啁啾对飞秒脉冲在光子晶体光纤中传输的影响  

Influence of chirp on transmission of femtosecond laser pulse in photonic crystal fiber

作　　者：甄海龙[1] 李曙光[1] 刘司英[1] 侯金钗[1] 

机构地区：[1]燕山大学理学院,河北秦皇岛066004

出　　处：《燕山大学学报》2009年第1期63-67,共5页Journal of Yanshan University

摘　　要：采用广义非线性薛定谔方程描述啁啾对飞秒脉冲在光子晶体光纤中传输特性的影响,利用对称分步傅里叶方法通过求解方程,数值计算了有无啁啾情况下相同脉宽和功率、不同入射波长飞秒脉冲在光子晶体光纤中的传输,对比不同色散区飞秒脉冲波形的演化及超连续谱的产生。结果表明,较低功率时,反常色散区和零色散区,初始啁啾对于孤子的快速形成和传输具有重要的作用,而位于正常色散区时,啁啾破坏了脉冲形状,不利于脉冲的传输。反常色散区和正常色散区啁啾有利于频谱的展宽;零色散区,啁啾对频谱展宽影响不明显。较高功率时,频谱展宽主要受功率影响,啁啾对频谱展宽作用不大。这些结论对于脉冲传输和超连续谱系统优化设计和控制具有理论指导意义。The generalized nonlinear Schr6dinger equation is adopted to describe the influence of chirp on transmission characteristics of femtosecond laser pulse in photonic crystal fiber, and solved by symmetry split-step Fourier method. The propagating of ultra-short pulse with the same input pulse width and power, different incident wavelength are simulated in the case of chirp and non-chirp. The pulse profile evolution and the generation of super-continuum spectrum are analyzed in the different dispersion regions. The result shows that, in the case of low power, it is important for the chirp to form the soliton and transmit in the abnormal and zero dispersion area, but it＇s bad for the pulse＇s transmission in normal dispersion. It＇s good for chirp to broad spectrum in normal and abnormal dispersion area, but not evidence in zero dispersion. In the case of high power, the spectrum broading is affected by power, little influence on chirp. These conclusions have important theory guidance significance for the transmission of the pulse, the optimize design and control of the super-continuum.

关 键 词：光子晶体光纤 飞秒激光脉冲 啁啾 分布傅里叶方法 超连续谱 

分 类 号：O431[机械工程—光学工程]