Optical fiber characteristic measuring device
US5686986A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 25, 1996 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Sep 25, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/33
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Coherent light emitted from a coherent light source 1 is sent as a probe beam through a connector 31 into an optical fiber being measured. A portion of this beam is sent to an optical frequency converter 100 to form an optical pulse train having a frequency which is frequency-swept in steps of a designated frequency at a designated periodicity, and an optical pulse having a designated frequency is extracted from the optical pulse train by an electro-optic switch 18 and sent to the optical fiber being measured. Then, a signal beam exiting the optical fiber being measured is heterodyne-received by means of a local beam passing through either a connecting optical fiber 6 side or a frequency shifter 7 side according to the selection of optical switches 4 and 5. Consequently, it is possible to measure the characteristics of the optical fiber by means of a BOTDR, BOTDA or a COTDR.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.