Patent ID: 10317584

Abstract:
A grating coupler and a preparation method thereof are provided. The grating coupler includes a substrate layer, a lower confining layer, a waveguide core layer, and an upper confining layer that are sequentially arranged. The waveguide core layer includes a submicron waveguide, a first tapered waveguide, and a waveguide array. The waveguide array includes at least two waveguide groups, the waveguide group includes at least one waveguide chain, the waveguide chain includes at least two waveguides that have different widths, and the waveguides in the waveguide chain are connected to each other. An end of the waveguide chain in the waveguide array is connected to a wide end of the first tapered waveguide, and a narrow end of the first tapered waveguide is connected to the submicron waveguide.