4.7 Article

Fiber Ring Laser Based on Side-Polished Fiber MZI for Enhancing Refractive Index and Torsion Measurement

Journal

IEEE SENSORS JOURNAL
Volume 22, Issue 8, Pages 7779-7784

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2022.3154761

Keywords

Optical fiber sensors; Optical fibers; Sensors; Erbium-doped fiber lasers; Ring lasers; Optical fiber networks; Sensitivity; Erbium-doped fiber ring laser; Mach-Zehnder interference; side-polished fiber; refractive index (RI) sensing; torsion sensing

Funding

  1. National Natural Science Foundation of China (NSFC) [11864025, 62175097, 62065013]
  2. Natural Science Foundation of Jiangxi Province [20212BAB202024]
  3. KeyResearch and Development Projects of theMinistry of Science and Technology of China [2018YFE0115700]

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A fiber ring laser based on a side-polish fiber Mach-Zehnder interferometer is proposed for improving refractive index and torsion sensing. The experimental results show that the side-polished fiber MZI sensor has high sensitivity in measuring refractive index and torsion, achieving higher measurement resolution.
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 dB bandwidth of less than 0.15 nm 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 47 mu m, the measured RI sensitivity reaches -81.36 nm/RIU, the torsion sensitivity is as high as -0.019nm/(O), the sensitivity converted to torsional rate is -0.267 nm/(rad.m(-1)).

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