Adams, M.J., Payne, D.N. and Sladen, F.M.E.
Length-dependent effects due to leaky modes on multimode graded-index optical fibres
Optics Communications, 17, (2), . (doi:10.1016/0030-4018(76)90215-7).
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The radiation losses of tunnelling leaky modes in graded-index optical fibres are calculated theoretically, and it is shown that the near-field intensity profile has a length dependence. Consequently measurements of the near-field intensity distribution do not give the refractive index profile directly, and a correction factor must be applied. We have investigated this factor and find that it depends only on a single normalisation parameter involving fibre length, core radius and normalised frequency. A further use of the correction factor is to determine the total power attenuation due to the loss of leaky modes.
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