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Simple characterisation factor for practical single-mode fibres
W.A.Gambling and H.Matsumura
The spot size of the HE11 mode in a practical singlemode fibre mainly depends on the numerical aperture and not on the normalised frequency. An alternative definition of spot size in terms of a matching Gaussian beam is much simpler to use.
Electronics Letters (1977) Vol.13(23) pp.691-693
Copyright University of Southampton 2006