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采用分步傅里叶方法模拟了初始啁啾对光子晶体光纤中超连续谱产生的影响.根据光纤长度,将光子晶体光纤中脉冲的演化分成初始展宽、剧烈展宽和饱和展宽三个阶段.通过讨论啁啾脉冲和无初始啁啾脉冲在各阶段演化的区别,发现啁啾只在初始展宽和剧烈展宽阶段对光谱有影响,当β2C<0时啁啾有利于光谱的展宽,当β2C>0时则刚好相反,在饱和展宽阶段啁啾不再对光谱产生影响.要想利用啁啾脉冲来获得较宽的光谱,必须选择合适的光纤长度,使输出的脉冲处于剧烈展宽阶段.这为利用啁啾脉冲在光子晶体光纤中获得最佳的超连续谱提供了一定的参考依据.
The effect of initial chirp on supercontinuum generation in photonic crystal fiber is simulated by the step-Fourier method.The pulse evolution in photonic crystal fiber is divided into three stages: initial broadening, violent broadening and saturation broadening according to the fiber length. The difference between the chirp pulse and the initial chirped pulse at different stages of evolution shows that the chirp has an influence on the spectrum only in the initial broadening and the intense broadening stage. When β2C <0, the chirp is beneficial to the broadening of the spectrum. When β2C> 0 The opposite is true, and the chirp no longer affects the spectrum during the saturation spread. To obtain a wider spectrum with chirped pulses, the appropriate fiber length must be chosen so that the output pulses are in a sharp broadening phase. The chirped pulse provides some reference for obtaining the best supercontinuum in photonic crystal fiber.