Patent ID: 9515743
Filing Date: 2016-12-06
CPC Classification: H04B,H04J,H04L

Claim Text:
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, when phase variations of the first and second demodulated signals or amplitude variations of the first and second demodulated signals are greater than a first predetermined value, causes the digital signal processor to interrupt processing using the polarization separation digital signal processing algorithm, 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.