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Pilot-Assisted Decision-Aided Maximum-Likelihood Phase Estimation in Coherent Optical Phase-Modulated Systems With Nonlinear Phase Noise

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5 Author(s)
Shaoliang Zhang ; Dept. of Electrical and Computer Engineering, National University of Singapore, Singapore ; Xiaojing Li ; Pooi Yuen Kam ; Changyuan Yu
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We proposed pilot-assisted (PA) decision-aided maximum-likelihood (DA ML) phase estimation for coherent optical M-ary phase-shift-keying systems. In a nonlinear-phase-noise channel with laser phase noise, the required launched power at bit-error-rate (BER) =10-4 using the proposed PA DA ML algorithm without differential encoding (DE) can be reduced by about 0.7 dB in quadrature phase-shift keying and eight-phase-shift keying systems, and about 0.4 dB in 16-quadrature amplitude modulation format, compared to their DE counterparts using DA ML.

Published in:

IEEE Photonics Technology Letters  (Volume:22 ,  Issue: 6 )