Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1995-05-02
1997-04-15
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2188
Patent
active
056215177
ABSTRACT:
An optical fiber test unit and a method of operating it. The test unit has a laser with a computer controlled excitation current input. To take a measurement, the laser is turned on for a period of time which is approximately equal to twice the propagation time through the fiber. The laser is then turned off and the reflected signal is recorded. This signal is displayed and contains discontinuities which indicate discontinuities in the fiber. The unit provides good dynamic range, but is able to make measurements more rapidly than a conventional OTDR. It is therefore well suited for scan testing of fiber optic cable bundles.
REFERENCES:
patent: 5221839 (1993-06-01), Braun
patent: 5251001 (1993-10-01), Dave et al.
BellCore, TA-NWT-000196 Generic Requirements for Optical Time Domain Reflectometers (OTDRs).
BellCore, TA-TSY-001028 Generic Criteria for Optical Continuous Wave Reflectometers.
Hewlett-Packard Journal, "A Modular All-Haul Optical Time-Domain Reflectometer for Characterizing Fiber Links," Feb. 1993.
Hewlett-Packard Journal, "A High-Speed Optical Time-Domain Reflectometer with Improved Dynamic Range," Dec. 1988.
Jezwinski Scott D.
Jones Douglas L.
McGraw Vincent P.
Teradyne, Inc.
Walsh Edmund J.
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