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Accurate modeling of polarization conversion in single or multiple curved waveguide sections

Using a rigorous full vectorial beam propagation model, based on the versatile finite element scheme, a novel design of polarization converters based on single or multiple curved waveguide sections is presented. The performance of the polarization rotator is evaluated and optimized in terms of the polarization conversion ratio, the device length and the scattering losses. Also, a study of the sensitivity of the device performance, with respect to different fabrication parameters has also been performed.