IQ Imbalance Compensation Based on Maximum SNR Estimation in Coherent QPSK Systems

Abstract : We present a simple alternative method for the compensation of quadrature imbalance in optical quadrature phase-shift-keying (QPSK) coherent systems. The method is based on the determination and the compensation of the phase mismatch by the introduction of a relevant signal-to-noise ratio metric. The principle is validated numerically and the algorithm is validated experimentally through bit-error-rate (BER) and error vector magnitude (EVM) measurements. A 20 Gb/s optical QPSK experiment reveals a good agreement of theproposed method with the Gram-Schmidt orthogonalization procedure (GSOP). Moreover, the robustness of both methods was verified with up to 30° phase misalignment by comparing the signal after phase imbalance compensation to that without compensation. A 10% reduction of EVM is achieved with our method for a high phase misalignment of 30°.
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Trung Hien Nguyen, Fausto Gomez Agis, Mathilde Gay, Luiz Anet Neto, Pascal Scalart, et al.. IQ Imbalance Compensation Based on Maximum SNR Estimation in Coherent QPSK Systems. 16th International Conference on Transparent Optical Networks (ICTON 2014), Jul 2014, Graz, Austria. paper Tu.C1.3, ⟨10.1109/ICTON.2014.6876406⟩. ⟨hal-01062978⟩

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