中文摘要：

为了解决在高速率传输过程中,光纤介质的非线性效应及其在波分复用（WDM）系统中光信号造成的严重衰减问题,围绕自相位调制和四波混频两种非线性效应进行分析,采用Opti System模拟软件分析了造成SPM和FWM效应的主要变量因素.结果表明,输入功率、信道间隔以及色散是造成自相位调制和四波混频性能变化的主要原因,通过调整这些参数可以提高光纤传输性能,为进一步优化奠定了基础.

英文摘要：

In order to solve the nonlinear effect of optical fiber medium and the severe attenuation of optical signal in the wavelength division multiplexing（ WDM） system during the high speed transmission process,two nonlinear effects of self-phase modulation（ SPM） and four-wave mixing（ FWM） were analyzed. With the Opti System simulation software,the main variable factors causing the SPM and FWM effects were analyzed. The results show that the input power,channel spacing and chromatic dispersion are the main reasons for the performance change of SPM and FWM. Through adjusting these parameters,the transmission performance of optical fiber can be optimized,which lays the foundation for further optimization.