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We present a complete analysis of power exchange in multiple coupled waveguides, using the modified scalar coupled-mode theory and give generalized expressions for power exchange between any two waveguides of a multiple-waveguide system. We thus obtain a reciprocity principle applicable to power exchange between any two waveguides. Completely generalized and accurate analytical expressions for all coupling coefficients, all perturbation correction terms, and all nonorthogonality terms involved in the analysis are presented.
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Srivastava et al. (1996) studied this question.
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