Abstract
We report an experimental study on the spectral dependence of depolarized guided acoustic-wave Brillouin scattering (GAWBS) in a silica single-mode fiber (SMF) on acoustic impedance of external materials. The GAWBS spectrum was measured when the acoustic impedance was changed from 1.51 to 2.00 kg/s·mm2. With increasing acoustic impedance, the linewidth increased; the dependence was almost linear with an acoustic impedance dependence coefficient of 0.16 MHz/kg/s·mm2. Meanwhile, with increasing acoustic impedance, the central frequency linearly decreased with an acoustic impedance dependence coefficient of -0.07 MHz/kg/s·mm2. These characteristics are potentially applicable to acoustic impedance sensing.
Highlights
Guided acoustic-wave Brillouin scattering (GAWBS), one of the nonlinear phenomena in an optical fiber, occurs by the interaction between incident light and acoustic waves propagating in the cross-sectional area of the fiber [1]
We report an experimental study on the spectral dependence of depolarized guided acoustic-wave Brillouin scattering (GAWBS) in a silica single-mode fiber (SMF) on acoustic impedance of external materials
The linewidth increased; the dependence was almost linear with an acoustic impedance dependence coefficient of 0.16 MHz/kg/s·mm2
Summary
Guided acoustic-wave Brillouin scattering (GAWBS), one of the nonlinear phenomena in an optical fiber, occurs by the interaction between incident light and acoustic waves propagating in the cross-sectional area of the fiber [1] This scattering is known to be forward scattering that accompanies multiple spectral peaks caused by acoustic resonance. The basic principle of this acoustic impedance sensing lies in the amplitude dependence of the R0,m-mode acoustic waves on the acoustic reflection between the cladding and overcladding/outside material This sensing technique suffers from a drawback that it is difficult to apply existing distributed sensing techniques [4,5,6,7,8,9,10,11,12,13,14] because of the ring-shaped configuration of the fiber under test (FUT). Distributed acoustic impedance sensing based on GAWBS will open up new applications in future, such as underground oil layer detection without employing external vibrations [15] and cancer detection in the human body exploiting the stiffness difference between normal cells and diseased cells [16,17]
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