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We propose two phase estimation methods for coherent optical orthogonal frequency-division multiplexing (OFDM) systems, the decision-aided (DA) plus pilot-aided (PA) scheme and DA plus decision feedback (DF) scheme. We further investigate the combinations of DA, PA, and DF in a simulated 40-Gb/s single polarization system. DA+PA helps to increase the phase noise tolerance of DA and reduce the overhead of PA, while DA+DF reduces the overhead to zero and achieves the best performance with one more step of estimation, compensation, and demodulation.
Date of Publication: Nov.15, 2012