Gambling, W.A., Payne, D.N. and Matsumura, H.
Mode excitation in a multimode optical-fibre waveguide
Electronics Letters, 9, (18), . (doi:10.1049/el:19730303).
For normal incidence of a Gaussian beam on a multimode optical fibre, theory predicts that only HE(1m) modes are excited, and this is confirmed experimentally for a liquid-core fibre of normalised frequency v = 125. Discrete-mode propagation is observed, indicating that the amount of mode conversion due to fibre imperfections is thus very small.
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