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Analytical separation for the TE and TM modes of a two-concentric-core optical fibre

This paper describes the determination of the analytical solution for the TE and TM modes of a two-concentric-core fibre. This fibre, in contrast to the multi-clad one, has a layer where it is assumed that guided modes exist. Based on techniques which are already known and with the aid of computational analytic support, separation of the dispersion equation for the modes TE and TM is achieved.