OTDR having optically switched amplified output onto test fibre to suppress optical amplifier noise between OTDR pluses
US5343286A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1992 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Oct 14, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/319
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical test apparatus includes an optical time domain reflectometer for launching light pulses into a test fibre. An optical amplifier is provided in the light path between the optical time domain reflectometer and the test fibre or amplifying the light pulses. An optical switch is positioned in the light path between the amplifier and the test fibre for preventing light reaching the test fibre between the light pulses launched by the OTDR. Timing structure is provided for synchronising the operation of the optical switch so as to open the switch as a light pulse reaches the switch and close the switch as a light pulse leaves the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.