Fiber-optic devices and sensors using fiber grating
US5444803A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1994 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Feb 15, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Fiber-optic devices and sensors are implemented using fiber gratings. The fiber-optic device includes the fiber grating, an input mode stripper and an output mode stripper placed at both ends of the fiber grating, to admit only one mode therethrough, and a polarizer. The fiber grating of this invention is used in combination with a directional coupler instead of a mode stripper and a polarizer. The fiber-optic device outputs desired wavelengths, a switching signal or an interference signal. An external perturbation, such as a strain, a temperature, light pulse, and etc. may be applied to the fiber grating in its preparation to change a characteristic of the fiber grating. These perturbations are actively used to make fiber-optic devices and sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.