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Effective cut-offs for modes on helical fibres
Authors:Ayhan Altintas  John D. Love
Affiliation:(1) Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey;(2) Optical Sciences Centre, Australian National University, 2601 Canberra, ACT, Australia
Abstract:Every mode of a single-mode or multimode helical fibre is always leaky but, for practical purposes, can be treated as being bound with an effective cut-off wavelength. The leakage loss for each mode is quantified, showing that, for fixed core offset and source wavelength, the cut-off pitch increases with increasing mode order. The value of the cut-off pitch for each mode is in agreement with experimental measurements.
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