单模光纤中高阶色散对超高斯光脉冲传播的影响

从光脉冲在光纤中传播所满足的非线性薛定谔方程出发,研究了三阶色散对具有不同啁啾的超高斯脉冲在光纤中传输特性的影响。数值模拟的结果表明,超高斯脉冲的波形演变和高斯脉冲有所不同,不但峰值能量经历了一个上升的阶段,而且拖尾振荡在初始阶段也经历了一个增强———减弱的过程。通过计算还发现,初始啁啾无论正负都会加剧三阶色散的影响,故在三阶色散不能忽略的情况下,通过初始啁啾来补偿色散的方法应该慎用。

Influence of higher-order dispersion on super-Gaussian optical pulse in the single-mode optical fiber

Based on the nonlinear Schrodinger equation used to describe the normalized amplitude evolution in the fiber,the influence of the third-order dispersion on the transmission characteristics of super-Gaussian optical pulse with different chirps in the fiber is studied numerically. The results show that the peak intensity of super-Gaussian optical pulse becomes higher at the beginning,and the tail experiences a process of strengthening,and then weakening,which are different from Gaussian optical pulse. The results also show that the initial chirps will strengthen the influence of the third-order dispersion,so the method to compensate the influence of dispersion by adjusting the initial chirps should be used carefully in the case that the influence of the third-order dispersion can't be ignored.