Study on Polarization State Transition of Single-mode SOI Curved Optical Waveguide Using FDTD

In this paper, the coupling and conversion behaviors of all the polarization states of guided-mode in an SOI (Silicon on Insulator) curved waveguides are investigated with Optiwave FDTD simulations and experiments. Research shows, the conversion efficiency between two transverse polarizations, from Ex to Ey of SOI curved waveguide is lower than the conversion efficiency from one polarization Ex to the horizontal polarization Ez. The experimental results are agreeable with the FDTD simulations. Thereby, it is possible to realize the polarization state conversion and the TE/TM-mode transmission of the guided-mode in an SOI waveguide device in applications.