Optical pulse tester capable of displaying Raman or Rayleigh scattered light
US5390018A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 16, 1994 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | Mar 16, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical pulse tester capable of displaying Raman scattered light is disclosed. An optical pulse with the specified wavelength is injected into an optical fiber to be measured via a directional coupler and an optical demultiplexer/multiplexer. The demultiplexer/multiplexer demultiplexes returning light from the optical fiber into Raman scattered light different from the optical pulse in wavelength. The directional coupler divides returning light from the optical fiber into Fresnel reflection light and Rayleigh scattered light with the specified wavelength. The switcher supplies the Rayleigh scattered light to a display In the case of long distance measurement or precise loss measurement of the optical fiber. Therefore, the display displays the characteristic waveform of the optical fiber with the Rayleigh scattered light. In contrast, the switcher supplies the Raman scattered light to the display in the case of the measurement of the near-end part of the optical fiber or the connecting point between optical fibers without a dead area. Therefore, the display displays the characteristic waveform of the optical fiber with the Raman scattered light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.