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<p>We report a novel and highly sensitive torsion sensor that integrates a multicore fiber (MCF) within a Sagnac interferometer so that the same MCF segment serves as both the reflective element and the sensing head of a fiber-ring laser. The laser architecture incorporates a distributed reflector implemented as a ZnGa₂O₄-nanocrystal-doped fiber section, which enhances overall system performance. The device exhibits high torsional responsivity over 0°–150°, with distinct behavior across sub-ranges: in 0°–50°, phase analysis yields a sensitivity of 0.08&#xa0;rad/° with R² = 0.991; in 88°–150°, amplitude analysis—under the ring-laser configuration—shows an improvement in sensitivity from 0.2 to 0.5 dBm/° (R² = 0.995). In the intermediate interval (50°–88°) neither phase nor power varies monotonically, so a function-fitting neural network was employed to bridge this gap, achieving a root-mean-square error of 0.06°. The system attains an angular resolution of 0.8°, ensuring accurate torsion estimation across the entire measurement span.</p>

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Optical fiber laser system for torsion measurement using a three-core fiber and a nanocrystal-based reflector

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月29日

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  • Angel I. Correa,
  • Jose R. Vento Alvarez,
  • Marko Galarza,
  • Arturo Sanchez Gonzalez,
  • Romain Dauliat,
  • Raphael Jamier,
  • Philippe Roy,
  • Georges Humbert,
  • Rosa A. Perez-Herrera,
  • Manuel Lopez-Amo

摘要

We report a novel and highly sensitive torsion sensor that integrates a multicore fiber (MCF) within a Sagnac interferometer so that the same MCF segment serves as both the reflective element and the sensing head of a fiber-ring laser. The laser architecture incorporates a distributed reflector implemented as a ZnGa₂O₄-nanocrystal-doped fiber section, which enhances overall system performance. The device exhibits high torsional responsivity over 0°–150°, with distinct behavior across sub-ranges: in 0°–50°, phase analysis yields a sensitivity of 0.08 rad/° with R² = 0.991; in 88°–150°, amplitude analysis—under the ring-laser configuration—shows an improvement in sensitivity from 0.2 to 0.5 dBm/° (R² = 0.995). In the intermediate interval (50°–88°) neither phase nor power varies monotonically, so a function-fitting neural network was employed to bridge this gap, achieving a root-mean-square error of 0.06°. The system attains an angular resolution of 0.8°, ensuring accurate torsion estimation across the entire measurement span.