, Volume 10, Issue 4, pp 341-351

A universal tunnelling coefficient for step- and graded-index multimode fibres

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A single expression is presented for the power transmission coefficient of both step- and graded-index fibres, which is uniformly valid for all weakly tunnelling and refracting rays. Its accuracy is demonstrated in a comparison of the corresponding power attenuation coefficient for the step-index fibre with solutions to the electromagnetic boundary value problem.