Fiber Bragg grating and fabrication method
US7574075B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 2009 |
| Grant date | Aug 11, 2009 |
| Priority date | — |
| Expiry date | Mar 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02204
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of fabrication of a thermally stabilized Type I fiber Bragg grating-based temperature sensing device includes doping a fiber core material with germanium or germanium oxide for enhancing photosensitivity, co-doping the fiber core material with fluorine or chorine or for increasing a mean coordination number; and ultraviolet laser inscribing a periodic or quasiperiodic modulated refractive index structure in the fiber core using a laser energy operating at less than 1000 milliJoules per square centimeter per pulse. The resulting sensor is operable for more than 1000 hours at temperatures up to at least 550 degrees Celsius.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.