One of the factors which limits the transmission capacity of the fiber optics communication channel is the material dispersion. Exact analytical study of the material dispersion is often complex and involves calculating the derivatives of the refractive index of the core. These calculations are too cumbersome to do, especially for high-order derivatives. So material dispersion has only been studied analytically in certain circumstances and with many simplifying assumptions. One of the best of such studies was done by Marcuse [10-12]. In this article, a new algorithm is presented which can be used to determine material dispersion more precisely. In this new approach, there is no need for simplifying assumptions and unlike the method in [10-13], it can be used for all kinds of optical sources.

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