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对色散渐减光纤(DDF)构成的马赫-曾德尔干涉仪(MZI)中的孤子效应脉冲压缩进行了数值研究,该方法同时利用了DDF中的高阶孤子压缩和MZI的非线性开关特性。计算结果表明,该方法不仅能获得比DDF绝热压缩大得多的压缩比,而且可以压缩DDF绝热压缩技术所不能压缩的宽脉冲。对于宽度为20ps的输入脉冲,压缩比高达76.4。研究还表明,压缩结果对于MZI的设计误差或输入脉冲峰值功率的波动不敏感;而DDF中的高阶效应(如拉曼自频移和三阶色散)对压缩结果的影响也只有当压缩脉冲短于100fs时才变得不可忽略。
A numerical study of the soliton-effect pulse compression in the Mach-Zehnder interferometer (MZI) with diminished-dispersion fiber (DDF) is presented. This method exploits the high-order soliton compression in DDF and the nonlinear switching characteristics of MZI. The calculation results show that this method can not only obtain a much larger compression ratio than the DDF adiabatic compression, but also can compress the wide pulse which can not be compressed by the DDF adiabatic compression technique. The compression ratio is as high as 76.4 for an input pulse width of 20ps. The study also shows that the compression result is insensitive to the design error of MZI or the fluctuation of the peak power of the input pulse. However, the effect of high-order effects (such as Raman auto-frequency shift and third-order dispersion) on the compression result in DDF is only affected by the compression pulse Shorter than 100fs can not be ignored.