本文通过理论计算,给出了带有初始啁啾的超高斯脉冲由于SPM影响所致的频谱表达式。在此表达式的基础上,利用数值模拟的办法,对照分析了初始啁啾对超高斯脉冲频谱演变的影响。研究结果表明:初始啁啾非常明显的影响超高斯脉冲的频谱,初始正啁啾加剧频谱展宽,初始负啁啾减小频谱展宽。可见,引入初始负啁啾有利于优化超高斯脉冲传输系统的性能。
The spectra expression of chirp super-Gaussian pulse resulting in self-phase modulation is theoretical derived.The Influence of initial chirp on the spectra s evolution of super-Gaussian pulse is analyzed using numerical simulation on the basis of theoretical expression.The research result shows:the spectra of super-Gaussian pulse are obvious influenced by initial chirp,and the positive and negative initial chirp increase and decrease the broadening of spectra,respectively.So,the performance of transmission system cam be optimicared by intrndueing the initial negative chirp when super - Gaussian pulse transmitting in fiber.