平成20年3月6日(2008.3.6)
公報発行日 平成22年8月26日(2010.8.26)
公報発行日 平成24年12月4日(2012.12.4)
国際出願番号 JP2008054076
国際公開番号 WO2009022478
国際出願日 平成20年3月6日(2008.3.6)
国際公開日 平成21年2月19日(2009.2.19)
優先権データ
  • 特願2007-210576 (2007.8.11) JP
  • 2008JP054076 (2008.3.6) WO
発明の名称 (英語) Routing method of optical communication network node apparatus and optical communication network node apparatus
発明の概要(英語) An optical communication network node apparatus is provided that considerably reduces the node apparatus in scale, especially, a switch device in scale relative to increase in the number of wavelength multiplexes.
With a routing operation on the basis of a wavelength at an intra-ring traffic step, light output from a plurality of demultiplexers is subjected to add/drop and routing processes and is directly or indirectly distributed to a plurality of multiplexers, and at an inter-ring traffic step (including a routing operation on the basis of a wavelength group), among lights output from a plurality of demultiplexers, light of another wavelength preliminarily set for inter-ring transmission and different from the light of the wavelength preliminarily set for the intra-ring transmission is subjected to the routing process, and, therefore, the node apparatus is considerably reduced to a smaller scale as compared to a node apparatus that achieves concatenation in a manner capable of routing lights of all the wavelengths to arbitrary optical rings.
従来技術、競合技術の概要(英語) BACKGROUND ART
An optical communication network is known that is made up of N rings including first and second bidirectional optical rings each having at least two annular optical fibers.
The optical communication network is provided with an optical communication network node apparatus that sets transmission paths of respective wavelengths making up wavelength multiplexed light including a plurality of wavelengths within each optical ring and between respective optical rings in the N rings.
For example, this corresponds to the optical communication network described in Nonpatent Literature 1.
A technique has been proposed to constrain the scale of nodes performing the cross connect of the wavelength multiplexed light by performing routing (path setting) on the basis of a waveband (band) including a predetermined number of wavelengths in the optical communication network.
For example, this corresponds to the technique described in Nonpatent Literature 2.
Nonpatent Literature 1: Sato, "Broadband Optical Networking Technology", Institute of Electronics, Information and Communication Engineers, 2003
Nonpatent Literature 2: Kakehashi, Hasegawa, and Sato, IEICE Technical Report, PN2006-12, August 2006

特許請求の範囲(英語) [claim1]
1. An optical communication network node apparatus in an optical communication network including a first optical ring and a second optical ring each having at least two annular optical fibers, the optical communication network node apparatus setting a transmission path of wavelength multiplexed light including a plurality of wavelengths within the first optical ring or the second optical ring and between the first optical ring and the second optical ring, the apparatus comprising: a plurality of group demultiplexers that demultiplex for each wavelength group and respectively output the wavelength multiplexed lights respectively input from the pairs of the annular optical fibers;
a plurality of wavelength demultiplexers that demultiplex for each wavelength and respectively output an optical signal of a wavelength group containing only light of wavelength preliminarily set for the intra-ring transmission among the wavelength groups output from the plurality of the group demultiplexers;
a plurality of group multiplexers that multiplex lights of wavelength groups respectively input for transmission to the pairs of the annular optical fibers to respectively output the lights to the pairs of the annular optical fibers;
a plurality of wavelength multiplexers that multiplex lights of wavelengths respectively input for the intra-ring traffic into wavelength groups to respectively output the wavelength groups to the plurality of the group multiplexers;
a plurality of intra-ring traffic switch devices that branch/insert as needed and distribute lights of respective wavelengths respectively output from the plurality of the wavelength demultiplexers to the wavelength multiplexers performing output to the optical ring that has transmitted the light among the plurality of the wavelength multiplexers;
a plurality of inter-ring transmission wavelength group switch devices that respectively distribute to the plurality of the group multiplexers the wavelength groups containing only lights of wavelengths preliminarily set for the inter-ring transmission among a plurality of wavelength groups respectively output from the plurality of the group demultiplexers; and
a type-mixed wavelength group multiplexing/demultiplexing device that demultiplexes a type-mixed wavelength group including wavelengths having mutually different traffic types of the inter-ring transmission among a plurality of wavelength groups respectively output from the plurality of the group demultiplexers into lights of respective wavelengths, the type-mixed-wavelength group multiplexing/demultiplexing device performing routing by using a switch device to multiplex and output new respective wavelength groups including lights of wavelengths having the same traffic types of the inter-ring transmission from the demultiplexed lights with multiplexers to the plurality of the wavelength group multiplexers through the inter-ring transmission wavelength group switch devices.
[claim2]
2. An optical communication network node apparatus in an optical communication network including N rings including a first optical ring and a second optical ring each having at least two annular optical fibers, the optical communication network node apparatus setting a transmission path of wavelength multiplexed light including a plurality of wavelengths within each of the rings and between the optical rings in the N rings, the apparatus comprising: a plurality of group demultiplexers that demultiplex for each wavelength group and respectively output the wavelength multiplexed lights respectively input from the pairs of the annular optical fibers;
a plurality of wavelength demultiplexers that demultiplex for each wavelength and respectively output an optical signal of a wavelength group containing only light of wavelength preliminarily set for the intra-ring transmission among the wavelength groups output from the plurality of the group demultiplexers;
a plurality of group multiplexers that multiplex lights of wavelength groups respectively input for transmission to the pairs of the annular optical fibers to respectively output the lights to the pairs of the annular optical fibers;
a plurality of wavelength multiplexers that multiplex lights of wavelengths respectively input for the intra-ring traffic into wavelength groups to respectively output the wavelength groups to the plurality of the group multiplexers;
a plurality of intra-ring traffic switch devices that branch/insert as needed and distribute lights of respective wavelengths respectively output from the plurality of the wavelength demultiplexers to the wavelength multiplexers performing output to the optical ring that has transmitted the light among the plurality of the wavelength multiplexers;
a plurality of inter-ring transmission wavelength group switch devices that respectively distribute to the plurality of the group multiplexers the wavelength groups containing only lights of wavelengths preliminarily set for the inter-ring transmission among a plurality of wavelength groups respectively output from the plurality of the group demultiplexers; and
a type-mixed wavelength group multiplexing/demultiplexing device that demultiplexes a type-mixed wavelength group including wavelengths having mutually different traffic types of the inter-ring transmission among a plurality of wavelength groups respectively output from the plurality of the group demultiplexers into lights of respective wavelengths, the type-mixed wavelength group multiplexing/demultiplexing device performing routing by using a switch device to multiplex and output new respective wavelength groups including lights of wavelengths having the same traffic types of the inter-ring transmission from the demultiplexed lights with multiplexers to the plurality of the wavelength group multiplexers through the inter-ring transmission wavelength group switch devices.
  • 発明者/出願人(英語)
  • SATO KEN-ICHI
  • HASEGAWA HIROSHI
  • ISHII KIYO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 398/3
  • 398/4
  • 398/5
  • 398/59
  • 398/83
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