G - Physics – 01 – M
Patent
G - Physics
01
M
G01M 11/02 (2006.01) G01M 11/00 (2006.01)
Patent
CA 2121419
Abstract of the Disclosure 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.
Parks Thomas William
Vandervort Annette Louise
Corning Incorporated
Gowling Lafleur Henderson Llp
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