An accurate calculation of the total dispersion coefficient for a step-index monomode fiber is made and therefrom a comparison of the frequently used approximate approaches for the prediction of dispersion minimum in step-index monomode fibers is made. It is shown that the two approximate approaches due to Gloge [4] and South [10] may lead to significant errors in the prediction of (i) the wavelength X 0 of dispersion minimum and ( ) core diameter required to attain zero total dispersion at a specified wavelength. For typical fiber parameters Gloge's approximation may lead to prediction of λο which is as much as 10% higher than that predicted by our accurate calculation.
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