Quadrature Imbalance Compensation for PDM QPSK Coherent Optical Systems

被引：27
|
作者：
Petrou, Constantinos S. [1 ]
Vgenis, Athanasios [1 ]
Roudas, Ioannis [1 ]
Raptis, Lampros
机构：
[1] Univ Patras, Opt Commun Grp, Dept Elect & Comp Engn, Rion 26500, Greece
来源：
IEEE PHOTONICS TECHNOLOGY LETTERS | 2009年 / 21卷 / 24期
关键词：
Coherent optical communications; quadrature imbalance (QI); quadrature phase-shift keying (QPSK); PSK;
D O I：
10.1109/LPT.2009.2034750
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this letter, we study the impact of quadrature imbalance (QI) on the performance of optical communications systems using polarization-division-multiplexed (PDM) quadrature phase-shift keying (QPSK), with coherent detection and digital signal processing. We compare, via simulation, the performance of three QI compensation algorithms, suitable for PDM QPSK coherent optical receivers, including a novel, blind, adaptive, constrained equalizer, based on the constant modulus algorithm. We show that dedicated QI compensation is mandatory and cannot be substituted by conventional adaptive electronic equalizers designed for intersymbol interference mitigation.
引用
收藏
页码：1876 / 1878
页数：3
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