Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1993-05-06
1995-09-12
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2188
Patent
active
054501911
ABSTRACT:
A method for detecting reflection-type discontinuities in an optical waveguide fiber, such as those produced by a fiber break, a contaminant in the glass making up the fiber, a microbend, or a mechanical splice or connector, is provided. The method employs an optical time domain reflectometer (OTDR) and involves cross-correlating an OTDR trace or a modified OTDR trace, e.g., one from which fiber attenuation has been subtracted, with a predetermined waveform which is characteristic of a reflection-type discontinuity. The predetermined waveform can compensate for differences between the noise spectrum of the OTDR trace and white noise. In particular, a predetermined waveform obtained by backward differencing and then forwarding differencing an average of waveforms known to correspond to reflection-type discontinuities is able to provide such white noise compensation.
REFERENCES:
patent: 4963020 (1990-10-01), Luthra et al.
patent: 5066118 (1991-11-01), Buerli
John Karl, An Introduction to Digital Signal Processing, Academic Press, 1989, pp. 217-225.
Harry L. Van Trees, Detection, Estimation, and Modulation Theory, Part I, John Wiley & Sons, 1968, pp. 246-253.
Parks Thomas W.
Vandervort Annette L.
Brown Jay M.
Corning Incorporated
Klee Maurice M.
McGraw Vincent P.
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