高阶效应对光纤系统中孤子和艾里脉冲传输特性影响的数值研究

以变系数耦合高阶非线性薛定谔方程为理论模型,采用分步傅里叶方法,讨论了孤子和艾里脉冲在光纤中的传输特性。研究表明三阶色散、自频移和自陡峭效应导致孤子和艾里脉冲所分离出的俘获孤子的中心位置发生偏移,且三阶色散会影响俘获孤子的强度,并讨论了两脉冲的中心位置及强度对艾里脉冲截断系数的依赖关系。

Numerical Study of the Effects of Higher-order Effects on Soliton and Airy Pulse Propagation in Optical Fiber System

Based on the variation coefficient coupled nonlinear Schr(o)dinger equation (CNLS) containing higher-order effects,we studied the propagation properties of soliton and Airy pulse in optical fiber using the split-step Fourier numerical algorithm.It was shown that the center position of the soliton and the trapped soliton is shifted due to the third-order dispersion,self-frequency shift effect and self-steepening effect,and the intensity of the trapped soliton is also affected by third-order dispersion.Furthermore,the central position and intensity of the two pulses are dependent on the truncation coefficient of Airy pulse.