Reflectionless Tilted Grating Couplers With Improved Coupling Efficiency Based on a Silicon Overlay

Grating couplers are important photonic devices on a complementary metal-oxide-semiconductor compatible silicon-on-insulator platform to couple light between optical waveguides and free space optical components or fibers. In this letter, we report the combination of a tilted grating coupler design, which strongly suppresses the back-reflection for light… (More)