Analyse perturbative des caractéristiques de propagation des fibres optiques à gradient d'indice quasi-parabolique

A simple perturbation theory, based on the scalar wave analysis, has been used to study the propagation characteristics of radially inhomogeneous lossless fibres. The formalism has been developed with a truncated parabolic-index profile as the zero-order solution and the perturbation approach is valid for azimuthally symmetric or anti-symmetric modes near cut-off as well as far from cut-off. In addition, numerical calculations have been carried out forα-profiles and have been found to be in good agreement with more rigorous calculations reported by previous authors.

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