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5 November 2020 An optimization and stabilization algorithm of Brillouin shifted sidebands in BOTDA sensors
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Proceedings Volume 11569, AOPC 2020: Optical Information and Network; 1156902 (2020) https://doi.org/10.1117/12.2573119
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China
Abstract
In this paper, we introduce an optimal bias voltage searching strategy and maintaining method in BOTDA system based on dual sideband modulation. The system utilizes both up shifted and down shifted continuous wave light to generate Brillouin scattering light, while using the amplified pulsed light to boost the signal by stimulated Brillouin scatting effect. In order to obtain a clean Brillouin shifted curve along the fiber under test, the probe light must be in good signal to noise ratio. In addition, the intensity of shifted light should be stable as well. Therefore, we propose a novel control method of frequency shift in sideband modulation of a BOTDA system, which keeps the first order frequency-shifted light at its maximum signal to noise ratio and minimum light intensity fluctuation. We also implement static experiments to verify our proposed scheme. Strain/temperature tests were taken out to evaluate the performance of the BOTDA. Results showed that the resolution of BOTDA system could reach 13με/0.65°C at 50 km fiber cable with spatial resolution of 0.5m.
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Liang Pan, Xiaojun Yang, Ying Mei, Shengli Ma, Yong Yang, and Lingbing Kong "An optimization and stabilization algorithm of Brillouin shifted sidebands in BOTDA sensors", Proc. SPIE 11569, AOPC 2020: Optical Information and Network, 1156902 (5 November 2020); https://doi.org/10.1117/12.2573119
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