Pilot-aided blind phase search for coherent optical orthogonal frequency-division multiplexing systems

Abstract. A downconversion scheme using a pilot-aided blind phase search (PA-BPS) algorithm for phase noise compensation is proposed and experimentally evaluated in coherent optical orthogonal frequency-division multiplexing systems based on optical comb and heterodyne detection. The proposed method can increase the systems bandwidth utilization efficiency and reduce the receiver complexity. Experimental results show that, based on the method, a receiver sensitivity as low as −27  dBm can be achieved in the transmission systems considered. Meanwhile, in each PA-BPS calculation, the method only requires 2 pilots and 10 testing phases.

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