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提出了色散渐减光纤的一种新型色散分布模型。从频域的全场方程出发,利用数值计算对该种光纤中超连续谱的产生进行了比较深入的分析和研究。研究表明,该种光纤相比常规色散平坦渐减光纤可以产生更宽的平坦、超宽超连续谱,其平坦谱宽可达1000 nm以上。进一步研究表明,超连续谱的形成主要源自于光纤的自相位调制和各阶群速度色散的共同作用,同时自陡峭、受激拉曼散射等高阶非线性效应对超连续谱的形成也有着非常重要的影响。
A new dispersion distribution model of dispersion-decreasing fiber is proposed. Based on the full field equation in the frequency domain, the numerical analysis is used to analyze and study the generation of supercontinuum in this type of fiber. The results show that this kind of fiber can produce a wider flat and super-wide supercontinuum than the conventional flattened tapered fiber, and its flat spectral width can reach more than 1000 nm. Further studies have shown that the formation of supercontinuum is mainly due to the self-phase modulation of optical fiber and the combined effect of the various groups of velocity dispersion, and the formation of supercontinuum by high-order nonlinear effects such as steep and stimulated Raman scattering Very important impact.