Low-complexity blind in-phase/quadrature imbalance compensation and field-programmable gate array realization for coherent receivers

Cheng Ju; Na Liu; Changhong Li; Zongtao Chi; Zhiguo Zhang; Xue Chen

doi:10.1117/1.OE.57.11.116101

3 November 2018 Low-complexity blind in-phase/quadrature imbalance compensation and field-programmable gate array realization for coherent receivers

Cheng Ju, Na Liu, Changhong Li, Zongtao Chi, Zhiguo Zhang, Xue Chen

Author Affiliations +

Funded by: National Natural Science Foundation of China (NSFC), Beijing University of Posts and Telecommunications, Open Fund of the State Key Laboratory of Information Photonics and Optical Communications through the Beijing University of Posts and Telecommunications

Optical Engineering, Vol. 57, Issue 11, 116101 (November 2018). https://doi.org/10.1117/1.OE.57.11.116101

Abstract

Receiver in-phase/quadrature (I / Q) imbalance caused by imperfect analog receiver front end can rapidly degrade system performance in a coherent optical transmission system. These imbalances, including I / Q gain and phase imbalance, become increasingly important when higher symbol rate, higher modulation order, and low roll-off pulse shape are used. Here, a low-complexity blind equalization algorithm, cascaded phase, and gain imbalance equalizers, is designed to mitigate these interferences. Furthermore, a field-programmable gate array hardware realization with 128-parallel processing units is performed to demonstrate the proposed algorithm in a 32-GBaud 16-quadrature amplitude modulation off-line transmission experiment. Based on the obtained results, the proposed blind I / Q imbalance compensation algorithm can provide very good compensation performance with low logic element consumption, which is more suitable for high order and high baud rate transmission system.

Citation Download Citation

Cheng Ju, Na Liu, Changhong Li, Zongtao Chi, Zhiguo Zhang, and Xue Chen "Low-complexity blind in-phase/quadrature imbalance compensation and field-programmable gate array realization for coherent receivers," Optical Engineering 57(11), 116101 (3 November 2018). https://doi.org/10.1117/1.OE.57.11.116101

Received: 9 July 2018; Accepted: 18 October 2018; Published: 3 November 2018

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