Abstract
Faster than Nyquist optical communication system recently attracts more and more attentions because of its higher spectral efficiency than ordinary Nyquist systems. In this work, we propose a modified-Viterbi and Viterbi phase estimation (VVPE) carrier phase recovery (CPR) scheme which shows an effective capability of reducing the cycle slips induced by inter-symbol interference (ISI) in a fast-than-Nyquist (FTN) optical coherent communications system. In a 28-Gbaud FTN polarization-division multiplexed (PDM)-QPSK optical communication system, the comparison of the proposed modified-VVPE scheme and the conventional VVPE scheme is carried out. It is proved that the proposed modified-VVPE scheme can effectively overcome error carrier phase estimation, which leads to a better BER performance.
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