RECEIVER, TRANSMISSION SYSTEM, METHOD FOR RECEIVING POLARIZATION MULTIPLEXED OPTICAL SIGNAL, AND NON-TRANSITORY COMPUTER READABLE MEDIUM STORING RECEIVER CONTROL PROGRAM

摘要

In a receiver, a reception front end receives a polarization-scrambled polarization multiplexed optical signal, polarization-separates the received polarization multiplexed optical signal, and converts each signal into quantized signals. A digital signal processor samples the quantized signals, demodulates the signals by using a polarization separation digital signal processing algorithm, and outputs demodulated signals. When phase and amplitude variations of the demodulated signals are greater than a predetermined value, a control circuit causes the digital signal processor to interrupt processing using the polarization separation digital signal processing algorithm, changes an initial value of a filter coefficient, and then causes the digital signal processor to start the processing using the polarization separation digital signal processing algorithm.

主权项

1. A receiver comprising:
a reception front end that receives a polarization-scrambled polarization multiplexed optical signal, polarization-separates the received polarization multiplexed optical signal into first and second polarization components, and photoelectrically converts the first and second polarization components into first and second digital signals, respectively; a digital signal processor that samples the first and second digital signals, demodulates the first and second digital signals by using a polarization separation digital signal processing algorithm, and outputs first and second demodulated signals; and a control circuit that causes the digital signal processor to interrupt processing using the polarization separation digital signal processing algorithm when phase and amplitude variations of the first and second demodulated signals are greater than a first predetermined value, changes an initial value of a filter coefficient used for the polarization separation digital signal processing algorithm, and then causes the digital signal processor to start the processing using the polarization separation digital signal processing algorithm.