An ultra-wideband polarization rotator based on SOI by using mode converters and a phase shifter

We propose a scheme to realize polarization rotation (PR) based on SOI by using two mode converters and a phase shifter. Simulation results from 3D-FDTD show that the PR has extinction ratio (ER) larger than 20 dB and insertion loss less than 0.4 dB in an ultra-wide range from 1450 nm to 1650 nm for both TM₀ and TE₀. Moreover, the total length of the device is 33μm with a height of 220 nm.