Patent ID: 11886020
Assignee: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 15:
16. A method comprising:
providing a wafer comprising a foundation semiconductor layer;
forming an annular waveguide in the foundation semiconductor layer, the annular waveguide comprising a waveguide base and a waveguide core narrower than the waveguide base;
forming an outer contact region in the foundation semiconductor layer, the outer contact region comprising a first-type doping and disposed annularly and at least partially surrounding an outer annular surface of the waveguide base;
forming an inner contact region in the foundation semiconductor layer, the inner contact region comprising a second-type doping and disposed annularly contacting an inner annular surface of the waveguide base; and
forming an annular detector region annularly at a distance from and covering at least a portion of a surface of the waveguide core and contacting the outer contact region, wherein the annular detection region is physically isolated from the waveguide core.