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The sensing performance in Brillouin-based distributed fiber sensors is ultimately depends on the signal-to-noise ratio (SNR) of the received signal. In order to enhance the SNR, thus improve the sensing performance, several wavelength diversity techniques have been proposed. This paper presents the current wavelength diversity techniques employed in both Brillouin optical time-domain reflectometry...
In this paper, we have analyzed Brillouin frequency shift (BFS) in single mode silica optical fiber. The BFS is analyzed in conventional Brillouin optical time domain analysis (BOTDA) at operating wavelength of 1550 nm by a pump-probe technique. The effects of strain and temperature on BFS are fully characterized. We found that, the BFS change of 0.06 ΜΗz/μ-strain and 1.26 MHz/oC, respectively. The...
In 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...
Distributed fiber sensors offers an innovative technology for a spatially distributed measurement based on Raleigh, Brillouin and Raman scattering. By analyzing backscattered signal frequency, intensity and phase, one can realize a distributed measurement of strain, temperature and vibration over a tens of kilometers. This paper reviewed the history and current technology development of distributed...
In this paper, we propose a novel wavelength diversity technique in Brillouin optical time domain analysis (BOTDA) system to improve the Brillouin gain response and increase sensing range. This technique greatly maximizes the launching pump power, without activating the nonlinear effects that limit the conventional BOTDA sensing range. The strain and temperature effects on Brillouin frequency shift...
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