A variational analysis of single mode graded-index fibers

A variational method is presented to obtain the transverse electric field and the propagation constant of the fundamental mode of weakly guiding graded-index fibers. A comparison has also been made with results obtained by using other approximate methods and it has been shown that the present method gives extremely accurate results (in comparison to other methods) in the practical region of single mode operation and does not involve much computational effort.

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