Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2011-03-15
2011-03-15
Singh, Dalzid (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S084000, C398S087000
Reexamination Certificate
active
07907844
ABSTRACT:
A method is provided for routing optical signals in an optical transport network. The method includes: separating an incoming optical multiplexed signal having a plurality of wavelength-channels embodied therein into two or more channel groups, where each channel group has a subset of the wavelength-channels and channels to be routed hitlessly in a given channel group are adjacent to a channel free region; providing a wavelength selective element for each wavelength-channel to be routed hitlessly; and routing a given wavelength-channel by tuning the corresponding wavelength selective element to either the given wavelength-channel or a channel free region adjacent to the given wavelength-channel. Providing a channel free region next to each channel to be routed allows the use of inexpensive tunable elements, which typically cause hits as they tune, to effect hitless routing.
REFERENCES:
patent: 6768872 (2004-07-01), Tsuritani et al.
patent: 7221821 (2007-05-01), Eldada
patent: 2003/0026529 (2003-02-01), Durkin et al.
patent: 2003/0174949 (2003-09-01), Bhardwaj et al.
Anis Hanan
Boudreault Francois
Levner Daniel
Harness Dickey & Pierce PLC
Singh Dalzid
University of Ottawa
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