Optical mode transformer, in particular for coupling an optical fiber and a high-index contrast waveguide
US8320721B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2008 |
| Grant date | Nov 27, 2012 |
| Priority date | — |
| Expiry date | Sep 13, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/1228
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical mode transformer comprises a first waveguide including a first core, a first cladding and an end facet configured to be coupled to an optical fiber. The transformer further includes a second waveguide comprising a second core, a second cladding and an end directly coupled to an end of the first waveguide. A third waveguide comprises a third core and a third cladding, and is arranged with respect to the second waveguide so as to realize an evanescent optical coupling with the second waveguide. The third core includes a tapered region wherein evanescent coupling takes place, and wherein a refractive index contrast of the first waveguide is less than a refractive index contrast of the second waveguide, the refractive index contrast of the second waveguide is less than a refractive index contrast of the third waveguide, and the refractive index contrast of the third waveguide is not less than 18%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.