, Volume 17, Issue 3, pp 201-205

Perturbation of a LP mode of an optical fibre by a quasi-degenerate field: a simple formula

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Abstract

A very simple formula is given for the perturbation of a LPon mode of a circular fibre by a quasidegenerate field. Similar formulae, but less simple, are given for higher LPmn modes in circular fibres or for LP modes of non-circular fibres. Some straightforward applications are given.