Patent ID: 8670679

Claim:
A coherent optical receiving apparatus, the apparatus comprising: an optical hybrid unit to generate an optical signal by combining a first optical signal inputted from an optical transmitting apparatus and a second optical signal inputted from a local oscillator; a polarization demuxer to demultiplex the optical signal generated from the optical hybrid unit to output samples where an x polarized light and a y polarized light are separated from each other; a frequency offset compensator to estimate at least one frequency offset of at least one of even-numbered samples and odd-numbered samples from among the samples outputted by the polarization demuxer, and to compensate for a frequency offset of the even-numbered samples and a frequency offset of the odd-numbered samples using the at least one estimated frequency offset; and a carver distortion compensator to compensate for phase distortions of the samples for which the compensation for the frequency offset is performed, the phase distortions being generated by the optical transmitting apparatus.