DocumentCode :
902395
Title :
Laser Linewidth Tolerance of Decision-Aided Maximum Likelihood Phase Estimation in Coherent Optical 
-ary PSK and QAM Systems
Author :
Zhang, S. ; Kam, P.Y. ; Yu, C. ; Chen, J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
Volume :
21
Issue :
15
fYear :
2009
Firstpage :
1075
Lastpage :
1077
Abstract :
This letter extends the decision-aided (DA) maximum likelihood (ML) phase estimation in an M -ary phase-shift keying (PSK) system to quadrature amplitude modulation (QAM) signals. The block length effect is simulated for both M-ary PSK and QAM systems, and also investigated in M -ary PSK systems through analysis. Our results show that the tolerance of DA ML to laser linewidth for square 16-QAM can be increased by >10 times compared to the block Mth power scheme.
Keywords :
maximum likelihood estimation; optical fibre communication; optical modulation; phase estimation; phase shift keying; quadrature amplitude modulation; QAM system; coherent optical M-ary PSK; decision-aided ML phase estimation; laser linewidth tolerance analysis; maximum likelihood phase estimation; phase-shift keying system; quadrature amplitude modulation; Coherent detection; optical fiber communication;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2009.2022750
Filename :
4957008
Link To Document :
