Optical receiver

Abstract

[Problem] An optical receiver using a polarization demultiplexing technique is miniaturized. [Solution] An optical receiverA for receiving a polarization multiplexed signal obtained by performing orthogonal polarization multiplexing on two optical signals. The optical receiver includes an ILsplitting the polarization multiplexed signal into two transmitted signals that are asymmetric in terms of a light transmission characteristic, O/Esandconverting the transmitted signals resulting from the split into electrical signals, a downsamplerdownsampling the electrical signals resulting from the conversion to generate low-speed digital signals, a calculatorcalculating coefficients of a polarization separation matrix from the resultant low-speed digital signals, a level adjusterA adjusting, in accordance with the coefficients resulting from the calculation, signal levels of the electrical signals resulting from the conversion to generate a plurality of adjustment signals, addersAa andAb adding the generated adjustment signals to generate addition signals, and discriminatorsandrestoring and extracting the two optical signals from the generated addition signals.