Mode spot converter based on a graded-index waveguide and a two-dimensional inverse tapered waveguide integration

Abstract

The application discloses a mode spot converter integrated based on a gradient refractive index waveguide and a two-dimensional inverted taper waveguide, which comprises a silicon substrate, a gradient refractive index waveguide, a silicon dioxide substrate, a two-dimensional inverted taper waveguide and a cladding, the silicon dioxide substrate, the two-dimensional inverted taper waveguide and the cladding are sequentially arranged on one side of the silicon dioxide substrate, and the gradient refractive index waveguide is arranged on the other side of the silicon substrate and is attached to the two-dimensional inverted taper waveguide; the opposite faces of the gradient refractive index waveguide are respectively provided with a first input port and a first output port, the long axis of the two-dimensional inverted taper waveguide is provided with a second input port and a second output port at both ends, and the first output port is attached to the second input port; incident light is incident from the first input port, is output from the first output port after being condensed by the gradient refractive index waveguide, is then incident into the two-dimensional inverted taper waveguide through the second input port for adiabatic transmission, and is finally output from the second output port and coupled with an integrated silicon waveguide.

Images