Patent ID: 11934008
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 15:
16. A method of forming a structure for an edge coupler, the method comprising:
forming a waveguide core over a dielectric layer, wherein the waveguide core includes a tapered section; and
forming a back-end-of-line stack over the waveguide core and the dielectric layer wherein the back-end-of-line stack includes a first interlayer dielectric layer, a second interlayer dielectric layer on the first interlayer dielectric layer, a side edge, a first feature, a second feature, a third feature laterally arranged between the first feature and the second feature, and a fourth feature, the first feature, the second feature, and the third feature are positioned on the first interlayer dielectric layer adjacent to the side edge, the fourth feature is positioned on the second interlayer dielectric layer over the third feature, the third feature terminates at a first end surface adjacent to the side edge and a second end surface opposite to the first end surface, the fourth feature terminates at a third end surface adjacent to the side edge and a fourth end surface opposite to the third end surface, the third feature overlaps with the tapered section of the waveguide core by a first distance between the first end surface and the second end surface, the fourth feature overlaps with the tapered section of the waveguide core over a second distance between the third end surface and the fourth end surface, and the second distance is less than the first distance.