Bandwidth-reduced Brillouin optical time-domain analysis based on a quarter of the frequency of modulation |
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| Authors: | ZHANG Xiangfei WEI Zhengjun ZHENG Yingfang an WANG Jindong |
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| Affiliation: | Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China;Guangdong Provincial Key Laboratory of Nanophotonic Functional and Devices, South China Normal University, Guangzhou 510006, China,Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China;Guangdong Provincial Key Laboratory of Nanophotonic Functional and Devices, South China Normal University, Guangzhou 510006, China,Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China;Guangdong Provincial Key Laboratory of Nanophotonic Functional and Devices, South China Normal University, Guangzhou 510006, China and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China |
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| 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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