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We study the polarization properties of elliptical femtosecond-laser-writtenwaveguides arrays. A new analytical model is presented to explain the asymmetryof the spatial transverse profiles of linearly polarized modes in thesewaveguides. This asymmetry produces a polarization dependent couplingcoefficient, between adjacent waveguides, which strongly affects thepropagation of light in a lattice. Our analysis explains how this effect can beexploited to tune the final intensity distribution of light propagated throughthe array, and links the properties of a polarizing beam splitter in integratedoptical circuits to the geometry of the waveguides.

Analytical model for waveguide light propagation and applications