Method of measuring optical fiber link chromatic dispersion by fractional Fourier transformation (FRFT)
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United States of America Patent
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Mar 21, 2017
Grant Date -
Jul 21, 2016
app pub date -
Nov 30, 2015
filing date -
Dec 10, 2014
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Abstract
The present invention relates to a method of measuring optical fiber link chromatic dispersion by fractional Fourier transformation (FRFT), belonging to the technical field of optical communication. The method of the present invention performs coherent demodulation for an optical pulse signal output from the optical fiber link to obtain a complex field of the optical pulse signal, then performs FRFT on the complex field; according to the energy focusing effect of the chirp signal in the fractional spectrum, calculates an optimal fractional order of the FRFT, and then calculates chromatic dispersion of the optical fiber link according to the optimal fractional order. The method can be applied to an optical fiber communication system consisting of different types of optical fibers, to perform monitoring of optical fiber link chromatic dispersion.
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