高阶拟合出光纤模式折射率和波长的关系并计算出较为准确的波导色散，同时计算出材料色散，并最终得到光纤的总色散。(The relationship between the refractive index and the wavelength of the fiber mode is fitted in higher order an the more accurate waveguide dispersion is calculated; the material dispersion is calculated at the same time, and the total dispersion of the fiber is obtained.)