Modes in curved step-index optical fibres

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© The Institution of Electrical Engineers
Published 20/07/2012

Abstract

By using parabolic, instead of circular, cylindrical co-ordinates the field distributions of the natural modes of curved step-index fibres can be described completely, yet simply. The mode caustics corresponding to the geometrical guiding limit of the equivalent rays of curved fibre can be clearly demonstrated. Near-field mode patterns and caustics obtained experimentally are in excellent agreement with the theory.

Inspec keywords: optical waveguide theory; optical fibres

Other keywords: field distributions; natural modes; geometrical guiding limit; curved step index optical fibres; mode caustics; near field mode patterns

Subjects: Fibre optics and fibre waveguides; Waveguide and cavity theory; Fibre optics

References

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      • Lewin, L.: `Radiation from curved dielectric slabs and fibres', IEEE Trans., 1974, p. 718-727
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      • Matsumura, H.: unpublished work
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      • Kapany, N.S.: , Fiber optics, 1967 (Academic Press)
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      • Gloge, D.: `Propagation effects in optical fibres', IEEE Trans., 1975, p. 106-120
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