Optical time domain reflectometer employing synchronizing signals to synchronize the sampling and manipulation of data representing fibers optic characteristics
US5453826A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1993 |
| Grant date | Sep 26, 1995 |
| Priority date | — |
| Expiry date | Sep 27, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an optical time domain reflectometer, an optical pulse output unit supplies optical pulses intermittently to an optical fiber to be measured in accordance with the input timing of a cyclic signal. In response to the intermittent supply of the optical pulses, a reflected light data sampling unit samples the signal obtained from the optical fiber while the optical pulses are being supplied, while a noise data sampling unit samples the signal obtained from the optical fiber when the optical pulses are not supplied. Each of two or more groups of reflected light data and noise data obtained by the above sampling operations is averaged. After the averaging operations, an waveform data operating unit subtracts the noise data from the reflected light data in the common mode components corresponding to each other in terms of time, and then transforms the resultant data logarithmically to thereby operate the waveform data thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.