高非线性色散平坦光子晶体光纤的理论研究和数值模拟

利用全矢量等效折射率模型计算了空气孔间距、空气穴半径、空气填充率对非线性系数以及色散特性的影响,通过计算发现空气填充率主要影响色散曲线的形状和变化趋势，孔距A主要影响具体的数值大小，调整孔距可以改变曲线零点的位置。非线性系数随空气穴半径r的增大而增大，随孔距A增大而减小，当空气填充率一定时，即孔距A和半径r同时增大时，非线性系数却是减小的，这说明空气穴节距对非线性系数起主要作用, 最终设计出了几种不同特性的820nm处高非线性色散平坦光子晶体光纤。

Theoretical research and value simulation on high nonlinearity and flattened dispersion of photonic crystal fibers

A vector effective index model is used to analyze the effect of the air hole-to-hole spacing and air-filling fraction of cladding on the nonlinear coefficient and waveguide dispersion. Based on the theoretical calculation, the dependence of the tendency of dispersion curve on the air-filling index and the hole-to-hole spacing as a function of spacing dispersion curve are presented. If air-filling index is constant, nonlinear coefficient decreases with the increase of air hole-to-hole spacing and radius. So it is possible to design photonic crystal fiber around 820nm due to the importance of the air hole-to-hole spacing.