Performance enhancement for long distance BOTDR sensing system based on high extinction ratio probe pulse generator

Zhang, Yixin; Xia, Lan; Wu, Xuelin; Zhang, Xuping; Wang, Guanghui

doi:10.1117/12.2071653

Cited by 2 publications

(3 citation statements)

References 10 publications

(11 reference statements)

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“…In 2014, Zhang et al reported a configuration of a high-ER probe pulse generator assisted by a synchronised optical switch. It was found that when the ER of the probe pulse was increased from 35 to 65 dB, the temperature uncertainty decreased from 5.2 to 0.8°C [52]. In 2018, Bai et al used the gain switch modulation method to increase the pulse ER to 51.26 dB, which extended the sensing distance from 10.75 to 27.5 km with a spatial resolution of 1 m. Furthermore, at the position of 9.941 km in the FUT, the rootmean-square (RMS) error of BFS decreased from 2.49 to 0.78 MHz, and the fluctuation range decreased from 7.84 to 2.76 MHz [53].…”

Section: Pulse Shape Modulationmentioning

confidence: 99%

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Probe pulse design in Brillouin optical time‐domain reflectometry

Wang

et al. 2022

IET Optoelectronics

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Brillouin optical time‐domain reflectometry (BOTDR) is a branch of distributed fibre‐optic sensors, and it can measure the strain and the temperature information, localised by the return time of the probe pulse, along the fibre based on the spontaneous Brillouin scattering process. Parameters of the BOTDR system, including the spatial resolution, the signal‐to‐noise ratio, the measurement speed, and the sensing range, have a mutually restrictive relationship. In order to improve the performance of the BOTDR system, researchers have focussed on improving the design of the probe pulse, for example, transforming the shape, the sequence, and the spectral properties of the pulse. This study summarises the recent progress in the design of detection pulses in BOTDR systems, and comprehensively demonstrates the improvement effects of various pulse modulation formats on the system performance.

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Section: Pulse Shape Modulationmentioning

confidence: 99%

“…reported a configuration of a high‐ER probe pulse generator assisted by a synchronised optical switch. It was found that when the ER of the probe pulse was increased from 35 to 65 dB, the temperature uncertainty decreased from 5.2 to 0.8° C [52]. In 2018, Bai et al.…”

Section: Single Probe Pulse Modulationmentioning

confidence: 99%

Probe pulse design in Brillouin optical time‐domain reflectometry

Wang

et al. 2022

IET Optoelectronics

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“…However, in some cases, it is necessary to use spontaneous Brillouin scattering to measure temperature and strain. So, it is significant to use HNLF rather than standard SMF in BOTDR to avoid the SBS (Zhang et al, 2014). Meanwhile, this characteristic has proved the necessity of two-step EDFA.…”

Section: Experiments Of Brillouin Scatteringmentioning

confidence: 99%

A two-parameter distributed sensing system for temperature and strain monitoring based on highly nonlinear fiber

Zhan

Shen

Sun

et al. 2019

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Purpose The purpose of this paper is to theoretically analyze and experimentally demonstrate the investigation of and present a kind of sensing system for monitoring simultaneous temperature and strain measurements based on highly nonlinear fiber (HNLF) and single mode fiber (SMF). Design/methodology/approach First, the stimulated Brillouin scattering (SBS) characteristics of the HNLF have been studied, including the Brillouin gain bandwidth, Brillouin gain center frequency and SBS threshold. Second, based on the Brillouin gain center frequency, the Brillouin frequency shift coefficients of strain and temperature in HNLF have been studied. Third, the sensing and signal interrogation scheme for simultaneous monitoring of temperature and strain with high resolution has been presented. Findings It is found that the HNLF has a wider Brillouin gain bandwidth. The SBS threshold of HNLF is 78 mW, which is much larger than 7.9 mW of SMF. Also, the Brillouin frequency shift coefficients of strain and temperature in HNLF are 0.0308 and 0.413 MHz/°C, respectively. Originality/value The larger threshold of SBS is useful to avoid SBS under certain situations that Spontaneous Brillouin Scattering is necessary and should be applied. The technique is based on the fact that the Brillouin frequency shift coefficients of strain and temperature in HNLF are different from those in SMF. Therefore, the two-parameter monitoring can be achieved by producing SBS and obtaining the back-scattering Brillouin signal light simultaneously in HNLF and SMF.

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Performance enhancement for long distance BOTDR sensing system based on high extinction ratio probe pulse generator

Cited by 2 publications

References 10 publications

Probe pulse design in Brillouin optical time‐domain reflectometry

Probe pulse design in Brillouin optical time‐domain reflectometry

A two-parameter distributed sensing system for temperature and strain monitoring based on highly nonlinear fiber

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