摘要
为了研究离散效应对光子晶体光纤中飞秒信号脉冲压缩的影响,采用分步傅里叶方法数值求解耦合的非线性薛定谔方程,模拟了双飞秒脉冲在光子晶体光纤中的非线性传输过程;计算和分析了离散效应和非同步耦合对信号脉冲压缩的影响。结果表明,当抽运脉冲在反常色散区进行抽运,而信号脉冲在正常色散区入射时,在群速度色散、3阶色散,自相位调制及交叉相位调制联合作用下,信号脉冲在传输过程中不仅被压缩且存在最佳光纤长度;离散效应导致信号脉冲压缩因子减小,所需最佳光纤长度增加以及压缩后的脉冲频谱呈现不对称,采用非同步耦合有利于改善信号脉冲的压缩质量。
In order to study the influence of pulse walk-off on femtosecond signal pulse compression in photonic crystal fibers, the coupled nonlinear Schrodinger equations were numerically solved by means of standard split-step Fourier method. The nonlinear propagation of two femtoseeond optical pulses in a photonic crystal fiber was simulated. The effect of pulse walk-off and asynchronous coupling on signal pulse compression was simulated and analyzed. It is found that the signal pulse can be compressed through the cooperation by group velocity dispersion, third-order dispersion, self-phase modulation and cross-phase modulation, when the pump pulse is input in the anomalous dispersion region while the signal pulse is input in the normal dispersion region. Pulse walk-off not only leads to the degradation of the compression ratio of the signal pulse but also leads to a longer fiber length at which the width of the compressed signal pulse is the minimum, and leads to the non-symmetry of the compressed signal pulse. It is also found that the quality factor of the signal pulse will be improved with the asynchronous coupling method.
出处
《激光技术》
CAS
CSCD
北大核心
2011年第5期606-609,共4页
Laser Technology
基金
滨州学院科研基金资助项目(Bzxykj0812)
关键词
非线性光学
光子晶体光纤
分步傅里叶方法
离散效应
非同步耦合
nonlinear optics
photonic crystal fiber
split-step Fourier method
effect of pulse walk-off
asynchronous coupling
作者简介
赵荣霞（1980-），女，硕士，助教，主要从事宇宙线物理和光了晶体光纤非线性特性的应用研究。E—mail：zhaorxbzxy@163．com
