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Limitations in the perturbation analysis of bent finite-clad fibres and waveguides

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Abstract

The transverse shift in the field distribution and the correction to the propagation constant of the fundamental and symmetric cladding modes on bent finite-clad single-mode fibres and slab waveguides are evaluated from perturbation theory for effective index values extending below the cladding index. Analytical results are derived in both geometries for the step-profile that are valid within the overall limitations of the theory. However, it is found that, for the fibre geometry only, the method breaks down at certain discrete wavelengths because of degeneracies that occur between the HE12 (LP02) and TE01 (LP11) mode propagation constants.

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Authors and Affiliations

  1. Department of Mathematics, University College (UNSW) Australian Defence Force Academy, 2600, Canberra, ACT, Australia

    S. J. Garth

  2. Department of Electronic Engineering, La Trobe University, 3083, Bundoora, Victoria, Australia

    W. M. Henry

  3. Optical Sciences Centre, Australian National University, 0200, Canberra, ACT, Australia

    J. D. Love

Authors
  1. S. J. Garth
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  2. W. M. Henry
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  3. J. D. Love
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Garth, S.J., Henry, W.M. & Love, J.D. Limitations in the perturbation analysis of bent finite-clad fibres and waveguides. Opt Quant Electron 27, 15–33 (1995). https://doi.org/10.1007/BF00431030

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  • DOI: https://doi.org/10.1007/BF00431030

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