Abstract
A distributed fiber sensor was fabricated by splicing two single-mode fibers (SMFs) using the few-mode fiber (FMF) technique. A Brillouin optical time domain analysis (BOTDA) system was developed to measure the sensor’s temperature and bending performance. Two-mode and four-mode step FMFs were combined to splice the few-mode segment. The results indicate that the temperature response coefficients of the few-mode segment are only slightly higher than those of the connected single-mode segment, measuring at 1.13 MHz/°C and 1.12 MHz/°C, respectively. The minimum bending radius for the sensor is 0.9 cm, and the four-mode bending response curve is superior to that of the two-mode one, proving that 4-SI-FMF offers better bending sensitivity.
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This work has been supported by the National Science Foundation for Distinguished Young Scholars (No.62205105), and the National Natural Science Foundation of China (Nos.61775057, 52177141 and 62171185).
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Li, Y., Liu, Z., Zhang, L. et al. Research and analysis of Brillouin distributed sensing system based on quasi-single-mode few-mode fiber. Optoelectron. Lett. 20, 7–11 (2024). https://doi.org/10.1007/s11801-024-3084-7
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DOI: https://doi.org/10.1007/s11801-024-3084-7