Chinese Optics Letters, 2012, 10 (12): 120601, Published Online: Oct. 15, 2012  

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

Author Affiliations
Abstract
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 +-15o.
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Yaojun Qiao, Yanfei Xu, Lujiao Li, Yuefeng Ji. Quadrature imbalance compensation algorithm based on statistical properties of signals in CO-QPSK system[J]. Chinese Optics Letters, 2012, 10(12): 120601.

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