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New metric for IQ imbalance compensation in optical QPSK coherent systems
Abstract : We report on a simple alternative method for the compensation of quadrature imbalance in optical quadrature phase-shift-keying (QPSK) coherent systems. By introducing a new metric, the phase imbalance can be determined and compensated. The proposed method is theoretically and numerically analyzed. In particular, it is shown that the method exhibits a small bias of estimated phase imbalance value. Thanks to its deterministic property, this bias can be simply compensated by incorporating at the receiver a phase rotator (or phase shift) whose value can be determined based on an analytical analysis. Moreover, the algorithm is also experimentally validated through bit-error-rate and error vector magnitude (EVM) measurements. A good agreement on the performance of the proposed method with that of the Gram–Schmidt orthogonalization procedure is shown in a 20-Gbit/s optical QPSK experiment. The robustness of both methods was verified with up to 30° phase imbalance by comparing the signal with and without phase imbalance compensation. A 10% reduction in EVM is achieved with our method for a high phase imbalance of 30°, while the implementation complexity can be reduced owing to the suppression of the use of square-root operators.
Cited literature [28 references]
https://hal.inria.fr/hal-01941892
Contributor : Olivier Sentieys <>
Submitted on : Wednesday, December 12, 2018 - 11:16:26 AM
Last modification on : Tuesday, January 12, 2021 - 4:51:22 PM
Long-term archiving on: : Wednesday, March 13, 2019 - 2:39:50 PM
Contributor : Olivier Sentieys <>
Submitted on : Wednesday, December 12, 2018 - 11:16:26 AM
Last modification on : Tuesday, January 12, 2021 - 4:51:22 PM
Long-term archiving on: : Wednesday, March 13, 2019 - 2:39:50 PM
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