Optical communications – Multiplex – Optical switching
Reexamination Certificate
2003-07-10
2010-10-19
Bello, Agustin (Department: 2613)
Optical communications
Multiplex
Optical switching
C398S045000, C398S059000
Reexamination Certificate
active
07817918
ABSTRACT:
In a wavelength division multiplex (WDM) optical communications network having a plurality of nodes, each of which comprises a wavelength selective optical cross-connect having a plurality of switching matrices, each switching matrix being provided for switching wavelength channels of a specific wavelength, a method of transmitting information from a start node to a target node includes the steps of applying to respective inputs of switching matrices of the start cross-connect, at least two wavelength channels (working an protection channels) having different wavelengths but which are modulated with the same information; transmitting the working and protection channels to the target cross-connect; and dropping the working and protection channels at outputs of different switching matrices provided for different wavelengths of the target cross-connect.
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Bello Agustin
Ericsson AB
Kirschstein et al.
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