Dual-wavelength low-power built-in-test for a laser-initiated or

Details Dual-wavelength low-power built-in-test for a laser-initiated or Dual-wavelength low-power built-in-test for a laser-initiated or

1992-06-10

1994-10-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250226, 356 731, G02B 514

Patent

active

053591925

ABSTRACT:
The optical continuity of a fiber optic conduit is tested by terminating the fiber optic conduit with an element having a wavelength-dependent coefficient of reflectivity, coupling to the fiber optic conduit light of a first wavelength band, detecting light in the first wavelength band reflected back through the fiber optic conduit, coupling to the fiber optic conduit light of a second wavelength band, and detecting light in the second wavelength band reflected back through the fiber optic conduit. A relative comparison is formed of light in the first wavelength band reflected back through the fiber optic conduit and light in the second wavelength band reflected back through the fiber optic conduit. Reliable continuity testing of a fiber optic conduit including multiple in-line connectors is thereby made possible.

REFERENCES:
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Booster, et al., "High Resolution for Backscatter Measurements", Lasers & Optronics. no date.
Masi, C. G. (Editor), "Fiber-Optics Test Sets", Test & Measurement World, pp. 77-78, Feb. 1991.
Nerschook, et al., "Wavelength selection for optical testing", Test & Measurement Lightwave, pp. 18-22, Oct. 1991.
Pearson, Eric, "Testing Fiber Optic Connections", Connection Technology, pp. 18-22, Sep. 1991.
Schneider, et al., "Testing requirements for fiber in the loop", Test & Measurement--Lightwave, pp. 18-21, Oct. 1991.

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