Gambling, W.A., Payne, D.N., Matsumura, H. and Norman, S.R.
Measurement of normalised frequency in a single-mode optical fibres
Electronics Letters, 13, (5), . (doi:10.1049/el:19770094).
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It is shown that methods of measuring the normalised frequency in single-mode fibres through observation of mode cut-off wavelengths give erroneous results. This is because the various loss mechanisms which exist in a practical fibre can have an appreciable effect near cut-off.
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