Highly nonlinear optical fiber with improved SBS threshold and moderate attenuation
US9366811B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2013 |
| Grant date | Jun 14, 2016 |
| Priority date | — |
| Expiry date | Mar 4, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A highly nonlinear optical fiber having an improved stimulated Brillouin scattering threshold is provided. The fiber includes a central core region made substantially from silica doped with aluminum, a trench region surrounding the central core region, and a silica cladding surrounding the trench region. The refractive index profile of the fiber is optimized. A refractive index difference of the central core region relative to the cladding (Δn+) is less than 26×10−3, and more preferably at or near 21×10−3. A refractive index difference of the trench region relative to the cladding (Δn−) is less than −5×10−3. The trench region is preferably doped with fluorine. The aluminum doping level of the central core region is preferably less than 14 wt % Al. A fiber doped with aluminum having this refractive index profile exhibits a significantly higher figure of merit (PthγLeff) than conventional germanium-doped fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.