Patent ID: 9709741
Date: 2017-07-18
CPC Classifications: G02B

Claim:
1. An apparatus comprising: a substrate; a silicon dioxide (SiO a silicon waveguide comprising a first adiabatic tapering and fully enclosed in the silicon dioxide material; and a low-index waveguide disposed on top of the substrate and adjacent to the first adiabatic tapering with respect to the substrate so that no portion of the silicon waveguide is between the low-index waveguide and the substrate, wherein the low-index waveguide comprises a second adiabatic tapering, wherein the first adiabatic tapering is adjacent to the second adiabatic tapering, wherein a first width of the first adiabatic tapering is widest at a first location along the substrate, and wherein a second width of the second adiabatic tapering is narrowest at the first location.