Abstract
Both a displacement of axis and a change in the refractive index distribution function cause mode coupling to occur between two multimode parabolic-index optical waveguides. This coupling is investigated by the coherent states method and the method of the dynamical symmetry group. Expressions for the mode coupling coefficients are obtained and their relationship to the Franck-Condon factors is emphasized. Recurrence relations for the mode overlap integrals and sum rules for the mode coupling coefficients are presented. An analogue of the Franck-Condon principle for the mode coupling coefficients is formulated. A simple geometric method for finding the most intensively coupled modes is also proposed.
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Krivoshlykov, S.G., Sissakian, I.N. Mode coupling between two connected multimode parabolic-index optical waveguides. Opt Quant Electron 11, 393–405 (1979). https://doi.org/10.1007/BF00619821
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DOI: https://doi.org/10.1007/BF00619821