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 ±15°.
© 2012 Chinese Optics Letters
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