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An alternative approach that directly obtains the dispersion equation for each mode of a multilayered integrated optic waveguide is presented. The form of the dispersion equation can be easily numerically implemented; the presence of a single solution greatly simplifies the roots finding. This new approach does not present any limitation even dealing with almost degenerate modes, with leaky or lossy structures.
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Marantonio et al. (1990) studied this question.
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