Phase noise tolerance study in coherent optical circular QAM transmissions with Viterbi-Viterbi carrier phase estimation

被引：24
|
作者：
Zafra, Sebastian Ortega [1 ,2 ]
Pang, Xiaodan [1 ]
Jacobsen, Gunnar [1 ]
Popov, Sergei [2 ]
Sergeyev, Sergey [3 ]
机构：
[1] Acreo Swedish ICT AB, Network & Transmiss Lab, SE-16425 Kista, Sweden
[2] Royal Inst Technol KTH, Opt & Photon Div, SE-16440 Kista, Sweden
[3] Aston Univ, Birmingham B4 7ET, W Midlands, England
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 25期
关键词：
DISPERSION EQUALIZATION; BLIND EQUALIZATION; RECOVERY; SYSTEMS; 16-QAM; LASER; CONSTELLATIONS; RECEIVERS;
D O I：
10.1364/OE.22.030579
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present a performance evaluation of a non-conventional approach to implement phase noise tolerant optical systems with multilevel modulation formats. The performance of normalized Viterbi-Viterbi carrier phase estimation (V-V CPE) is investigated in detail for circular m-level quadrature amplitude modulation (C-mQAM) signals. The intrinsic property of C-mQAM constellation points with a uniform phase separation allows a straightforward employment of V-V CPE without the need to adapt constellation. Compared with conventional feed-forward CPE for square QAM signals, the simulated results show an enhanced tolerance of linewidth symbol duration product (Delta vT(s)) at a low sensitivity penalty by using feed-forward CPE structure with C-mQAM. This scheme can be easily upgraded to higher order modulations without inducing considerable complexity. (C) 2014 Optical Society of America
引用
收藏
页码：30579 / 30585
页数：7
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