Multi-branched optical line testing apparatus
US6028661A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 8, 1997 |
| Grant date | Feb 22, 2000 |
| Priority date | — |
| Expiry date | Dec 8, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3136
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multi-branched optical line testing apparatus can automatically detect a faulty line in multi-branched optical lines and the distance to the fault point. An optical pulse is introduced to the branch point of optical fibers and is reflected inside the respective optical fibers. The waveform of the returning response light is analyzed by an optical time-domain reflectometer (OTDR) measuring apparatus to detect a fault in the respective optical fibers and to determine the fault point. The OTDR measuring apparatus periodically converts the response light which is returned from the respective optical fibers into a digital waveform data group, calculates the attenuation ratios of the respective optical fibers by performing separation analysis of the digital waveform data group, and determines the faulty line and the position of the fault point based on the change of the attenuation ratio of the respective optical fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.