| 摘要 |
In a coherent optical receiver according to the invention, a polarization beam splitter inputs a polarization multiplexed optical signal obtained by multiplexing two polarization lights orthogonal to each other modulated by different information signal and separately outputs a first and a second received polarization optical signals, a 90 degree hybrid circuit makes the first and the second received polarization optical signal interfere with local light and outputs a plurality of optical signals, a photoelectric converter detects the optical signal and outputs a detected electric signal, an analog-to-digital converter digitizes the detected electric signal and outputs a digital received signal, a polarization de-multiplexing unit inputs the digital received signal and then outputs results of polarization de-multiplexing process to a phase compensation unit, and the phase compensation unit performs a phase compensation processing using, as an initial value, a phase deviation value obtained by using same initial signal as the information signal. |
