High-efficiency grating coupler based on intermediate-refractive-index waveguide material and preparation method therefor
A grating coupler and refractive index technology, applied in the direction of optical waveguide light guide, light guide, optics, etc., can solve the problems of complex processing technology and low coupling diffraction efficiency, and achieve the effect of simple process steps, high diffraction coupling efficiency and mature technology
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[0035] Example 1
[0036] A high-efficiency grating coupler based on medium refractive index waveguide material, please refer to figure 1 , Including a substrate 1, a lower cladding layer 2, a medium refractive index material layer 3, an insulating layer 4, an amorphous silicon grating 5 and an upper cladding layer 6; wherein the structure of the grating coupler is the substrate 1 from bottom to top , Lower cladding layer 2, medium refractive index material layer 3, insulating layer 4, amorphous silicon grating 5, upper cladding layer 6. The light is transmitted in the medium refractive index material 3 in the waveguide mode. When the light is transmitted to the grating area and is diffracted by the amorphous silicon grating 5, the light wave meeting the Bragg condition is emitted at a specific angle and collected by the single-mode fiber 7. On the contrary, the light injected from the single-mode optical fiber 7 is coupled into the medium refractive index material waveguide 3 th...
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