Method for characterizing an optical fiber link
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United States of America Patent
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May 13, 2008
Grant Date -
Aug 30, 2007
app pub date -
Oct 27, 2004
filing date -
Oct 27, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for characterizing an optical link by its beat length, coupling length and polarization mode dispersion is disclosed. A pulsed signal is sent along said optical fiber link and the backscattered signal (being a POTDR signal) is measured after passing through a polarizer. The length of said optical fiber, the average power difference between two successive minima of said backscattered signal and the number of maxima per unit length are derived. In an iterative way a beat length interval and an interval for the polarization mode coupling parameter are determined until the length of said intervals is below a predetermined value, yielding a value for the beat length and the coupling length, and the polarization mode dispersion is calculated.
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