Optical receiver, optical transceiver, and optical signal reception control method

An optical receiver comprising:

• a demultiplexer configured to output optical signals for a plurality of channels by demultiplexing of an optical signal input to the optical receiver;
• a photoelectric converter including a number of avalanche photodiodes corresponding to the plurality of channels, the photoelectric converter being configured to convert an optical signal from the demultiplexer into an electric signal for each channel by a corresponding one of the avalanche photodiodes;
• a monitor circuit configured to monitor an amplitude characteristic of the electric signal for each channel from the photoelectric converter, and output a monitored result indicating the amplitude characteristic of the electric signal for each channel;
• and
• a control circuit configured to control bias voltages to be applied to the avalanche photodiodes, based on the amplitude characteristics of the electric signals for the channels indicated by the monitored results from the monitor circuit, respectively, to minimize an amount of variability in the amplitude characteristic between the channels or make the amount of variability in the amplitude characteristic between the channels fall within a predetermined range.