Coherent BOTDA Sensor With Single-Sideband Modulated Probe Light

Li, Zonglei; Yan, Lianshan; Shao, Liyang; Pan, Wei; Luo, Bin; Liang, Jiawei; He, Haijun

doi:10.1109/jphot.2016.2518866

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…Then, an optical coupler was used to split the output light into two branches. The lower-branch with 90% power component was modulated by a single sideband modulator (SSBM), which was driven by an 880MHz RF signal output from a microwave generator (MWG), generating the probe wave (carrier) and Ref-wave ( + 1th order sideband) [49] under the −1th order sideband suppression regime. Meanwhile, a Fabry-Pérot interferometer (FPI) was employed to monitor this process.…”

Section: Methodsmentioning

confidence: 99%

Slope-assisted BOTDA based on vector SBS and frequency-agile technique for wide-strain-range dynamic measurements

et al. 2017

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We present a slope-assisted BOTDA system based on the vector stimulated Brillouin scattering (SBS) and frequency-agile technique (FAT) for the wide-strain-range dynamic measurement. A dimensionless coefficient K defined as the ratio of Brillouin phase-shift to gain is employed to demodulate the strain of the fiber, and it is immune to the power fluctuation of pump pulse and has a linear relation of the frequency detuning for the continuous pump and Stokes waves. For a 30ns-square pump pulse, the available frequency span of the K spectrum can reach up to 200MHz, which is larger than fourfold of 48MHz-linewidth of Brillouin gain spectrum. For a single-slope assisted BOTDA, dynamic strain measurement with the maximum strain of 2467.4με and the vibration frequency components of 10.44Hz and 20.94Hz is obtained. For a multi-slope-assisted BOTDA, dynamic measurement with the strain variation up to 5372.9με and the vibration frequency components of 5.58Hz and 11.14Hz is achieved by using FAT to extend the strain range.

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Section: Methodsmentioning

confidence: 99%

Slope-assisted BOTDA based on vector SBS and frequency-agile technique for wide-strain-range dynamic measurements

et al. 2017

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“…Distributed fibre optic sensing (DFOS) system is mostly designed based on the principle of optical time domain reflectometry (OTDR), optical frequency domain reflectometry (OFDR), optical correlation domain reflectometry (OCDR), optical time domain analysis (OTDA), optical frequency domain analysis and optical correlation domain analysis techniques [1][2][3][4][5][6]. In all analysis technique-based DFOS systems, the degree of system complexity is more and also this type of systems are subjected to strong nonlinearity effects.…”

Section: Introductionmentioning

confidence: 99%

Dynamic range enhancement of OTDR using lifting wavelet transform‐modified particle swarm optimisation scheme

Tangudu

Sahu

2019

IET Optoelectronics

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“…The sensing performance, in terms of spatial resolution, sensing range, and measurand accuracy, is mainly limited by the signal-to-noise ratio (SNR) of the sensor response [2], which is restricted by fiber nonlinearities [3,4], and the non-local effects [5]. In the past few years, coherent detection has been applied to BOTDA systems for SNR enhancement, fast measurement, and as well as Brillouin phase shift detection [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Brillouin phase shift detection enables dynamic measurement [8,16], and also increases the tolerance to non-local effect [9].…”

Section: Introductionmentioning

confidence: 99%

Averaging-free vector Brillouin optical time domain analyzer assisted by reference probe lightwave

et al. 2018

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We propose and experimentally demonstrate a vector Brillouin optical time domain analyzer (BOTDA) system, which enables both distributed Brillouin gain spectrum (BGS) and Brillouin phase-shift spectrum (BPS) measurements without trace averaging. The proposed scheme generates and launches a reference light into the fiber under test (FUT), together with the Stokes probe light to indicate the phase noise and distortion in the probe. The commercial integrated coherent receiver at the detection end, using a local oscillator (LO) generated with single sideband (SSB) modulation, on the one hand, improves the signalto-noise ratio (SNR) to avoid the need of trace averaging for the signal acquisition. On the other hand, by processing and analyzing the receiver outputs at specific intermediate frequencies (IF), the amplitude and phase signals carried by the Stokes probe and the reference light can be resolved at once. In this way, both Brillouin gain and Brillouin phaseshift signals can be obtained simultaneously. By scanning the the Stokes probe light frequency and recording the Brillouin response at each scanning frequency, both distributions of Brillouin gain spectrum and phase-shift spectrum have been acquired. The configuration is approved by experiments carried out over an 18.2 km FUT with the spatial resolution of 2 m.

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Coherent BOTDA Sensor With Single-Sideband Modulated Probe Light

Cited by 12 publications

References 21 publications

Slope-assisted BOTDA based on vector SBS and frequency-agile technique for wide-strain-range dynamic measurements

Slope-assisted BOTDA based on vector SBS and frequency-agile technique for wide-strain-range dynamic measurements

Dynamic range enhancement of OTDR using lifting wavelet transform‐modified particle swarm optimisation scheme

Averaging-free vector Brillouin optical time domain analyzer assisted by reference probe lightwave

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