Patent ID: 9020366
Filing Date: 2015-04-28
Classification: G02B,G02F,H04B,H04J

Abstract:
1. A polarization multiplexing optical receiving device comprising: a semiconductor optical element which adjusts optical signal intensity of each of a transverse electric(TE) mode and a transverse magnetic(TM) mode of a polarization-multiplexed optical signal; a polarization beam splitter which spectrally separates the polarization-multiplexed optical signal into the TE mode optical signal and the TM mode optical signal; and a control circuit which calculates the optical signal intensity ratio between the TE mode optical signal and the TM mode optical signal, which have had the optical signal intensity thereof adjusted by the semiconductor optical element and which have been spectrally separated by the polarization beam splitter, and which performs feedback control of the semiconductor optical element so that the calculated optical intensity ratio reaches a desired value, wherein the control circuit performs feedback control of the semiconductor optical element by calculating applied current for adjusting the optical intensity ratio to a desired value and outputting it to the semiconductor device, and wherein the semiconductor optical element is a semiconductor amplifier comprising: a first semiconductor amplifying portion having a gain of TE mode more dominant than a gain of TM mode; a second semiconductor amplifying portion having a gain of TM mode more dominant than a gain of TE mode; a first upper electrode which supplies a first current to the first semiconductor amplifying portion based on the applied current; a second upper electrode which supplies a second current to the second semiconductor amplifying portion based on the applied current; and a lower electrode which is a common electrode for the first semiconductor amplifying portion and the second semiconductor amplifying portion.