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

Foreign code F120006219
File No. J1020-11WO
Posted date Feb 14, 2012
Country United States of America
Application number 73307008
Gazette No. 20100215366
Gazette No. 8326143
Date of filing Mar 6, 2008
Gazette Date Aug 26, 2010
Gazette Date Dec 4, 2012
International application number JP2008054076
International publication number WO2009022478
Date of international filing Mar 6, 2008
Date of international publication Feb 19, 2009
Priority data
  • P2007-210576 (Aug 11, 2007) JP
  • 2008WO-JP54076 (Mar 6, 2008) WO
Title Routing method of optical communication network node apparatus and optical communication network node apparatus
Abstract (US8326143)
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.
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • SATO KEN-ICHI
  • HASEGAWA HIROSHI
  • ISHII KIYO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
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