Space optical communication DSP simplification scheme based on ICC and CMA

Libo Zhu; Cheng Ju; Zhiguo Zhang; Sheping Shi; Xingang Huang; Yong Ma

doi:10.1117/12.2518286

14 February 2019 Space optical communication DSP simplification scheme based on ICC and CMA

Libo Zhu, Cheng Ju, Zhiguo Zhang, Sheping Shi, Xingang Huang, Yong Ma

Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 1104805 (2019) https://doi.org/10.1117/12.2518286
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

Compared with the fiber channel, the changes of polarization state and the channel characteristics of the two polarization states are relatively slowly in space optical communication channel. At the same time, there have no serious PMD effect in the atmosphere. Because of the relative stability of polarization states in space optical communication systems, we propose and experimentally validate a method that performs low-speed polarization de- multiplexing processing first, and then performs low-speed linear channel equalization for each polarization channel in the DSP process. While the polarization de-multiplexing is realized by ICC algorithm, and the channel equalization is realized by CMA. What’s more, the tap coefficients of ICC algorithm and CMA are able to update by processing the received information sequence in low speed with low-speed logic cells in this method. Therefore, the advantage of this method is that the logic resource consumption in hardware implementation will be reduced by reuse of the low-speed logic cells during FPGA processing while the ICC algorithm and CMA are running. In order to verify the effectiveness of the scheme, we build a communication system that 20-GBd PM-QPSK signals are sent at the transmit-side, and a coherent receiver with local oscillator at the receive-side. By analyzing the constellation diagram and comparing the BER after the ICC algorithm and CMA processing with that after CMA processing, we know that this method simplifies the DSP effectively without significant impact on communication quality.

Citation Download Citation

Libo Zhu, Cheng Ju, Zhiguo Zhang, Sheping Shi, Xingang Huang, and Yong Ma "Space optical communication DSP simplification scheme based on ICC and CMA", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 1104805 (14 February 2019); https://doi.org/10.1117/12.2518286

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KEYWORDS

Polarization

Digital signal processing

Optical communications

Telecommunications

Oscillators

Logic

Receivers

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