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光子晶体光纤中双脉冲非线性传输的数值分析

, PP. 467-472

Keywords: 非线性光学,光子晶体光纤,分布傅里叶法,交叉相位调制,离散效应,拉曼效应

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Abstract:

采用分布傅立叶方法数值求解耦合的非线性薛定谔方程,模拟了双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脉冲内拉曼散射对信号脉冲传输和压缩的影响。结果表明,当中心波长为800nm的泵浦脉冲在反常色散区进行泵浦,而中心波长为740nm的信号脉冲在正常色散区入射,在群速度色散,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。离散效应不仅导致脉冲压缩比的减小和压缩后峰值功率的降低,而且导致脉冲所需最佳光纤长度的增加以及压缩后的脉冲呈现不对称,还发现,脉冲内拉曼散射有利于改善脉冲压缩质量。

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