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A method based on ray-optics techniques is used to evaluate the dispersion characteristics of a symmetrical-slab waveguide with an index distribution that varies from a quasi-parabolic to the quasi-step profile. The validity and accuracy of the method are checked by comparison with results that can be obtained by different methods, either for the cases of a particular graded index or for a step-index profile.
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Scheggi et al. (1975) studied this question.
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