Patent ID: 11886056
Assignee: CISCO TECHNOLOGY, INC.
Field: Optics (Instruments)
Classification: CPC G  Y | IPC G

Claim 9:
10. A device, comprising:
a first waveguide disposed on a substrate, the first waveguide comprising a ridge projecting in a first direction from the substrate and extending in a second direction of an optical path, wherein the first waveguide is formed from a crystalline semiconductor material;
a dielectric layer having a lower surface disposed on an upper surface of the ridge; and
a second waveguide comprising a first, planar surface disposed on an upper surface of the dielectric layer opposite the lower surface of the dielectric layer contacting the ridge, wherein a width of the first, planar surface is greater than a width of the dielectric layer and the ridge, wherein the first waveguide is doped a first conductivity type and the second waveguide is doped a second, different conductivity type, and wherein the second waveguide is formed from a polycrystalline semiconductor material; and
a silicon nitride layer disposed on at least three sides of the second waveguide.