摘要
光孤子传输中的高阶色散以及高次非线性效应是光纤通讯发展的重要制约因素。从光孤子在光纤中的一般传输方程出发,在较大的入纤功率的前提下,综合考虑了高阶色散、五次非线性和损耗因素,得到其具体传输方程,并据此从理论上分析了高阶色散和非线性对光孤子传输性能的影响。本文采用分步傅里叶方法,以MATLAB为实现工具,实现高阶色散和非线性对光孤子传输影响的模拟计算,并深入分析了高阶色散和非线性导致的孤子脉冲频移现象。计算结果表明:在入射功率较大的时候,高阶色散效应不可忽略。当五次非线性2γ>0时,孤子脉冲主峰发生微小频移;而当五次非线性2γ<0时,孤子脉冲主峰基座产生微小频移;当高阶色散3β>0时频率出现红移,而当3β<0时,频率出现蓝移。
The effect of high-order dispersion and high-order nonlinearity are always the key restriction factors of the optical soliton transmission in the optical fiber communication systems. In this paper, based on the ideal ground state optical soliton transmission equation, and higher incoming optical fiber power is assumed, the optical soliton transmission equation is obtained by combining the factors of the fifth-order nonlinear, high-order dispersion and loss. The effect of high-order dispersion and nonlinearity on optical soliton transmission was investigated theoretically. By using the split-step Fourier transform method and the computer code written in Matlab, simulation of the effect of high-order dispersion and nonlinearity on the optical soliton transmission was implemented, and the frequency shift of the optical soliton pulse was investigated intensively. It is shown that the high-order effect can not be ignored as the incident power is comparable high. There is a small frequency shift at the highest peak pulse as high-order nonlinearity γ2〉0. While high-order nonlinearity γ2〈 0 , there is a small frequency shift at the pedestal of the highest peak pulse. Red shift frequency occurs as high-order dispersion β3〉 0 , and while blue shift frequency occurs as high-order dispersion β3 〈0.
出处
《光散射学报》
北大核心
2009年第2期115-120,共6页
The Journal of Light Scattering
关键词
高阶色散
分步傅里叶方法
光孤子
high-order dispersion
split-step Fourier transform method
optical soliton
