Pump-Power-Independent Double Slope-Assisted Distributed and Fast Brillouin Fiber-Optic Sensor

Motil, Avi; Danon, Orr; Peled, Yair; Tur, Moshe

doi:10.1109/lpt.2014.2302833

Cited by 67 publications

(41 citation statements)

References 15 publications

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“…Since, consequentially, the rising and falling slopes of the Brillouin gain spectrum shape are also gain dependent, these findings might challenge the calibration of dynamic, slope-assisted sensing methods [7][8][9]. Sections 2 and 3, respectively, describe the simulation and experimental techniques used to obtain the results of Sec.…”

Section: Introductionmentioning

confidence: 99%

Gain dependence of the linewidth of Brillouin amplification in optical fibers

Motil¹,

Hadar²,

Sovran³

et al. 2014

Opt. Express

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We report a novel, pump-power dependent, linewidth broadening effect in stimulated Brillouin amplification of a continuous-wave probe by a pulsed pump. This behavior is different from the case of two interacting continuous-wave pump and probe fields, where the shape of the logarithmic Brillouin gain spectrum is independent of the pump power. Studying this effect numerically and experimentally and also analytically, we find that for a given width of the pump pulse the Brillouin linewidth grows linearly with the Brillouin logarithmic gain with a slope, which inversely depends on the pulse width. Thus, for example, in a standard single-mode fiber, a 15ns pump pulse, strong enough to generate a gain of 0.5dB, broadens the logarithmic lineshape by ~1.5MHz, while a 45ns pulse, providing the same gain, increases the linewidth by only ~0.5MHz. Since the rising and falling slopes of the shape of the Brillouin gain spectrum are also gain dependent, this effect might challenge the calibration of Brillouin distributed slope-assisted sensing techniques.

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Section: Introductionmentioning

confidence: 99%

Gain dependence of the linewidth of Brillouin amplification in optical fibers

Motil¹,

Hadar²,

Sovran³

et al. 2014

Opt. Express

Self Cite

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“…Different from the classical BOTDA that needs curve-fitting of the whole BGS to get the sensing curve, an SA-BOTDA [39,40] is implemented by selecting one of the two slopes of the BGS as the sensing curve. As shown in Figure 8, the central part of the left slope of the BGS can be simply regarded as a linear section.…”

Section: Slope-assisted Fast Botdamentioning

confidence: 99%

Recent Progress in Fast Distributed Brillouin Optical Fiber Sensing

et al. 2018

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Brillouin-based optical fiber sensing has been regarded as a good distributed measurement tool for the modern large geometrical structure and the industrial facilities because it can demodulate the distributed environment information (e.g., temperature and strain) along the sensing fiber. Brillouin optical time domain analysis (BOTDA), which is an excellent and attractive scheme, has been widely developed thanks to its high performance in a signal-to-noise ratio, a spatial resolution, and sensing distance. However, the sampling rate of the classical BOTDA is severely limited by several factors (especially the serially frequency-sweeping process) so that it cannot be suitable for the quickly distributed measurement. In this work, we summarize some promising breakthroughs about the fast BOTDA, which can be named as an optical frequency comb technique, an optical frequency-agile technique, a slope-assisted technique, and an optical chirp chain technique.

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“…On the other hand, a slopeassisted BOTDA (SA-BOTDA) for fast strain variations measurement is proposed by only single pump pulse and using a single-slope of the local Brillouin gain spectrum [35][36][37][38].The strain vibration frequency of this system is only determined by the fiber length and average number, but its maximum strain vibration range is limited to the narrow-slope of BGS (~30MHz for single-mode fiber). A double slope-assisted BOTDA is proposed to be immune to pump pulse power variations by using both side slopes of the BGS [39]. Whereas, the maximum dynamic strain ranges of these schemes are still less than 1000με [36].…”

Section: Introductionmentioning

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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Pump-Power-Independent Double Slope-Assisted Distributed and Fast Brillouin Fiber-Optic Sensor

Cited by 67 publications

References 15 publications

Gain dependence of the linewidth of Brillouin amplification in optical fibers

Gain dependence of the linewidth of Brillouin amplification in optical fibers

Recent Progress in Fast Distributed Brillouin Optical Fiber Sensing

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

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