Abstract
Aiming at the problem of high requirement for the signal generator in the Brillouin optical time-domain analysis (BOTDA) system, a quarter of the Brillouin frequency shift (BFS) of modulation is proposed to reduce the required bandwidth of the sensing system. A functional model for solving the intensity of each-order sideband of the output light of electro-optic modulator (EOM) is proposed and applied, so the spectrum with suppressed the carrier and the first-order sidebands while maximizing the second-order sidebands is obtained. Compared with the latest scheme, the intensity of the second-order sidebands is increased by 21.1% based on this functional model. In the experiment, the second-order upper sideband and the second-order lower sideband are used as continuous wave (CW) probe light and pump pulse light, respectively, which ultimately reduces the required bandwidth of radio frequency (RF) signal sources to a quarter of the BFS (reduced from ∼11 GHz to ∼2.75 GHz), and the frequency sweep range is also reduced to a quarter of the original.
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Zhang, X., Wei, Z., Zheng, Y. et al. Bandwidth-reduced Brillouin optical time-domain analysis based on a quarter of the frequency of modulation. Optoelectron. Lett. 18, 472–478 (2022). https://doi.org/10.1007/s11801-022-2029-2
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DOI: https://doi.org/10.1007/s11801-022-2029-2