Optical receiver and optical receiving method

摘要

An optical receiver, includes: a signal processor to perform digital signal processing on a polarization demultiplexed signal obtained by demultiplexing a polarization multiplexed signal corresponding to a reception signal, the signal processor includes: an adaptive equalization circuit to compensate for the polarization demultiplexed signal by control of a filter coefficient; a first frequency offset estimation circuit to receive a first polarization demultiplexed signal diverged at a preceding stage and estimate a first frequency offset; a second frequency offset estimation circuit to receive a second polarization demultiplexed signal diverged at a succeeding stage and estimate a second frequency offset; and a decision circuit to decide whether the filter coefficient is correct based on a first difference between the first frequency offset and the second frequency offset and output, when deciding that the filter coefficient is incorrect, a first trigger for re-calculation of the filter coefficient.

主权项

1. An optical receiver, comprising:
a signal processor configured to perform digital signal processing on a polarization demultiplexed signal which is obtained by demultiplexing a polarization multiplexed signal corresponding to a reception signal, the signal processor includes: an adaptive equalization circuit configured to compensate for the polarization demultiplexed signal by control of a filter coefficient; a first frequency offset estimation circuit configured to receive a first polarization demultiplexed signal which is diverged at a preceding stage to the adaptive equalization circuit and estimate a first frequency offset of the first polarization demultiplexed signal for each of polarized waves; a second frequency offset estimation circuit to receive a second polarization demultiplexed signal diverged at a succeeding stage to the adaptive equalization circuit and estimate a second frequency offset of the second polarization demultiplexed signal for each of the polarized waves; and a decision circuit to decide whether the filter coefficient is correct based on a first difference between the first frequency offset and the second frequency offset and output, when the decision circuit decides that the filter coefficient is incorrect, a first trigger for re-calculation of the filter coefficient to the adaptive equalization circuit.