Title :
Pilot-Assisted Decision-Aided Maximum-Likelihood Phase Estimation in Coherent Optical Phase-Modulated Systems With Nonlinear Phase Noise
Author :
Zhang, Shaoliang ; Li, Xiaojing ; Kam, Pooi Yuen ; Yu, Changyuan ; Chen, Jian
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
fDate :
3/15/2010 12:00:00 AM
Abstract :
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.
Keywords :
error statistics; maximum likelihood estimation; optical modulation; phase noise; phase shift keying; 16-quadrature amplitude modulation format; BER; bit-error-rate; coherent optical M-ary phase-shift-keying systems; coherent optical phase-modulated systems; differential encoding; eight-phase-shift keying systems; laser phase noise; nonlinear phase noise; nonlinear-phase-noise channel; pilot-assisted decision-aided maximum-likelihood phase estimation; quadrature phase-shift keying; $M$-ary PSK; Coherent detection; decision-aided maximum-likelihood (DA ML); differential encoding (DE); laser phase noise; nonlinear phase noise (NLPN); phase estimation (PE); pilot symbols;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2039563
