Modes in curved step-index optical fibres

Abstract

By using parabolic, instead of circular, cylindrical coordinates 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 a curved fibre can be clearly demonstrated. Near-field mode patterns and caustics obtained experimentally are in excellent agreement with the theory.

Electronics Letters (1977) Vol.13(18) pp.532-535

doi: 10.1049/el:19770384

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