Detection of stress applied to an optical fiber
US5109443A · kind A · utility
19Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1989 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Nov 13, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Shocks or sudden stresses caused by attempts to tap into an optical fiber network are detected by monitoring the "speckle pattern" produced by intermodal interference at the output of a multimode fiber. The fiber is a single mode optical fiber communication link through which a monitoring beam having a wavelength at which the fiber supports multiple propagation modes is also transmitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.