Polarization-independent waveguide grating coupler using an optimized polysilicon overlay
Xuetong Zhou, Gaolei Hu, Yue Qin, Hon Ki Tsang
Abstract
We propose and validate a new, to the best of our knowledge, approach to designing a polarization-independent waveguide grating coupler, using an optimized polysilicon overlay on a silicon grating structure. Simulations predicted coupling efficiencies of about -3.6 dB and -3.5 dB for TE and TM polarizations, respectively. The devices were fabricated using photolithography in a multi-project wafer fabrication service by a commercial foundry and have measured coupling losses of -3.96 dB for TE polarization and -3.93 dB for TM polarization.
Topics & Concepts
GratingMaterials scienceOpticsPolarization (electrochemistry)PhotolithographyFabricationOptoelectronicsWaveguideWaferPolarizerOverlayComputer sciencePhysicsBirefringenceMedicineProgramming languagePathologyPhysical chemistryAlternative medicineChemistryPhotonic and Optical DevicesAdvanced Fiber Optic SensorsOptical Coatings and Gratings