Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-07-06
2010-02-02
Tran, Dzung D (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S049000, C398S057000
Reexamination Certificate
active
07657180
ABSTRACT:
The present invention relates to a communication path calculation method and module. More particularly, the present invention provides a communication path calculation method and module that are implemented or incorporated in a transmission apparatus including a ROADM or the like which performs WDM communication, advertises information on a wavelength which can be added or dropped, as information on a link, and uses the information to autonomously calculate a communication path. Optical transmission equipment that is accommodated in a WDM network over which a wavelength-division multiplexed signal is transferred includes a reconfigurable OADM module. For calculation of a communication path, the OADM module creates a link table listing clients of the own equipment and connected WDMs, and advertises the link table to the other pieces of equipment accommodated by the network as pieces of information on restrictions to be imposed on routing from the own equipment. The other pieces of equipment each receive and store the advertised pieces of information on restrictions to be imposed on routing, and use the pieces of information as pieces of information on restrictions to be imposed on a calculation to calculate a communication path from the own equipment.
REFERENCES:
patent: 7145704 (2006-12-01), Islam
patent: 2004/0190900 (2004-09-01), Yagyu
patent: 2006/0013584 (2006-01-01), Miyazaki
patent: 2006/0092941 (2006-05-01), Kusama
patent: 2004/010620 (2004-01-01), None
Fujii Yasuki
Kanoh Shinya
Miyazaki Keiji
Nagata Akira
Fujitsu Limited
Staas & Halsey , LLP
Tran Dzung D
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