Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2006-09-26
2006-09-26
Chan, Jason (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S029000, C398S081000, C398S093000, C398S209000, C359S337500
Reexamination Certificate
active
07113709
ABSTRACT:
An optical receiver including a variable optical attenuator for controlling an optical loss value for each optical transmission line based on a predetermined optical loss value; a variable dispersion compensation module for controlling a wavelength dispersion value for each optical transmission line based on a predetermined dispersion value; an optical loss/dispersion controller for measuring the optical loss value and the wavelength dispersion value of every optical transmission line, outputting these values so that they are equal in all the optical transmission lines, and controlling the attenuator and the module based on the outputted predetermined values; a receive amplifier for receiving the optical signal whose light level is kept constant and amplifying the signal; and, a transmission line switch control module is provided for switching a working transmission line into a protection line if the optical signal level of the working line is lower than a threshold value.
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Chan Jason
Curs Nathan
Fujitsu Limited
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