Optical receiving apparatus

摘要

There is provided an optical receiving apparatus, including a receiver configured to perform coherent reception by mixing first light of a received optical signal and second light generated by a local oscillator, a monitor configured to monitor a first frequency of the first light, and a controller configured to control a second frequency of the second light, based on a difference between the first frequency and the second frequency so as to reduce the difference.

主权项

1. An optical receiving apparatus, comprising:
a receiver configured to perform coherent reception by mixing first light of a received optical signal and second light generated by a local oscillator; a monitor configured to monitor a first frequency of the first light; and a controller configured to control a second frequency of the second light, based on a difference between the first frequency and the second frequency so as to reduce the difference, the controller controlling the second frequency of the second light by: adding a difference between the first frequency and second frequency to the second frequency; after the adding, determining whether an error occurs in the receiver; and when an error occurs in the receiver, sweeping a range for the second frequency so to set the second frequency at a frequency at which the error is removed, the range being determined by subtracting an allowable range of the difference between the first frequency and the second frequency from a sum of a value indicating reliability of the second frequency of the second light generated by the local oscillator and a value indicating reliability of the first frequency of the first light monitored by the monitor.