CPC H04B 10/613 (2013.01) [H04B 1/0483 (2013.01); H04B 10/61 (2013.01)] | 8 Claims |
1. An optical communication system configured to perform digital coherent transmission, the optical communication system comprising:
N (N is an integer of 2 or greater) transmission channels configured to transmit optical signals obtained by modulating light beams with pieces of transmission data;
N receivers connected to the N transmission channels in a one-to-one manner and configured to receive the optical signals transmitted through the corresponding N transmission channels by performing coherent detection with single local oscillator light beam;
a signal processing unit connected to a receiver of the N receivers connected to a shortest transmission channel and configured to acquire a transfer function for removing signal distortion of an optical signal of the optical signals propagated through the shortest transmission channel, the shortest transmission channel being a transmission channel with a shortest transmission delay time among the N transmission channels; and
N−1 demodulation units connected, in a one-to-one manner, to receivers of the N receivers connected, in a one-to-one manner, to other transmission channels which are other than the shortest transmission channel among the N transmission channels and configured to remove signal distortions of optical signals propagated through the corresponding other transmission channels by using the transfer function and demodulate the pieces of transmission data.
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