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<p>To overcome the limitations by pulse width on the event zone measurement capability, a novel temperature demodulation scheme was proposed and validated to measure sub-pulse length event zones based on the slope-assisted Brillouin frequency shift (SA-BFS). Unlike the conventional BFS-based methods, this approach leverages the BFS slope for temperature demodulation, enabling precise measurement of sub-pulse-length event zones. We developed a theoretical model that established a linear relationship between the BFS slope and temperature, validated through simulations and experiments across various event zone lengths and pulse widths. Ultimately, the system’s measurement capability was improved from 2 to 0.49&#xa0;m, achieving a temperature demodulation of 57.75&#xa0;°C on a 10.2&#xa0;km sensing fiber, with a temperature accuracy approximately ten times higher than that of conventional demodulation schemes. The method of SA-BFS provided a transformative approach to measure physical quantities along the fiber, serving as a valuable tool for distributed optical fiber sensors such as BOTDR and BOTDA.</p>

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Sub pulse length event measurement in BOTDR system using slope assisted Brillouin frequency shift

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月20日

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  • Shuangshuang Liu,
  • Jianzhong Zhang,
  • Zhe Ma,
  • Jinglang Xu,
  • Zhikun Wang,
  • Yubo Zhang,
  • Mingjiang Zhang

摘要

To overcome the limitations by pulse width on the event zone measurement capability, a novel temperature demodulation scheme was proposed and validated to measure sub-pulse length event zones based on the slope-assisted Brillouin frequency shift (SA-BFS). Unlike the conventional BFS-based methods, this approach leverages the BFS slope for temperature demodulation, enabling precise measurement of sub-pulse-length event zones. We developed a theoretical model that established a linear relationship between the BFS slope and temperature, validated through simulations and experiments across various event zone lengths and pulse widths. Ultimately, the system’s measurement capability was improved from 2 to 0.49 m, achieving a temperature demodulation of 57.75 °C on a 10.2 km sensing fiber, with a temperature accuracy approximately ten times higher than that of conventional demodulation schemes. The method of SA-BFS provided a transformative approach to measure physical quantities along the fiber, serving as a valuable tool for distributed optical fiber sensors such as BOTDR and BOTDA.