High-Order Polynomial Fitting Assistance for Fast Double-Peak Finding in Brillouin-Distributed Sensing

A high-order polynomial fitting method is proposed to accelerate the computation of double-Gaussian fitting in the retrieval of the Brillouin frequency shifts (BFS) in optical fibers showing two local Brillouin peaks. The method is experimentally validated in a distributed Brillouin sensor under dif...

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Published inSensors (Basel, Switzerland) Vol. 21; no. 1; p. 187
Main Authors Soto, Marcelo A, Jderu, Alin, Dorobantu, Dorel, Enachescu, Marius, Ziegler, Dominik
Format Journal Article
LanguageEnglish
Published Switzerland MDPI 30.12.2020
MDPI AG
Subjects
distributed Brillouin sensors
fiber optics sensors
Letter
stimulated Brillouin scattering
stimulated Brillouin scattering
fiber optics sensors
distributed Brillouin sensors
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Summary:A high-order polynomial fitting method is proposed to accelerate the computation of double-Gaussian fitting in the retrieval of the Brillouin frequency shifts (BFS) in optical fibers showing two local Brillouin peaks. The method is experimentally validated in a distributed Brillouin sensor under different signal-to noise ratios and realistic spectral scenarios. Results verify that a sixth-order polynomial fitting can provide a reliable initial estimation of the dual local BFS values, which can be subsequently used as initial parameters of a nonlinear double-Gaussian fitting. The method demonstrates a 4.9-fold reduction in the number of iterations required by double-Gaussian fitting and a 3.4-fold improvement in processing time.
Bibliography:SourceType-Other Sources-1
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ObjectType-Correspondence-1
ISSN:1424-8220
1424-8220
DOI:10.3390/s21010187