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Double peak-induced distance error in short-time-Fourier-transform-Brillouin optical time domain reflectometers event detection and the recovery method.



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Yu, Yifei 
Luo, Linqing 
Li, Bo 
Guo, Linfeng 
Yan, Jize 


The measured distance error caused by double peaks in the BOTDRs (Brillouin optical time domain reflectometers) system is a kind of Brillouin scattering spectrum (BSS) deformation, discussed and simulated for the first time in the paper, to the best of the authors' knowledge. Double peak, as a kind of Brillouin spectrum deformation, is important in the enhancement of spatial resolution, measurement accuracy, and crack detection. Due to the variances of the peak powers of the BSS along the fiber, the measured starting point of a step-shape frequency transition region is shifted and results in distance errors. Zero-padded short-time-Fourier-transform (STFT) can restore the transition-induced double peaks in the asymmetric and deformed BSS, thus offering more accurate and quicker measurements than the conventional Lorentz-fitting method. The recovering method based on the double-peak detection and corresponding BSS deformation can be applied to calculate the real starting point, which can improve the distance accuracy of the STFT-based BOTDR system.



spectrum analysis, densitometers, reflectometers, backscattering, optical sensing and sensors, scattering, Brillouin

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Appl Opt

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The Optical Society
Engineering and Physical Sciences Research Council (EP/K000314/1)
Engineering and Physical Sciences Research Council (EP/I019308/1)
Engineering and Physical Sciences Research Council (EP/L010917/1)
Cambridge Commonwealth, European and International Trust; China Scholarship Council; Engineering and Physical Sciences Research Council (EPSRC) (EP/ K000314/1); Schlumberger Foundation (Faculty for the Future).