Experimental study on depolarized GAWBS spectrum for optomechanical sensing of liquids outside standard fibers

Hayashi, Naoaki; Mizuno, Yosuke; Set, Sze Yun; Yamashita, Shinji

doi:10.1364/oe.25.002239

Cited by 60 publications

(60 citation statements)

References 21 publications

(45 reference statements)

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“…Brillouin-based distributed sensing is, in general, constantly confronted with a problem of discriminative sensing of strain and temperature, and BOCDR is no exception. Combined use of some other sensing mechanisms [75][76][77][78][79][80][81][82][83][84] will be necessary. Finally, the current setup is not suitable for field tests outside the laboratory.…”

Section: Discussionmentioning

confidence: 99%

Recent Advances in Brillouin Optical Correlation-Domain Reflectometry

Mizuno

Lee

2018

Applied Sciences

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Distributed fiber-optic sensing based on Brillouin scattering has been extensively studied and many configurations have been developed so far. In this paper, we review the recent advances in Brillouin optical correlation-domain reflectometry (BOCDR), which is known as a unique technique with intrinsic single-end accessibility, high spatial resolution, and cost efficiency. We briefly discuss the advantages and disadvantages of BOCDR over other Brillouin-based distributed sensing techniques, and present the fundamental principle and properties of BOCDR with some special schemes for enhancing the performance. We also describe the recent development of a high-speed configuration of BOCDR (slope-assisted BOCDR), which offers a beyond-nominal-resolution detectability. The paper is summarized with some future prospects.

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Section: Discussionmentioning

confidence: 99%

Recent Advances in Brillouin Optical Correlation-Domain Reflectometry

Mizuno

Lee

2018

Applied Sciences

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“…Due to the interaction between the incident light and acoustic waves propagating in the cross-sectional area of the fiber, lights are scattered propagating with the pump light in the same direction, which is known to be forward-stimulated Brillouin scattering (FSBS) that accompanies multiple spectral peaks caused by acoustic resonance. Two types of acoustic modes occur in FSBS: one is the radial mode that perturbs the refractive index of the fiber cross-section, and the other is the torsional-radial mode that perturbs not only the refractive index but also the birefringence (Auld, 1973;Engan et al, 1988;Hayashi et al, 2017;Shelby et al, 1985;Thurston, 1992).…”

Section: Forward Brillouin Scatteringmentioning

confidence: 99%

Chalcogenide Taper and Its Nonlinear Effects and Sensing Applications

Gao

Bao

2020

iScience

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The nonlinear coefficient of chalcogenide glass is 200-1000 times larger than that of silica glass, and it is transparent in the 1-15 mm wavelength windows, which makes the nonlinear effects happen at much low power with a short length in near-and mid-infrared wavelength window. With tapered chalcogenide fibers, the power density in the core and the waveguide nonlinearity can be enhanced to make nonlinear signal processing unit at a compact size. The threshold of Raman scattering and supercontinuum generation is reduced due to the enhanced Kerr effect and enhanced optical power intensity. Phase-matching condition required in four-wave mixing (FWM) can be realized by tailoring fiber structures to engineer the chromatic dispersion, which enables new wavelengths creation over a large range at mW power and sub-meter length. The guided acoustic waves and longitudinal acoustic waves can be generated and detected in mW power with chalcogenide tapers. The high power density in the microwires and the high photosensitivity of chalcogenide glass in the 1550 nm band enable the inscription of FBGs in the fiber directly. The chalcogenide microwires are fragile and the core diameter cannot be tapered down to sub-microns, which can be mitigated by polymer coating that can provide mechanical strength. Polymers not only provide high mechanical strength as the coating and cladding materials but also bring over 10 times larger thermal expansion than chalcogenide cores, which enhances the sensor prospect of the chalcogenide fibers for temperature, strain, and acoustic sensing. This work reviews the present and emerging trends in investigation of chalcogenide tapers, mainly focusing on the fabrication procedure of chalcogenide microwires, the nonlinear effects, and sensing applications.

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“…(4), m  denotes the linewidth of F-SBS. This parameter is of particular significance, since it varies with the mechanical impedance of surrounding media [16][17][18][19].…”

Section: Analysis Of Forward Stimulated Brillouin Scattering In Coatementioning

confidence: 99%

“…Over the last two years, this attribute of guided acoustic waves has been used in a new class of fiber sensors, which are based on F-SBS [16][17][18][19]. The mechanical impedances of water and ethanol outside the cladding of unmodified, standard fiber were measured with 1% accuracy, based on the linewidths of guided acoustic modes that were driven through F-SBS [16].…”

Section: Introductionmentioning

confidence: 99%