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<p>Optical fiber sensors have attracted significant interest in the sensing field. Conventional optical fiber sensors exhibit drawbacks such as fragility and restricted sensitivity, that demand modification. This paper presents a C-shaped optical fiber sensor sensitivity enhancement through design modifications. The fiber is designed and simulated in Wave Optics Module-COMSOL Multiphysics® to analyze the light propagation characteristics and sensor response features by varying core radius, cladding thickness, and operating wavelengths at 1550&#xa0;nm and 1620&#xa0;nm. The study explored sensitivity changes in response to different analyte refractive indices. Simulation results indicate that operating at 1620&#xa0;nm improves sensitivity by 0.1942% while reducing the core radius to 2.9&#xa0;µm at 1550&#xa0;nm enhances sensitivity by 3.48%. The study highlights the importance of design parameters in optimizing sensor performance, with practical constraints favoring the 1550&#xa0;nm wavelength due to component availability and lower attenuation. A study with seawater refractive index range at 1550&#xa0;nm and 1620&#xa0;nm wavelengths showed a linear relationship with sensitivity peaking at 1.347&#xa0;RI. The 1620&#xa0;nm with 2.9&#xa0;µm core radius model offered slightly better sensitivity with the advantage of low attenuation due to water absorption, making it ideal for underwater applications with further development.</p>

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Design and simulation of a C-shaped optical fiber sensor for sensitivity enhancement

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Santhosh kumar Dontha,
  • Kishore Vejandla,
  • Siva Prasad Valluri

摘要

Optical fiber sensors have attracted significant interest in the sensing field. Conventional optical fiber sensors exhibit drawbacks such as fragility and restricted sensitivity, that demand modification. This paper presents a C-shaped optical fiber sensor sensitivity enhancement through design modifications. The fiber is designed and simulated in Wave Optics Module-COMSOL Multiphysics® to analyze the light propagation characteristics and sensor response features by varying core radius, cladding thickness, and operating wavelengths at 1550 nm and 1620 nm. The study explored sensitivity changes in response to different analyte refractive indices. Simulation results indicate that operating at 1620 nm improves sensitivity by 0.1942% while reducing the core radius to 2.9 µm at 1550 nm enhances sensitivity by 3.48%. The study highlights the importance of design parameters in optimizing sensor performance, with practical constraints favoring the 1550 nm wavelength due to component availability and lower attenuation. A study with seawater refractive index range at 1550 nm and 1620 nm wavelengths showed a linear relationship with sensitivity peaking at 1.347 RI. The 1620 nm with 2.9 µm core radius model offered slightly better sensitivity with the advantage of low attenuation due to water absorption, making it ideal for underwater applications with further development.