Patent ID: 6944405

Claim:
An optical transmission system of the type having a demultiplexer for demultiplexing an input optical signal into optical signals of different channels, and a multiplexer for multiplexing the optical signals outputted from the demultiplexer, comprising: a plurality of BICDR (Bit Rate Independent Clock and Data Recovery) receivers for receiving the associated optical signals outputted from the demultiplexer, each BICDR receiver for converting the associated optical signal into an electrical signal and for reproducing clocks and data based on the bit rate of the electrical signal; a switchboard having a cross-connect switch for receiving the output signal from the respective BICDR receiver, the switchboard comprising: a plurality of bit rate discriminating units for receiving the output signals from the respective BICDR receivers to generate bit rate discriminating signals associated with the BICDR receivers; and, a temperature sensing unit for outputting a temperature sensing signal; and, a central processing unit for receiving the bit rate discriminating signals from the respective bit rate discriminating units and the temperature sensing signal from the temperature sensing unit, for compensating each received bit rate discriminating signal with a temperature-dependent bit rate value read from a memory in response to the temperature sensing signal, and for controlling the bit rate of each associated BICDR receiver based on the respective compensated bit rate discriminating signal.