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

页码：30579 / 30585

页数：7

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