Patent ID: 9374172
Filing Date: 2016-06-21
CPC Classification: H04B

Claim Text:
1. An optical receiver, comprising: a first photodiode receiving a normal phase optical signal from a first output of a 1-bit delayed interferometer and outputting a positive signal; a second photodiode receiving a reversed phase optical signal from a second output of the 1-bit delayed interferometer and outputting a complementary signal; a differential transimpedance amplifier inputting the positive signal and the complementary signal and comprising a closed feedback loop for each input of the positive signal and the complementary signal; a level adjustment unit adjusting a signal level in the closed feedback loop; a photoelectric current detection unit detecting a photoelectric current generated in each of the first photodiode and the second photodiode; and wherein the level adjustment unit adjusts the signal level on the basis of an output of the photoelectric current detection unit, wherein the level adjustment unit adjusts a signal level in the closed feedback loop for the input of the complementary signal on the basis of the photoelectric current generated by the normal phase optical signal, and adjusts a signal level in the closed feedback loop for the input of the positive signal on the basis of the photoelectric current generated by the reversed phase optical signal.