Patent ID: 7838866

Claim:
An optical semiconductor device, comprising: a) a coherent photonic emitter structure; b) a trench of a user definable width etched into the coherent photonic emitter structure such that the coherent photonic emitter structure is substantially L-shaped and includes a section of user-definable wider width extending from the vertex of the L-shaped semiconductor structure a user-definable length along each leg of the L-shaped semiconductor structure and having a section of user-definable wider width extending from the vertex of the L-shaped coherent photonic emitter structure a user-definable length along each leg of the L-shaped coherent photonic emitter structure; c) a sacrificial spacer layer deposited along a user-definable section of the trench; d) a waveguide fabricated on the sacrificial spacer layer by depositing a waveguide material on a user-definable portion of the sacrificial spacer layer and etching any excess waveguide material to form the waveguide; e) a mask layer deposited on the waveguide; f) a mask layer patterned on the portion of the waveguide deposited within the region associated with the coherent photonic emitter structure having a user-definable wider width as defined in step (b), wherein the mask layer defines a substantially L-shaped waveguide region having a thickness along each leg of the waveguide approximately equal to the width of the trench after deposition of the sacrificial spacer layer at a region of the trench that is not of a user-definable wider width; and g) a pattern formed in the waveguide, wherein the pattern comprises angling the vertex of the waveguide, removing the mask layer, and removing a user-definable portion of the sacrificial spacer layer.