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We report on the investigation of an approach for modelling lighttransmission through systems consisting of several jointed optical fibres, inwhich the analytical modelling of the waveguides was replaced by Finite ElementModelling (FEM) simulations. To validate this approach we first performed FEManalysis of standard fibres and used this to evaluate the coupling efficiencybetween two singlemode fibres under different conditions. The results of thesesimulations were successfully compared with those obtained using classicalanalytical approaches, by demonstrating a maximum loss deviation of about 0.4%. Further, we performed other more complex simulations that we compared againto the analytical models. FEM simulations allow addressing any type of guidingstructure, without limitations on the complexity of the geometrical waveguidecross section and involved materials. We propose as example of application themodelling of the light transmitted through a system made of a hollow corephotonic crystal fibre spliced between two singlemode standard optical fibres,and qualitatively compare the results of the simulation with experimentalresults.

Modelling of standard and specialty fibre-based systems using finite element methods