Distributed optical fibre sensors based on spontaneous Brillouin scattering employing multimode Fabry-Pérot lasers

Soto, Marcelo A.; Bolognini, G.; Pasquale, F. Di

doi:10.1049/el.2009.2381

Cited by 7 publications

(12 citation statements)

References 3 publications

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“…It is important to mention that there have been some prior works using multi-tone signals to interrogate distributed Brillouin sensors [15][16][17][18][19]: for instance, the schemes described in [15,16] use a multi-wavelength optical pump to improve the performance of Brillouin optical time-domain reflectometers (BOTDR), while the method proposed in [17,18] makes use of multiple tones in a BOTDA system to eliminate the need for pump-probe frequency scanning and to make fast dynamic measurements possible. Although there are some similarities with the mentioned prior works [17][18][19], the implementation and objectives of the method proposed in this paper are significantly different.…”

Section: Proposed Methods Based On a Multi-frequency Pump-probe Brillomentioning

confidence: 99%

“…This way, a strong sensing response can be obtained, providing a significant SNR enhancement with respect to a standard BOTDA scheme. Furthermore, the technique proposed in this paper is fully compatible with a simple direct detection, avoiding sophisticated coherent detection schemes, as needed in [15][16][17][18][19]; thus, requiring minimum changes to the conventional BOTDA scheme since the frequency scan, acquisition procedure and data processing remain unmodified.…”

Section: Proposed Methods Based On a Multi-frequency Pump-probe Brillomentioning

confidence: 99%

“…Δf > 2ν B (ν B ≈10-11 GHz in standard single-mode fibers). The main drawback of this configuration is the broad total spectral coverage in presence of a large number N of well separated frequency components: in this case the measured Brillouin gain spectrum is broadened [15,16,23] as a result of the pump wavelength dependence of the Brillouin frequency, while the system also becomes much more susceptible to effects of chromatic dispersion. Dispersion actually imposes the most restrictive limitation to the number of tones in this case, so that the detrimental effect of gain broadening [2,23] can be generally neglected.…”

Section: Pump (Limited By Mi) Probe (Limited By Sbs) Gainmentioning

confidence: 99%

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Time and frequency pump-probe multiplexing to enhance the signal response of Brillouin optical time-domain analyzers

Soto¹,

Ricchiuti²,

Zhang³

et al. 2014

Opt. Express

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Abstract:A technique to enhance the response and performance of Brillouin distributed fiber sensors is proposed and experimentally validated. The method consists in creating a multi-frequency pump pulse interacting with a matching multi-frequency continuous-wave probe. To avoid nonlinear cross-interaction between spectral lines, the method requires that the distinct pump pulse components and temporal traces reaching the photodetector are subject to wavelength-selective delaying. This way the total pump and probe powers launched into the fiber can be incrementally boosted beyond the thresholds imposed by nonlinear effects. As a consequence of the multiplied pump-probe Brillouin interactions occurring along the fiber, the sensor response can be enhanced in exact proportion to the number of spectral components. The method is experimentally validated in a 50 km-long distributed optical fiber sensor augmented to 3 pump-probe spectral pairs, demonstrating a signal-to-noise ratio enhancement of 4.8 dB.

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Section: Proposed Methods Based On a Multi-frequency Pump-probe Brillomentioning

confidence: 99%

Section: Proposed Methods Based On a Multi-frequency Pump-probe Brillomentioning

confidence: 99%

Section: Pump (Limited By Mi) Probe (Limited By Sbs) Gainmentioning

confidence: 99%

See 1 more Smart Citation

Time and frequency pump-probe multiplexing to enhance the signal response of Brillouin optical time-domain analyzers

Soto¹,

Ricchiuti²,

Zhang³

et al. 2014

Opt. Express

View full text Add to dashboard Cite

show abstract

“…In the conventional BOTDR, the SNR can be improved by increasing the input pump power and local oscillator reference signal power. However, the local oscillator signal power is strong enough, thus the SNR is no longer dependant on the reference signal power [3]. On the other hand, the launching pump power in the BOTDR system is limited by the non-negligible nonlinearities in the sensing fibre, typically called SBS [4].…”

Section: Introductionmentioning

confidence: 99%

“…The multiple wavelength pumps significantly increase the total launched pump power into the sensing fibre beyond the nonlinear threshold level without activating any nonlinear effects. Since, the nonlinear threshold power limit is based on the peak power per wavelength [3]. In order to evaluate the performance of the proposed system, the temperature effects have been measured and compared with those from the conventional BOTDR.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of BOTDR system using wavelength diversity technique

Lalam

Dai

et al. 2017

SPIE Proceedings

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) Performance improvement of BOTDR system using wavelength diversity technique ABSTRACTIn this paper, a novel technique was proposed to improve the sensing performance by employing wavelength diversity in Brillouin optical time domain reflectometry (BOTDR). This technique enables to maximize the launch pump power to achieve a higher measurement accuracy, without activating the nonlinear effects, which limit the conventional BOTDR performance. Experimentally, we have demonstrated the proposed technique, that provides measurement accuracy improvement of 3.6 times at far end of the sensing fibre compared to the conventional BOTDR system.

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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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Distributed optical fibre sensors based on spontaneous Brillouin scattering employing multimode Fabry-Pérot lasers

Cited by 7 publications

References 3 publications

Time and frequency pump-probe multiplexing to enhance the signal response of Brillouin optical time-domain analyzers

Time and frequency pump-probe multiplexing to enhance the signal response of Brillouin optical time-domain analyzers

Performance improvement of BOTDR system using wavelength diversity technique

Probe pulse design in Brillouin optical time‐domain reflectometry

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