US Patent 10429582 Waveguide-to-waveguide couplers with multiple tapers

Waveguide-to-waveguide couplers, systems that include waveguide-to-waveguide couplers, and methods of fabricating waveguide-to-waveguide couplers. A first waveguide is coupled to a first waveguide taper, and a second waveguide is coupled to a second waveguide taper. The first waveguide and the first waveguide taper are comprised of silicon, and the second waveguide and the second waveguide taper are comprised of silicon nitride. The second waveguide and the second waveguide taper are arranged in a vertical direction over the first waveguide and the first waveguide taper.