Apparatus for testing optical fiber by using detector having virtually broadened dynamic range
US5159400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1991 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Sep 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3172
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical fiber testing apparatus for testing an optical fiber as to presence and location of a fault such as breakage by inputting a pulsed coherent light beam to the optical fiber and synthesizing a return light beam reflected back from the optical fiber with a reference light beam having a frequency deviated from the pulsed light beam by a predetermined amount, wherein the synthesized waveform is detected through optical heterodyning. The electric signal obtained from the heterodyning detection is detected by an envelope detector, of which dynamic range is effectively virtually broadened by using correcting data prepared previously. The optical fiber test can be accomplished through a single measurement without involving expensiveness of hardware.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.