2016/08/22 by Tianhua Xu, Gunnar Jacobsen, Xu, Tianhua +11
Engineering · Physics and Astronomy · #94A12 #Advanced Fiber Laser Technologies #Advanced Photonic Communication Systems #C.2.5 #FOS: Computer and information sciences #Information Theory (cs.IT) #Optical Network Technologies
paper · pdf · doi:10.48550/arxiv.1608.06244
openalex publication_date 2016/08/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Using coherent optical detection and digital signal processing, laser phase noise and equalization enhanced phase noise can be effectively mitigated using the feed-forward and feed-back carrier phase recovery approaches. In this paper, theoretical analyses of feed-back and feed-forward carrier phase recovery methods have been carried out in the long-haul high-speed n-level phase shift keying (n-PSK) optical fiber communication systems, involving a one-tap normalized least-mean-square (LMS) algorithm, a block-wise average algorithm, and a Viterbi-Viterbi algorithm. The analytical expressions for evaluating the estimated carrier phase and for predicting the bit-error-rate (BER) performance (such as the BER floors) have been presented and discussed in the n-PSK coherent optical transmission systems by considering both the laser phase noise and the equalization enhanced phase noise. The results indicate that the Viterbi-Viterbi carrier phase recovery algorithm outperforms the one-tap normalized LMS and the block-wise average algorithms for small phase noise variance (or effective phase noise variance), while the one-tap normalized LMS algorithm shows a better performance than the other two algorithms for large phase noise variance (or effective phase noise variance). In addition, the one-tap normalized LMS algorithm is more sensitive to the level of modulation formats.