An integral expression is derived for the fields in parabolic-index waveguides with distorted optical axis. It is based on well-known ray matrix techniques and generalized Huygens integrals. The distortions give rise to beam oscillations which in turn are identified as the excitation mechanism for radiation modes. The model gives some better understanding of the transition regions between waveguides.
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On leave from the Department of Electronics onthe Weizmann Institute of Science, Rehovot, Israel
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Hardy, A. Beam propagation through parabolic-index waveguides with distorted optical axis. Appl. Phys. 18, 223–226 (1979). https://doi.org/10.1007/BF00885506