Abstract
In this paper, a simple and robust pilot-aided carrier phase estimation scheme with a modified phase unwrapping is proposed. The principle of the proposed phase unwrapping is shown with a step-by-step procedure. Further, we test the post-FEC BER performance for the pilot-aided carrier phase estimation scheme with the traditional and proposed phase unwrapping. For the proposed phase unwrapping, a cycle slip rate reduction of about 10 times is achieved than the case using the traditional phase unwrapping through simulations in the presence of Wiener phase noise. Finally, we present a 2.2 Eb/N0 gain and post-FEC error-free performance with only 0.78 % pilot overhead in a 32-Gbaud QPSK system using soft-decision forward error correction.
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Acknowledgments
This work was partly supported by 863 program 2013AA014202,2015AA015503, NSFC program 61475022, 61331008, fund of State Key Laboratory of Information Photonics and Optical Communications (BUPT), the fundamental research funds for the central universities, and the research project G-SB38 of the Hong Kong Polytechnic University.
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Cheng, H., Chen, H., Li, Y. et al. Post-FEC performance evaluation of coherent QPSK system with an enhanced pilot-aided CPE scheme. Photon Netw Commun 32, 230–235 (2016). https://doi.org/10.1007/s11107-016-0630-7
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DOI: https://doi.org/10.1007/s11107-016-0630-7