Adaptive joint-polarization carrier phase recovery for optical coherent communication

Coherent communication with multi-level modulation and digital signal processing (DSP) is considered a promising solution to satisfy the exponentially-growing Internet traffic. DSP algorithms with low computational complexity and feed-forward (FF) structure are highly desirable in high baud rate optical coherent receivers. We present a carrier phase recovery algorithm to jointly compensate frequency offset and carrier phase noise based on the widely-used Viterbi and Viterbi phase estimation (VVPE) algorithm with reduced computational complexity and hardware resources. An adaptive joint-polarization frequency offset (FO) estimator is proposed in place of the normal one-time FO estimation for better estimation accuracy and reduced system memory requirement. Simulation and experiment results validate the performance superiority of the proposed algorithm against the classic carrier phase recovery algorithms combination.