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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Altintas, A., Love, J.D. Effective cut-offs for modes on helical fibres. Opt Quant Electron 22, 213–226 (1990). https://doi.org/10.1007/BF02189428
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DOI: https://doi.org/10.1007/BF02189428