First, the relation between the dispersion of the fiber and the propagation constant and equivalent refractive index is presented.

文章先给出了光纤色散与光纤传播常数及等效折射率的关系。

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Then, the dispersion of the multi-clad fiber is obtained by solving the propagation constant and the equivalent refractive index of single-clad fiber which is equal to multi-clad fiber.

通过将多包层光纤等效为阶跃光纤，求等效阶跃光纤的传播常数与等效折射率，求得多包层光纤的色散。

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