中文摘要：

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1000nm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。

英文摘要：

Supercontinuum generation in dispersion decreasing fiber, with different dispersion profile from general dispersion-flattened/decreasing fiber, has been analyzed and studied in detail, by utilizing numerical simulation based on the total field formulation in the frequency domain. It is found that this scheme can gengerate wider flat ultra-broadened supercontinuum and the flat bandwidth can be up to 1000 nm. It is further found that the effects of group-velocity dispersion and self-phase modulation are the primary factors for the supercontinuum generation, and higher-order nonlinear effects such as self-steepening and stimulated Raman scattering also play an important role in the generation of supereontinuum spectrum.