Fiber Ring Laser Based on Side-Polished Fiber MZI for Enhancing Refractive Index and Torsion Measurement
Fiber Ring Laser Based on Side-Polished Fiber MZI for Enhancing Refractive Index and Torsion Measurement
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基于侧面抛光光纤 MZI 的光纤环形激光器增强折射率和扭转测量
DOI:
10.1109/jsen.2022.3154761
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发表时间:
2022-04
影响因子:
4.3
通讯作者:
Qiang Wu
中科院分区:
文献类型:
--
作者:
Wan Bo;Bin Liu;Juan Liu;Xing-Dao He;Jinhui Yuan;Qiang Wu
A fiber ring laser based on a side-polish fiber Mach-Zehnder interferometer (MZI) for effective improving refractive index (RI) and torsion sensing is proposed and investigated. The side-polished fiber MZI sensor can not only enhance the evanescent wave but also break circular symmetry of optical fiber face section, so it can be used for the surrounding RI and torsion sensing. A spectrum 3 <italic>dB</italic> bandwidth of less than 0.15 <italic>nm</italic> has been achieved which makes the fiber ring laser torsion sensing system to have higher measurement resolution. Experiment results show that the RI and torsion sensitivity of proposed sensor is dependent on the polish depth: the thicker the polish depth, the higher the sensitivity. For a sensor with side polish depth of <inline-formula> <tex-math notation="LaTeX">$47~\mu {m}$ </tex-math></inline-formula>, the measured RI sensitivity reaches −81.36 <italic>nm</italic>/RIU, the torsion sensitivity is as high as −0.019nm/<sup>O</sup>, the sensitivity converted to torsional rate is −0.267 <italic>nm</italic>/(<italic>rad</italic>.<inline-formula> <tex-math notation="LaTeX">${m} ^{-1}$ </tex-math></inline-formula>).
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