Patent ID: 11947168
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. A method of forming a stacked edge coupler, comprising:
forming a first assisting waveguide on an insulator layer, the first assisting waveguide comprises an end surface;
forming a waveguide core over the first assisting waveguide, the waveguide core comprises a tapered section having an end surface, and the end surface of the tapered section of the waveguide core is substantially coplanar with the end surface of the first assisting waveguide; and
forming a back-end-of-line stack over the waveguide core, the back-end-of-line stack comprises:
a side edge;
a dielectric layer; and
a second assisting waveguide formed on the dielectric layer adjacent to the side edge, and the second assisting waveguide has an overlapping arrangement with the tapered section of the waveguide core.