Dual twist single helix optical fiber grating
US8218921B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2009 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | Jan 10, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02071
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A single helix chiral fiber grating of a predetermined grating strength is provided that is operable to control light transmission in a predetermined wavelength range. The novel fiber grating comprises a first optical fiber with a first interface portion at a first end, a second interface portion at a second end, and a middle portion therebetween. The first optical fiber is configured with at least one fiber core, surrounded by a corresponding at least one cladding, with a first longitudinal section disposed within the first interface portion, a second longitudinal section disposed within the second interface portion, and also includes a longitudinal helical section, disposed therebetween within the middle portion, that comprises a longitudinal helix structure of a single predetermined handedness, having a predetermined pitch profile, and having a predetermined helix diameter profile selected and configured to produce the predetermined grating strength. The helical section of the novel fiber grating is preferably produced by placing the first optical fiber, proximal to and parallel with a second fiber (or equivalent elongated member), and longitudinally twisting them together to fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.