Method for measuring distance between reflection points along li

Details Method for measuring distance between reflection points along li Method for measuring distance between reflection points along li

1995-11-14

1997-07-01

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188

Patent

active

056443897

ABSTRACT:
A signal for which the amplitude of envelope becomes substantially 0 only for a certain period of time within the time of a period T, and a measured signal having a certain amplitude are synthesized, and the synthesized signal is optically transmitted. When a plurality of reflection points are present on a light transmission line, there is an increase in harmonic distortion or intermodulation distortion as well as in cross modulation distortion after receiving. This increase in cross modulation distortion causes an increase in variation of amplitude of the measured signal. In such a case, it is possible to calculate the distance between, and/or reflectance of, reflection points present on end faces of optical elements and/or connecting points of optical fibers on the light transmission line by investigating first periodical characteristics of variation of the transmitted measured signal during transmission relative to the change in central light frequency of the signal light, or investigating second periodical characteristics of variation of the transmitted measured signal during transmission corresponding to the change in the frequency of the measured signal.

REFERENCES:
patent: 5062703 (1991-11-01), Wong et al.
MacDonald "Frequency Domain optical Reflectometer" Applied Optics, vol. 20, No. 10, 15 May 1981, pp. 1840-1844.

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