Hybrid Raman and Brillouin scattering in few-mode fibers
US9599460B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2015 |
| Grant date | Mar 21, 2017 |
| Priority date | — |
| Expiry date | Sep 1, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and systems of sensing conditions in a fiber includes launching a light beam into a fiber. A first branch of scattered light is set to a mode other than a fundamental mode. A second branch of scattered light is optically filtered to remove unscattered input light. Brillouin scattered light is coherently detected on the first branch to produce a combined temperature/strain profile of the fiber. Raman scattered light on the second branch is directly detected to produce a temperature profile of the fiber. A strain profile of the fiber is determined, using a processor, based on the combined temperature/strain profile and the temperature profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.