Free space fibre-to-fibre coupling using optical fibres below cut-off
US9372310B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2014 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | Jan 13, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/116
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of free space fiber-to-fiber coupling includes providing a first optical fiber and a second optical fiber spaced apart from one another by a free space distance having a pair of spaced-apart achromatic collimating lenses within the free space distance. Essentially single mode light is launched from the first fiber at a wavelength λ or a range of λs that provides at least a portion of its light at wavelength(s) below a cut-off wavelength for the first fiber. The first optical fiber and second optical fiber are both <50 m and sufficiently short to provide essentially single mode operation. The essentially single mode light after the launching propagates as free space light through said free space distance and is received by and propagates in the second optical fiber as essentially single mode light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.