Patent ID: 9703038
Date: 2017-07-11
CPC Classifications: G02B

Claim:
1. A facet optical coupler comprising: a silicon substrate having a first two-dimensional edge and a second two-dimensional edge opposite the first two-dimensional edge; a layer of second material disposed on the silicon substrate and having a two-dimensional edge substantially co-planar with the first two-dimensional edge of the silicon substrate; an undercut region in the silicon substrate, the undercut region being proximate to and offset from the first two-dimensional edge of the silicon substrate and being distal from the second two-dimensional edge of the silicon substrate; and a waveguide embedded within the layer of second material and having an end positioned over the undercut region such that the waveguide only partially extends across the undercut region, wherein the undercut region is closer to the first two-dimensional edge than the waveguide.