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A numerical study is carried out to compare the two-dimensional (2-D) case and three-dimensional (3-D) case for the modelling of an ion-exchanged glass waveguide. It is shown that different waveguide widths on the photomask correspond to different ion concentration distributions after an annealing process. A numerical example is presented of two waveguide sections with different widths indicates that due to the abrupt change of the waveguide width, a 3-D theoretical model is required for an accurate prediction of the parameters of ion-exchanged glass waveguides. The good agreement between the modelled and measured results proves that the developed 3-D numerical model can be beneficially utilized in the generalized design of optical devices based on ion-exchange waveguides.
Wang, P. et al. (2011) Numerical study of an ion-exchanged glass waveguide using both two-dimensional and three-dimensional models, Optics & Laser Technology. Vol. 43, no. 4, pp. 882-888. doi:10.1016/j.optlastec.2010.10.005