Gambling, W.A., Payne, D.N. and Matsumura, H.
Propagation studies on single-mode phosphosilicate fibres.
In, 2nd European Conference and Exhibition on Optical communication (ECOC), Paris, FR,
27 - 30 Sep 1976.
A method is described for determining unambiguously from the far-field pattern of single-mode fibres the core diameter and the refractive index difference between core and cladding. It involves measurements only of the half-power width of the main lobe and the width of the first minimum. When a single-mode fibre is curved we find that, as expected, the bend loss increases sharply below a critical bend radius but that the radiation does not leak away uniformly with distance. Instead a series of discrete, well-defined rays is observed
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