scholarly journals Nonlinearity and Phase Noise Mitigation Using Feed-forward Carrier Phase Estimation and Digital Backward Propagation in Coherent QAM Transmission

2014 ◽  
Vol 56 ◽  
pp. 1353-1357 ◽  
Author(s):  
Lalitha Pakala ◽  
Bernhard Schmauss
Keyword(s):  
Phase Noise ◽  
Carrier Phase ◽  
Phase Estimation ◽  
Noise Mitigation ◽  
Feed Forward ◽  
Backward Propagation

scholarly journals Low-complexity feed-forward carrier phase estimation for M-ary QAM based on phase search acceleration by quadratic approximation

2015 ◽  
Vol 23 (15) ◽  
pp. 19142 ◽  
Author(s):  
Meng Xiang ◽  
Songnian Fu ◽  
Lei Deng ◽  
Ming Tang ◽  
Perry Shum ◽  
...  
Keyword(s):  
Carrier Phase ◽  
Low Complexity ◽  
Quadratic Approximation ◽  
Phase Estimation ◽  
Feed Forward

scholarly journals Nonlinear mitigation using carrier phase estimation and digital backward propagation in coherent QAM transmission

2012 ◽  
Vol 20 (26) ◽  
pp. B405 ◽  
Author(s):  
Chien-Yu Lin ◽  
Rameez Asif ◽  
Michael Holtmannspoetter ◽  
Bernhard Schmauss
Keyword(s):  
Carrier Phase ◽  
Phase Estimation ◽  
Backward Propagation

scholarly journals Analytical Investigations on Carrier Phase Recovery in Dispersion-Unmanaged n-PSK Coherent Optical Communication Systems

2016 ◽  
Author(s):  
Tianhua Xu ◽  
Gunnar Jacobsen ◽  
Sergei Popov ◽  
Jie Li ◽  
Tiegen Liu ◽  
...  
Keyword(s):  
Phase Noise ◽  
Carrier Phase ◽  
Communication Systems ◽  
Lms Algorithm ◽  
Noise Variance ◽  
Phase Recovery ◽  
Feed Forward ◽  
The One ◽  
Effective Phase ◽  
Normalized Lms

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.

Multi-stage feed-forward optical carrier phase estimation based on QPSK partitioning for 64-QAM signals

Optik ◽  
2013 ◽  
Vol 124 (16) ◽  
pp. 2557-2560 ◽  
Author(s):  
Fangzheng Zhang ◽  
Jian Wu ◽  
Yan Li ◽  
Kun Xu ◽  
Jintong Lin
Keyword(s):  
Carrier Phase ◽  
Phase Estimation ◽  
Optical Carrier ◽  
Feed Forward ◽  
Multi Stage
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