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

Claim 8:
9. A stacked edge coupler, comprising:
an insulator layer having a side edge;
a first assisting waveguide on the insulator layer, the first assisting waveguide comprises a tapered section having an end surface and the end surface is substantially coplanar with the side edge of the insulator layer;
a waveguide core over the first assisting waveguide, the waveguide core comprising a tapered section having a side edge and the side edge of the tapered section is over the end surface of the first assisting waveguide; and
a back-end-of-line stack over the waveguide core, the back-end-of-line stack comprises:
a side edge;
a dielectric layer;
a second assisting waveguide;
a third assisting waveguide; and
a fourth assisting waveguide arranged laterally between the second assisting waveguide and the third assisting waveguide, the second assisting waveguide, the third assisting waveguide, and the fourth assisting waveguide arranged on the dielectric layer adjacent to the side edge, and the fourth assisting waveguide having an overlapping arrangement with the tapered section of the waveguide core.