Quadrature imbalance compensation algorithm based on statistical properties of signals in CO-QPSK system

被引：5
|
作者：
Qiao, Yaojun [1 ]
Xu, Yanfei [1 ]
Li, Lujiao [1 ]
Ji, Yuefeng [1 ]
机构：
[1] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China
来源：
CHINESE OPTICS LETTERS | 2012年 / 10卷 / 12期
基金：
中国国家自然科学基金;
关键词：
PHASE;
D O I：
10.3788/COL201210.120601
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose a blind quadrature imbalance (QI) compensation algorithm based on the statistical properties of I and Q signals in a receiver. The algorithm estimates the QI parameters of a receiver by calculating the mean, variance, and correlation coefficient of I and Q components. Then, the estimated imbalance parameters are adopted to compensate for the QI in the receiver. Simulation results show that the Q factor is considerably optimized by the application of the QI compensation algorithm in an 80-Gb/s Pol-Mux coherent optical quadrature phase-shift keying (CO-QPSK) system. Compared with conventional algorithms, the proposed algorithm exhibits better performance when the phase deviation from QI exceeds +15 degrees.
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页数：4
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