Waveguide coupler
US12169307B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 2022 |
| Grant date | Dec 17, 2024 |
| Priority date | — |
| Expiry date | Jun 22, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/1228
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An example device comprises: a substrate comprising a waveguide material having a waveguide refractive index (RIWG); a first layer of oxide on the substrate having an RI1 lower than the RIWG; a waveguide on the first oxide layer, the waveguide comprising the waveguide material having the RIWG; a second oxide layer on the waveguide and the first oxide layer, the second oxide layer having a second RI2 higher than the RI1 and less than the RIWG, the first oxide layer, the waveguide and the second oxide layer forming an end face for light coupling, and the waveguide extending inwards from the end face and increasing in effective RI from the end face; and an index matching material on the second oxide layer that encapsulates at least the second oxide layer and the end face, a respective RI of the index matching material being about index matched to the RI1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.