Determining the change of Brillouin frequency shift by using the similarity matching method

Feng Wang, Weiwei Zhan, Yuangang Lu, Zhijun Yan, Xuping Zhang

Research output: Contribution to journalArticlepeer-review


We have proposed a similarity matching method (SMM) to obtain the change of Brillouin frequency shift (BFS), in which the change of BFS can be determined from the frequency difference between detecting spectrum and selected reference spectrum by comparing their similarity. We have also compared three similarity measures in the simulation, which has shown that the correlation coefficient is more accurate to determine the change of BFS. Compared with the other methods of determining the change of BFS, the SMM is more suitable for complex Brillouin spectrum profiles. More precise result and much faster processing speed have been verified in our simulation and experiments. The experimental results have shown that the measurement uncertainty of the BFS has been improved to 0.72 MHz by using the SMM, which is almost one-third of that by using the curve fitting method, and the speed of deriving the BFS change by the SMM is 120 times faster than that by the curve fitting method.

Original languageEnglish
Pages (from-to)4101-4108
Number of pages8
JournalJournal of Lightwave Technology
Issue number19
Early online date20 Aug 2015
Publication statusPublished - 1 Oct 2015

Bibliographical note



  • Brillouin frequency shift
  • Brillouin optical time-domain reflectometry
  • Brillouin spectrum
  • optical fiber sensor
  • similarity matching


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