| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical transmission system and a digital signal processor which are arranged so that after collectively receiving optical signals phase-modulated with the same bit pattern and sent, a redundant optical signal receiver performs phase synchronization and waveform equalization among the received signals by means of digital signal processing to synthesize signals.SOLUTION: An optical transmission system comprises a redundant optical signal receiver which collectively receives identical optical signals 1 to N transmitted through optical transmission lines, and synthesizes signals. The redundant optical signal receiver includes: N optical signal receivers which perform a coherent detection on optical signals 1 to N transmitted through the optical transmission lines, perform an analog-to-digital conversion on the resultant signals, and then output digital signals respectively; and a digital signal processor which accepts the input of the digital signals output from the N optical signal receivers, and performs phase synchronization and waveform equalization on the input signals thereby to synthesize and output signals. |
