Optical communications – Fault recovery – Wdm
Reexamination Certificate
2004-11-22
2008-11-11
Vanderpuye, Kenneth (Department: 2613)
Optical communications
Fault recovery
Wdm
C398S005000, C398S009000, C398S023000, C398S034000, C398S079000, C398S091000, C398S094000, C398S095000
Reexamination Certificate
active
07450844
ABSTRACT:
WDM optical tranmsmission equipment with redundant configuration includes a plurality of tranmitters. Each tranmitter includes active and standby panels including active and standby optical transmission circuits respectively having active and standby attenuators for controlling an attenuation amount of each output of the active and standby optical transmission circuits; and a coupler combining the outputs of the active and standby attenuators. An output light wavelength of the standby optical transmission circuit is set to a set wavelength different from the output light wavelength of the active optical transmission circuit, and the attenuation amount of the standby attenuator is set to the maximum, and the standby panel is set, and subsequently, the set wavelength of the output light of the standby optical transmission circuit is set to a target wavelength identical to the output light wavelength of the active optical transmission circuit, each having, and a wavelength control method of the light output in the standby system. The problem is solved of the light emitted in a standby system as affecting an active system, while the active system is in operation.
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Nabeyama Yoshio
Ohta Kenji
Fujitsu Limited
Katten Muchin & Rosenman LLP
Liu Li
Vanderpuye Kenneth
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