METHOD OF POLARISATION COMPENSATION IN GRATING-AND PHASAR-BASED DEVICES BY USING OVERLAYER DEPOSITED ON THE COMPENSATING REGION TO MODIFY LOCAL SLAB WAVEGUIDE BIREFRINGENCE

摘要

The method consists of creating a compensating region within the slabwaveguide region, with effective TE and TM mode refractive indices of thecompensating region higher than those of the original slab waveguide. Suchchange in refractive indices is achieved by deposition of a prism-shaped over-layer on the compensating region