analytical investigations on carrier phase recovery in dispersion-unmanaged n-psk coherent optical communication systems
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ID: 232466
2016
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Abstract
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.
| Reference Key |
xu2016photonicsanalytical
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|---|---|
| Authors | ;Tianhua Xu;Gunnar Jacobsen;Sergei Popov;Jie Li;Tiegen Liu;Yimo Zhang;Polina Bayvel |
| Journal | pakistan journal of medical sciences |
| Year | 2016 |
| DOI |
10.3390/photonics3040051
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| URL | |
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