高速光纤波分复用系统中偏振模色散研究

【作者】 常怡萍；

【导师】 叶会英；

【作者基本信息】 郑州大学 ， 通信与信息系统， 2004， 硕士

【摘要】 偏振模色散被认为是光纤通信系统传输容量和传输性能的最终限制因素，对偏振模色散的深入认识以及如何消除其影响，是高速率和长距离光纤通信系统发展的一个重要内容。是当前国际上光纤通信领域研究的热点之一。 我国对偏振模色散的研究起步较晚，主要集中于偏振模色散测量方法的研究，以及分析偏振模色散对系统的影响。分析的理论模型限于单信道通信系统，对于波分复用系统中偏振模色散的研究还很少见。基于此本文把研究重点放在波分复用系统中的偏振模色散上，建立了波分复用系统中分析偏振模色散的数学模型，作为分析波分复用系统中偏振模色散的理论前提，为本文后面的仿真工作打下了理论基础。 本文采用分步傅立叶变换法求解耦合非线性薛定谔方程，对偏振模色散进行了数值模拟。通过数值解四波长波分复用系统的耦合非线性薛定谔方程，分析偏振模色散、信道间隔、入射功率对波分复用系统的综合影响，得到如下结论：偏振模色散限制了信道间隔，信道间隔越小，偏振模色散对系统的影响越大；入射功率的大小同样影响偏振模色散对系统作用的效果；另外，本文将孤子传输控制技术——滑频滤波器技术应用于波分复用系统，通过数值仿真，结果表明这种技术可以有效地抑制偏振模色散。 本文提出利用光脉冲传输自身特性抑制偏振模色散的方案，通过分析各种因素引起的啁啾，证实了这种方案的可行性；最后分析了交叉相位调制效应对波分复用系统中一阶偏振模色散补偿的影响。更多还原

【Abstract】 Polarization mode dispersion (PMD) is regarded as a severe, ultimate limitation in optical communication systems. The inner comprehension to it and how to reduce its impacts is a vital subject in the development of high speed and long haul optical communication systems, which has become one hot reach topics of optical fiber communication systems.In China the research on PMD mainly concentrates upon the measurements and the effects on the communication systems, whereas the model to analyze PMD limits in single channel systems and the study of PMD in wavelength-divided-multiplexing (WDM) systems seldom appears in papers. Based on this the thesis emphasizes on PMD in WDM systems. The model to analyze PMD in WDM systems is established, which is the premise of the numerical simulation.In this thesis the coupled nonlinear Schrodinger equation is solved by means of split-step Fourier transform. The coupled nonlinear Schrodinger equation in four-channel WDM system is numerically solved and the effects of PMD on WDM system are analyzed, then the effects of channel separation and input power on WDM systems are analyzed synthetically. Conclusion is that PMD limits the channel separation, the shorter the channel separation, the more the effects, simultaneously input power may affect on the system. In addition, in this dissertation sliding-frequency filter is used in WDM system for the first time, and the numerical simulation shows that this method can restrain PMD effectively.One method is put forward to restrain PMD, i.e. the characters of optical pulse transmission. During optical pulse transmission several factors result in chirp, and the theory of this scheme is explained in physics, the feasibility of this method is also proved. Finally the effect of XPM on first-order PMD compensation in WDM systems is analyzed.更多还原