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采用一种在色散位移光纤反常色散区产生平坦超宽超连续谱的方法。利用数值计算对色散位移光纤反常色散区高阶孤子压缩效应产生超连续谱展开了全面、深入的研究。结果表明 ,在色散位移光纤的反常色散区色散斜率 (三阶色散 )对超连续谱的形成起着决定性的作用 ;进一步研究表明 ,抽运脉冲的峰值功率及脉宽对超连续谱的谱宽和平坦度都有着重要影响 ,而高阶非线性效应对超连续谱产生没有显著影响。综合考虑以上因素 ,超续谱的谱宽和平坦度可以获得最大的优化。
A method of generating flat super-wide supercontinuum in the dispersion-shifted fiber anomalous dispersion region is used. The numerical calculation is used to study the high-order soliton compression effect in the dispersion-shifted fiber anomalous dispersion region and the supercontinuum generation. The results show that the chromatic dispersion slope (third-order dispersion) in the anomalous dispersion region of dispersion-shifted fiber plays a decisive role in the formation of supercontinuum. Further studies show that the peak power and pulse width of the pump pulse have a significant effect on the spectral width of the supercontinuum And flatness have a significant impact, while the high-order nonlinear effects on supercontinuum generation had no significant effect. Taking the above factors into consideration, the spectral width and flatness of the ultra-spectrum can obtain the maximum optimization.