Spatial resolution enhancement of DFT-BOTDR with high-order self-convolution window

He, Qian; Jiang, Heng; Wang, Zongqiang; Ye, Shubing; Shang, Xiongjun; Li, Tong; Tang, Lijun

doi:10.1016/j.yofte.2020.102188

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…A zero-padded STFT-BOTDR can restore the asymmetric and deforming Brillouin scattering spectrum [17]; however, it caused spectrum leakage and reduces accuracy. A 4th-order Hanning self-convolution window can effectively suppress spectral leakage [18], but the number of calculations required increased significantly. A hybrid optimization algorithm based on shuffled frog leaping and least-squares support vector machine can precisely fit the multipeak spectrum [19]; however, its running efficiency was low.…”

Section: Introductionmentioning

confidence: 99%

High-Precision Measurement of Brillouin Frequency Shift in Brillouin Optical Time-Domain Reflectometer Based on Half-Peak Fitting Algorithm of Power Spectrum

Dong

Shan

et al. 2023

IEEE Access

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The Brillouin optical time-domain reflectometer (BOTDR) system, which is based on the Brillouin frequency shift (BFS) of the scattering spectrum, has been widely applied to monitor the temperature and strain in many fields. The measurement accuracy of the BFS directly affects the monitoring and location of the temperature change or strain events. In this study, the characteristics of the least-squares fitting optimal solution of the Brillouin power spectrum are theoretically investigated, and a half-peak fitting algorithm is proposed to measure the BFS with high accuracy and stability. In particular, it can precisely determine the double-peak spectrum and detect the position in the transition section of a temperature change or strain event. Furthermore, it can reduce calculation complexity and enhance measurement speed by dropping most of the data. For the fiber under test (FUT) with a length of 12-km, 200 groups of time-domain data were processed using a probe pulse of width 50 ns and sampling rate 1 GHz. The half-peak fitting algorithm increased the temperature measurement accuracy by ~1 fold, with ~20% calculation of full fitting. Meanwhile, it effectively eliminated the influence of minor peak in the doublepeak spectrum, and optimized the spatial resolution of the temperature change position to 0.1-m, which is the maximum limitation by sampling rate.

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Section: Introductionmentioning

confidence: 99%

High-Precision Measurement of Brillouin Frequency Shift in Brillouin Optical Time-Domain Reflectometer Based on Half-Peak Fitting Algorithm of Power Spectrum

Dong

Shan

et al. 2023

IEEE Access

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“…Adopting appropriate pulse coding technology can increase the average power of the probe light and enhance the SR, which is a special practical method to improve the system performance [ 8 , 9 , 10 , 11 ]. The advanced data processing method can raise the SNR and SR without increasing the system cost [ 12 , 13 , 14 , 15 ]. The iterative subdivision method [ 14 ] has been used to improve the SR, where the author exploited the probe pulse with a width of 100 ns to achieve SR of 1.5 m in a 50 km BOTDR.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Performance for Raman Assisted BOTDR by Analyzing Brillouin Gain Spectrum

Huang

Sun

Jiao

et al. 2021

Sensors

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We propose a simplified partitioned Brillouin gain spectrum (BGS) analysis method to enhance the spatial resolution and measurement accuracy of a Brillouin optical time-domain reflectometer (BOTDR) assisted by a first-order Raman pump. We theoretically derive the mathematical model of the partitioned BGS and analyze the superposition process of sub-Brillouin signals within a theoretical spatial resolution range. We unified all the unknown constant parameters of the calculation process to simplify the partitioned BGS analysis method and the value of the uniform parameter is attained through the system test data and numerical analysis. Moreover, to automate data processing, the starting point of the temperature/strain change is determined by the first occurrence of the maximum Brillouin frequency shift (BFS), then the position where the partitioned BGS analysis method calculation begins is obtained. Using a 100 ns probe pulse and partitioned BGS analysis method, we obtain a spatial resolution of 0.4 m in the 78.45-km-long Raman-assisted BOTDR system, and the measurement accuracy is significantly improved. In addition, we achieve a strain accuracy of 5.6 με and a spatial resolution of 0.4 m in the 28.5-km-long BOTDR without Raman amplification.

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“…To date, a variety of methods have been implemented to acquire the information on Brillouin gain spectrum (BGS) distributions, from which the magnitude and position of strain or temperature change can be derived [1]. One of the most widely used techniques is a time-domain technique, which includes Brillouin optical time-domain analysis (BOTDA) [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and Brillouin optical time-domain reflectometry (BOTDR) [18][19][20][21][22][23][24][25]. Their performance has been dramatically enhanced, and even sub-centimeter spatial resolution and real-time operation have been achieved.…”

Section: Introductionmentioning

confidence: 99%

Recent progress in slope-assisted Brillouin optical correlation-domain reflectometry

Lee

Nakamura

Mizuno

2020

Optical Fiber Technology

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Spatial resolution enhancement of DFT-BOTDR with high-order self-convolution window

Cited by 9 publications

References 9 publications

High-Precision Measurement of Brillouin Frequency Shift in Brillouin Optical Time-Domain Reflectometer Based on Half-Peak Fitting Algorithm of Power Spectrum

High-Precision Measurement of Brillouin Frequency Shift in Brillouin Optical Time-Domain Reflectometer Based on Half-Peak Fitting Algorithm of Power Spectrum

Improvement of Performance for Raman Assisted BOTDR by Analyzing Brillouin Gain Spectrum

Recent progress in slope-assisted Brillouin optical correlation-domain reflectometry

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