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Proceedings Paper

Singularity analysis and elimination of CMA in multistage PMD channel model
Author(s): Xinhui Nie; Yan Li; Wentao Du; Haiquan Cheng; Jian Wu; Wei Li; Jintong Lin; Jianxin Lu; Jian Xu; Guoyi Zhang; Huihong Luo
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Paper Abstract

Polarization-division-multiplexed(PDM) optical coherent systems is considered a promising technique for next generation optical networks. With coherent detection, various impairments in the optical transmission system can be compensated by using digital signal processing (DSP) in the electrical domain. Constant modulus algorithm (CMA), due to its simplicity and immunity to phase noise, has been widely used to demultiplex polarizations and compensate received signals. On the other hand, CMA suffers from the singularity problem which results from Polarization- Dependent-Loss (PDL) and the less sensitivity in phase of CMA. Although many people have researched the singularity problem of CMA both in theory and experiments (modify CMA to avoid singularity problem), their theoretical channel model only contains fiber birefringence and does not consider the situation of multistage channel model which is used in long distance transmission system. Then we analyse the performance of CMA in the channel with multistage channel model through simulation. We change the initial tap of the traditional CMA which can achieve correct polarization demultiplexing without singularity in one stage channel model. But it is not very suitable in multistage channel model. We analysed singularity ratio in long distance transmission system. The simulation results play an active role in following research on singularity problem and the performance of CMA.

Paper Details

Date Published: 5 August 2015
PDF: 7 pages
Proc. SPIE 9619, 2015 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 96190H (5 August 2015); doi: 10.1117/12.2193096
Show Author Affiliations
Xinhui Nie, Beijing Univ. of Posts and Telecommunications (China)
Yan Li, Beijing Univ. of Posts and Telecommunications (China)
Wentao Du, Beijing Univ. of Posts and Telecommunications (China)
Haiquan Cheng, Beijing Univ. of Posts and Telecommunications (China)
Jian Wu, Beijing Univ. of Posts and Telecommunications (China)
Wei Li, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)
Jianxin Lu, Fiberhome Telecommunication Technologies Co., Ltd. (China)
Jian Xu, Fiberhome Telecommunication Technologies Co., Ltd. (China)
Guoyi Zhang, China Southern Power Grid Co., Ltd. (China)
Huihong Luo, China Southern Power Grid Co., Ltd. (China)


Published in SPIE Proceedings Vol. 9619:
2015 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing
Yi Dong; Chao Lu; Jian Wu; Zhaohui Li, Editor(s)

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