Full vectorial finite element modeling of novel polarization rotators

In this paper, the numerically efficient finite element based full vectorial modal and propagation approaches are used in order to analyze and design single and multiple sectioned passive polarization rotators (PRs). The effects of different waveguide parameters, such as the waveguide width, etching depth, sidewall slant angle and refractive index contrast on the PR performance in terms of polarization conversion efficiency, section length and losses are investigated in detail in order to obtain optimum PR designs. Moreover, a thorough sensitivity study of the fabrication tolerances and the operating wavelength on the performance of the PRs has also been carried out.