Integrated polarizer based on 45° tilted gratings.

We report the first integrated implementation of a polarizer based on the use of 45 degrees tilted gratings in planar waveguides. The waveguides and gratings are fabricated by direct UV writing in a hydrogenated germanium-doped silica-on-silicon chip. We experimentally demonstrate a polarization extinction ratio per unit length of 0.25 dB mm(-1) with a modelled wavelength dependence smaller than 0.3 dB for a 20 mm device over the C band from 1530-1570 nm. We also present a novel numerical study and analytical description of the architecture that are in good agreement with each other and the experimental data. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.