SBS抑制技术对长距离CATV传输的CSO的影响

上海大学学报(自然科学版)

SBS抑制技术对长距离CATV传输的CSO的影响

顾靓博,王春华，李力

上海大学通信与信息工程学院，上海 200072

收稿日期:2006-11-14 修回日期:1900-01-01 出版日期:2008-02-28 发布日期:2008-02-28
通讯作者: 王春华

Influence of External-Phase Modulation for SBS on Long-Haul 1550 nm AM-VSB CATV Systems

GU Liang-bo,WANG Chun-hua,LI Li

School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China

Received:2006-11-14 Revised:1900-01-01 Online:2008-02-28 Published:2008-02-28
Contact: WANG Chun-hua

摘要/Abstract

摘要： 在EDFA级联放大的长距离CATV系统中，常采用附加相位调制法来抑制光纤中非线性SBS效应，从理论上研究了附加相位调制法在长距离1 550 nm波长对CATV系统CSO的影响.该文采用微扰迭代法求解薛定谔方程推导得出的采用附加相位调制后的系统CSO解析表达.通过对理论研究结果的仿真分析，发现通过调节附加相位调制度或改变相位调制频率，可以在很大程度上改善系统的CSO性能，实现超长距离CATV传输.

关键词: Raman放大, ＳＢＳ抑制, 附加相位调制, 微扰, 自相位调制, 组和二阶失真

Abstract: External phase modulation is usually applied to improve the SBS threshold in long distance EDFA cascaded 1 550 nm externally-modulated AM CATV. In this paper, composite second-order distortion (CSO) performance due to external phase modulation is studied theoretically. First, the external-PM and the self phase modulation (SPM) induced CSO is obtained analytically by solving the Schr-dinger equation with a perturbation method. Numerical results are then presented and discussed. According to the study, the CSO performance can be improved significantly by applying a suitable phase modulation index for any long distance AM-CATV.

Key words:
Raman amplifier,
self phase modulation (SPM), external phase modulation, perturbation, stimulated brillouin scattering (SBS), composite second-order distortion (CSO)

中图分类号:

TN914.83

顾靓博;王春华;李力 . SBS抑制技术对长距离CATV传输的CSO的影响[J]. 上海大学学报(自然科学版).

GU Liang-bo;WANG Chun-hua;LI Li. Influence of External-Phase Modulation for SBS on Long-Haul 1550 nm AM-VSB CATV Systems[J]. Journal of Shanghai University（Natural Science Edition）.

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