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Coupling to an endfaced multi-clad optical fibre from a misaligned gaussian beam or a separated multi-clad fibre

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Abstract

The excitation of a multi-clad optical fibre by a misaligned gaussian beam is analysed using a least-squares boundary residual modal technique and a Born approximation. The modal technique is used to analyse the axial coupling via a gap between two aligned fibres. Comparison is made with a method based on a gaussian approximation for the fibre fields. Results of the modal technique confirm the accuracy of the Born approximation when corrected for Fresnel reflection. However, the modal technique is more precise than the other methods when serious mismatch exists and is efficient for treating the gap problem, where the Born approximation is not applicable.

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Author notes

  1. H. A. El-Mikati

    Present address: Faculty of Engineering, Mansoura University, Mansoura, Egypt

Authors and Affiliations

  1. Department of Electronic and Electrical Engineering, University College London, Torrington Place, WC1E 7JE, London, UK

    H. A. El-Mikati & J. Brian Davies

Authors
  1. H. A. El-Mikati
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  2. J. Brian Davies
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El-Mikati, H.A., Davies, J.B. Coupling to an endfaced multi-clad optical fibre from a misaligned gaussian beam or a separated multi-clad fibre. Opt Quant Electron 17, 297–309 (1985). https://doi.org/10.1007/BF00620393

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  • DOI: https://doi.org/10.1007/BF00620393

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