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通过数值计算,对反常色散平坦光纤中高阶孤子压缩效应产生超连续谱进行了系统、深入的研究.结果表明,反常色散平坦光纤的色散参量二阶微分常量、峰值色散参量及抽运脉冲的脉宽、孤子阶数对该种光纤中平坦超连续谱的形成及所需光纤长度的选取都有着非常重要的影响;进一步研究表明,超连续谱的展宽机理主要来自脉冲的自相位调制效应和群速度色散的共同作用,高阶非线性效应对超连续谱的产生不起决定性作用,在计算中完全可以忽略.
The results show that the second order differential constant, the peak dispersion parameter and the pulse duration of the pump pulse of the anomalous dispersion flattened fiber are systematically and deeply studied. Width and soliton order have a very important influence on the formation of flat supercontinuum in this kind of fiber and the selection of required fiber length. Further studies show that the mechanism of broadening of supercontinuum comes mainly from the pulse self-phase modulation effect and group The combined effect of velocity dispersion and high-order nonlinearity is not critical to the generation of supercontinuum and can be ignored in the calculation.