中文说明：
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。
English Description：
Higher-order fitting out optical fiber mode refractive index and the relationship between the wavelength and calculate the more accurate waveguide dispersion, calculate the material dispersion at the same time, and eventually get the total dispersion of the fiber.