Patent ID: 7792434

Claim:
An optical receiver for outputting an output signal corresponding to an optical signal received thereby, comprising: a light-receiving block including an avalanche photodiode for receiving the optical signal, the light-receiving block being configured to output a pair of electrical signals complementary to each other, the complementary electrical signals corresponding to the optical signal; a detection block configured to detect a magnitude of the optical signal; a discriminating block configured to discriminate the complementary electrical signals based on a discrimination level, the discriminating block including a differential amplifier configured to receive the complementary electrical signals output from the light-receiving block to output the output signal; an adjusting block; and a controlling block configured to store, in advance of operation of the optical receiver, a plurality of first control signals and a plurality of second control signals and to select one of the first control signals based on a plurality of control parameters including a magnitude of the optical signal and a temperature of the avalanche photodiode as an output to cause the adjusting block to adjust the discrimination level by adjusting an input offset voltage of the differential amplifier, and to select one of the second control signals based on the temperature of the avalanche photodiode as an output to bias the avalanche photodiode.