An exact and fast analytic method based on power series is established to predict the modal field distributions, Petermann-2 spot size, the normalized propagation constant corresponding to fundamental and first higher order mode in graded index fibers with any arbitrary power law profile. The variation of normalized cut-off frequencies of some LP lm modes in graded index fibers with different profile exponents are also shown here and an empirical relation between them is determined. A. R.

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... URY ET AL. 170 Modal Field Distributions of LP 01 and LP 11 Mode The variations of fundamental and first higher order modal fields for various profile functions with normalized radius are shown in Figures 2 a) and (b) .