Polarization-OTDR for measuring characteristics of optical fibers
US6724469B2 · kind B2 · utility
35Cited by
6References
18Claims
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Key dates
| Filing date | Mar 14, 2003 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Mar 14, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3181
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method of polarization optical time-domain reflectometer (P-OTDR) for measuring a parameter of an optical transmission path, for example an optical fiber, by transmitting pulses of light into the path and measuring the state of polarization of backscattered light against distance, statistical analysis of the degree of polarization (DOP) of the backscattered signal is used to detect sections of an optical transmission path for which mode-coupling behaviour (long h) leads to high PMD. Preferably, successive DOP measurement are taken with different state of polarization, SOP, for the P-OTDR light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.