摘要 互联网的问世，大大的促进了全球通信行业的发展，尤其是最近几年由于电子通讯产品的迅速扩大增多，人们对信息的传输与接收的要求也越来越高，在光纤信息传输系统中，人们追求更大的信道容量、更快的速率以及更精准的接收信息，增大了未来光纤网络系统结构的发展难度。 本文研究的是光传输系统中的三大非线性效应，分别对传统的抑制非线性效应的方案进行改进，具体内容如下： 本文首先理论分析了SPM效应、XPM效应、FWM效应的产生机理及影响因素，首先对传统的色散补偿模块进行了改进，通过Optisystem系统实验仿真，检验色散补偿方案对SPM效应的影响，再对系统改进前后进行对比；其次研究了XPM效应，在理论分析的基础上对XPM进行了仿真，分别研究了不同波长、不同速率、不同信道间隔和不同入纤光功率对系统的影响，并提出抑制XPM的方法；最后研究了FWM效应，对FWM效应的抑制提出了两种方法：（1）算法的改进：对非线性薛定谔方程的算法进行了改进，把固定步长改为可变步长，并用Matlab仿真对比改进前后的变化；（2）对系统搭建过程中信道间隔的改进：对传统的DWDM系统的搭建进行了两种改进，并将这两种信道间隔的改进方案与传统等间隔方案进行对比研究。本文基于大量实验数据，分析并提出了减轻非线性效应对 DWDM 传输系统影响的改进方法，为DWDM 传输系统在高速超长距离传输信号时可发挥作用。 最后，对利用各个非线性效应的产生特点应用于其他领域的可能性提出了展望。希望通过对非线性效应的相关仿真和数据分析能够对 DWDM 系统的配置及工程建设中遇到的问题起到参考作用。

ABSTRACT In the end of 20th Century and the early 21th Century, the appearance of the Internet promotes the global communications industry progress, particularly in recent years due to the rapid development of multimedia, the transmission of data communication industry has higher requirements in the society. The channel capacity and higher transmission rate of the optical fiber backbone transmission network also provide move challenging requirements for the development of optical communication technology. This study is three nonlinear effects in the optical transmission system. Traditional non-linear effect suppression program has been improved, as follows: This paper analyzes the mechanism and influencing factors of SPM effect, XPM effect and FWM effect. First, conventional dispersion compensation module has been improved by Optisystem simulation compared before and after the impact of improved dispersion compensation scheme for the SPM; Then, based on the theoretical analysis of XPM simulation, we studied the effects of different wavelengths, different rates and different optical power into the fiber of the system; Secondly studied FWM effect on the nonlinear Schrodinger equation algorithm has been improved, the fixing step to variable step, and improved results with Matlab simulation, Then the traditional DWDM system has been improved, the design of the two programs and comparative study with traditional methods. I came up with some suggestions of how to overcome the various nonlinearities effects on DWDM communication’s system, these suggestions will be a very useful reference in design high speed and ultra-long haul DWDM communications system and its applications. The final chapter is the conclusion of this paper, it briefly summarizes the paper and gives a prospective vision of the application of nonlinearities effects in DWDM system. I hope this paper will be helpful for DWDM system configuration and engineering problem resolving.