Trench-assisted multimode fiber used in Brillouin optical time domain sensors

Zhang, Zelin; Lu, Yuangang; Pan, Yuhang; Bao, Xiaoyi; Chen, Liang

doi:10.1364/oe.27.011396

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…When the 10 turns are introduced with the bend radius of 5 mm, the measured B L value is less than 0.006 dB at 1550 nm. Furthermore, the effective areas of LP 01 and LP 11 are both above 130 μm 2 in Table 1 , which make the fiber suitable for increasing the nonlinear thresholds for long-haul transmission [ 9 ].…”

Section: Low-loss Msi 2-lp-mode Fibermentioning

confidence: 99%

“…The BBS in optical fibers is a nonlinear process where a propagating optical wave can interact with longitude acoustic waves to produce backscattered waves [ 10 ]. The BBS process can be described using the following 2D scalar equation group [ 9 ]

where E ( x , y ) and u ( x , y ) are the electric field of optical mode and the displacement field of acoustic modes, respectively. The parameter λ is the wavelength of the optical mode in a vacuum.…”

Section: Bbs and Fbs Effects In Msi 2-lp-mode Fibermentioning

confidence: 99%

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Fabrication and Characterization of an Optimized Low-Loss Two-Mode Fiber for Optoacoustic Sensing

Zhang

You

et al. 2022

Micromachines

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An optimized multi-step index (MSI) 2-LP-mode fiber is proposed and fabricated with low propagation loss of 0.179 dB/km, low intermodal crosstalk and excellent bend resistance. We experimentally clarified the characteristics of backward Brillouin scattering (BBS) and forward Brillouin scattering (FBS) induced by radial acoustic modes (R0,m) in the fabricated MSI 2-LP-mode fiber, respectively. Via the use of this two-mode fiber, we demonstrated a novel discriminative measurement method of temperature and acoustic impedance based on BBS and FBS, achieving improved experimental measurement uncertainties of 0.2 °C and 0.019 kg/(s·mm2) for optoacoustic chemical sensing. The low propagation loss of the sensing fiber and the new measurement method based on both BBS and FBS may pave the way for long-distance and high spatial resolution distributed fiber sensors.

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Section: Low-loss Msi 2-lp-mode Fibermentioning

confidence: 99%

Section: Bbs and Fbs Effects In Msi 2-lp-mode Fibermentioning

confidence: 99%

Fabrication and Characterization of an Optimized Low-Loss Two-Mode Fiber for Optoacoustic Sensing

Zhang

You

et al. 2022

Micromachines

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“…With this device, broad-bandwidth ultrasound generation is achieved through the photoacoustic excitation of a special composite coating on the distal end of the multimode optical fiber by a pulsed laser [ 15 ]. Although most commercial sensing systems rely on measurements of the transmitted or reflected fundamental mode of single-mode optical fibers, more recent developments have focused on multimodal architectures that considerably widen the sensing modalities, especially in the chemical and biological fields [ 16 , 17 , 18 , 19 , 20 ]. Mode–division multiplexing is mooted to address the possibility of multiparameter sensing with a single device, the reduction of cross-sensitivities, and the improved accuracy of a single measured parameter by combining the responses of many fiber modes to its evolution.…”

Section: Introductionmentioning

confidence: 99%

Brillouin Interaction between Two Optical Modes Selectively Excited in Weakly Guiding Multimode Optical Fibers

Fotiadi

Rafailov

Коробко

et al. 2023

Sensors

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A multimode optical fiber supports excitation and propagation of a pure single optical mode, i.e., the field pattern that satisfies the boundary conditions and does not change along the fiber. When two counterpropagating pure optical modes are excited, they could interact through the stimulated Brillouin scattering (SBS) process. Here, we present a simple theoretical formalism describing SBS interaction between two individual optical modes selectively excited in an acoustically isotropic multimode optical fiber. Employing a weakly guiding step-index fiber approach, we have built an analytical expression for the spatial distribution of the sound field amplitude in the fiber core and explored the features of SBS gain spectra, describing the interaction between modes of different orders. In this way, we give a clear insight into the sound propagation effects accompanying SBS in multimode optical fibers, and demonstrate their specific contributions to the SBS gain spectrum.

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“…With this device, broad-bandwidth ultrasound generation is achieved through the photoacoustic excitation of a special composite coating on the distal end of the multimode optical fiber by a pulsed laser 18 . Although most commercial sensing systems rely on measurements of the transmitted or reflected fundamental mode of single-mode optical fibers [19][20][21][22][23] , more recent developments have focused on multimodal architectures that considerably widen the sensing modalities, especially in the chemical and biological fields [24][25][26][27][28] . Mode-division multiplexing is mooted to address the possibility of multiparameter sensing with a single device, the reduction of cross-sensitivities, and the improved accuracy of a single measured parameter by combining the responses of many fiber modes to its evolution.…”

Section: Introductionmentioning

confidence: 99%