Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1980-03-03
1982-01-05
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
356239, 356434, G01N 2184, G01N 2188, G01N 2159
Patent
active
043091059
ABSTRACT:
Optical performance characteristics of fiber optical cable components and assemblies are tested for quality in an accurate, consistent, and stable manner by the method and apparatus of this invention. The novel apparatus enables acceptability testing of a supplier's fiber optic component/assembly by comparing its optical transmission level with the level of a similar known acceptance cable or a calibration cable, the latter two cables being incorporated in the invention apparatus. Other optical parameters can be tested by this invention to determine additional line losses, such as insertion losses, optical continuity, signal modulation, etc. Stability in the test method is assured by utilizing a variable, calibrated power source. The accurateness of the method is achieved by simultaneously coupling light from a common optical source into both the invention apparatus cables and the fiber optic cable component/assembly to be tested, which arrangement eliminates amplitude drift of the optical source and of the apparatus detector from affecting the validity of subsequent relative measurements of the optical outputs.
REFERENCES:
patent: 4090793 (1978-05-01), Lebduska
"Military Standard Fiber Optics Test Methods and Instrumentation", DOD-ST678, Nov. 30, 1977.
"Instrument for Testing Telecommunications Optical Fibres", Few, Optical Engineerng, vol. 15 #3, May--Jun. 1976, pp. 241-243.
"Measurement of Baseband Frequency Response of Multimode Fibre by Using a New Type of Mode Scrambler", Tokuda et al., Electronics Letters, Mar. 3, 1977, vol. 13, No. 5, pp. 146-147.
Johnston Ervin F.
McGraw Vincent P.
Rubens George J.
Sciascia Richard S.
The United States of America as represented by the Secretary of
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