Gambling, W.A., Payne, D.N. and Matsumura, H.
Effect of dip in the refractive index on the cut-off frequency of a single-mode fibre
Electronics Letters, 13, (7), . (doi:10.1049/el:19770128).
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The normalised frequency for single-mode cut-off in an optical fibre has been calculated as a function of the dip in the refractive index at the centre of the core. For a particular class of profiles, dip widths up to 40% have a negligible effect on the propagation characteristics.
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