基于数字相干叠加的相干光正交频分复用系统中光纤非线性容忍性研究

陈雪梅; 张静; 易兴文; 曾登科; 杨合明; 邱昆

doi:10.7498/aps.64.144203

摘要

光正交频分复用系统中的光纤非线性效应制约着系统进一步的扩容. 针对此问题, 提出一种数字相干叠加的方法, 用于提高相干光正交频分复用系统对光纤非线性的容忍性. 仿真中, 5通道的波分复用下偏振复用相干光正交频分复用系统的每个通道传输四进制正交振幅调制映射的71.53 Gbit/s信号在光纤中传输400 km. 首先, 通道间隔为25 GHz, 与传统相干光正交频分复用系统相比, 色散补偿前后, 使用数字相干叠加的相干光正交频分复用系统的信噪比分别提升了6.02 dB和9.05 dB, 最佳入纤光功率均增大了2 dB; 其次, 通道间隔为50 GHz, 色散补偿前后, 信噪比分别提升了4.9 dB和8.75 dB. 通过理论推导及仿真, 验证了所提方法能有效消除相干光正交频分复用系统的一阶非线性失真, 进而提高系统对光纤非线性的容忍性.

关键词:

Abstract

Fiber nonlinearity of optical orthogonal frequency division multiplexed (OFDM) system restricts the capacity improvement of optical fiber transmission. In this paper, we propose a novel digital coherent superposition (DCS) scheme to improve the tolerance to fiber nonlinearity in a coherent optical orthogonal frequency division multiplexed system. In simulation, 71.53 Gbit/s orthogonal frequency division multiplexed signal per channel with Hermitian symmetry is transmitted over 400 km standard single mode fiber in a wave division multiplexed-polarization-division multiplexed-coherent optical orthogonal frequency division multiplexed system with five channels. The 4-quadrature amplitude modulation is used for symbol mapping. For the receiver, after the conventional OFDM signal processing, we conduct DCS for OFDM subcarrier pairs, which requires only conjugation and summation in the x, y polarization direction, respectively. Firstly, the channel spacing is 25 GHz, the maximum signal-to-noise ratio improvement is 9.05 dB or 6.02 dB with or without symmetric dispersion compensation compared with a conventional orthogonal frequency division multiplexed system. The optimum launch power is increased by 2 dB. Secondly, the channel spacing is changed to 50 GHz to investigate the nonlinearity tolerance at different channel spacings in the wave division multiplexed system, the maximum signal-to-noise ratio improvement is 8.75 dB or 4.9 dB with or without symmetric dispersion compensation, respectively. Theoretical and simulation analysis show that the proposed method in this paper can effectively mitigate the first-order nonlinear distortions and hence improve the tolerance of coherent optical orthogonal frequency division multiplexed system with different channel spacings to fiber nonlinear effects.

Keywords:

optical communication /
optical orthogonal frequency division multiplexed /
digital coherent superposition /
fiber nonlinearity

作者及机构信息

1.
电子科技大学通信与信息工程学院, 光纤传感与通信教育部重点实验室, 成都 611731

基金项目: 国家高技术研究发展计划(批准号: 2013AA01340, 2012AA011302, 2012AA011304)、国家自然科学基金(批准号: 61405024, 61107060, 61405024)和中央高校基本科研业务费专项资金(批准号: ZYGX2014J004)资助的课题.

Authors and contacts

1.
Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, School of Communication and Information Engineering, University of Electronic science and Technology of China, Chengdu 611731, China

Funds: Project supported by the National High Technology Research and Development Program of China (Grant Nos. 2013AA01340, 2012AA011302, 2012AA011304), the National Natural Science Foundation of China (Grant Nos. 61405024, 61107060, 61405024), and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. ZYGX2014J004).

参考文献

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施引文献

[1]	Shieh W, Yi X W, Tang Y 2005 Electron. Lett. 43 183
[2]	Lowery A J, Du L, Armstrong J 2006 Proceedings of Optical Fiber Communication Anaheim, CA USA, March 5-10, 2006 PDP39
[3]	Jansen S L, Morita I, Schenk C W, Takeda N, Tanaka H 2008 Lightw. Technol. 26 6
[4]	Qian D, Huang M, Ip E, Huang Y, Shao Y, Hu J, Wang T 2011 Proceedings of Optical Fiber Communication Los Angeles, CA USA, March 6-11, 2011 PDPB5
[5]	Dai F, Yang B J 2005 Physics 34 450 (in Chinese) [戴峰, 杨伯君 2005 物理 34 450]
[6]	Jansen S L, Al Amin A, Takahashi H, Morita I, Tanaka H 2009 IEEE Photon. Technol. Lett. 21 802
[7]	Wang R M, Wang X P, Wu Z K, Yao X, Zhang Y Q, Zhang Y P 2014 Chin. Phys. B 23 054209
[8]	Mitra P P, Stark J B 2001 Nature 411 1027
[9]	Essiambre R J, Foschini G J, Kramer G, Winzer P J 2008 Phys. Rev. Lett. 101 163901
[10]	Shieh W, Chen X 2011 IEEE Photon. J. 3 158
[11]	Roberts K, Li C D, Strawczynski L, O’Sullivan M, Hardcastle I 2006 IEEE Photon. Technol. Lett. 18 403
[12]	Mateo E F, Zhu L, Li G 2008 Opt. Express 16 16124
[13]	Liu X, Chraplyvy A R, Winzer P J 2013 Nature Photon. 7 560
[14]	Yi X W, Yang Q, Qiu K 2013 Asia Communications and Photonics Conference Beijing, China, November 12-15, 2013 AF2F. 76
[15]	Yi X W, Chen X M, Dinesh S, Li C, Luo M, Yang Q, Li Z H, Qiu K 2014 Opt. Express 22 13454
[16]	Louchet H, Hodzic A, Petermann K, Robinson A, Epworth R 2005 IEEE Photon. Technol. Lett. 17 2089
[17]	Yi X W, Shieh W, Tang Y 2007 IEEE Photon. Technol. Lett. 19 919

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