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<p>The paper presents a&#xa0;hybrid physico-mathematical model for the quantitative analysis and prediction of optical losses in standard fiber-optic cables subjected to mechanical loading. The stress-strain state is calculated by the finite element modeling in ANSYS Mechanical, which is combined with numerical solutions of the Helmholtz equation in COMSOL Multiphysics to describe the light propagation. It is shown that tension and microbending cause the stress redistribution in the fiber core and a&#xa0;change in the refractive index according to ∆<i>n</i> = −0.5<i>n</i><sup>3</sup><i>p</i>ε, leading to an increase in the attenuation coefficient following the exponential law α = α<sub>0</sub>exp(<i>k</i>σ). Numerical results are in good agreement with the experimental data (<i>R</i> = 0.95, deviation &lt; 7%). The developed model is aimed at practical production and diagnostic tasks in fiber-optic network operation implemented in AO ‘Kazakhtelecom’ and the QarTech Innovation and Industrial Hub. The results make it possible to predict the optical degradation without the structural modification of the cable and provide a&#xa0;basis for design of quasi-distributed fiber-optic sensors applicable to telecommunication and energy systems.</p>

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Computer modeling of mechanical and optical effects in standard fiber-Optic cables under mechanical load

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • A. D. Alkina,
  • A. D. Mekhtiyev,
  • E. N. Bilichenko,
  • E. G. Neshina,
  • A. M. Asylbekova

摘要

The paper presents a hybrid physico-mathematical model for the quantitative analysis and prediction of optical losses in standard fiber-optic cables subjected to mechanical loading. The stress-strain state is calculated by the finite element modeling in ANSYS Mechanical, which is combined with numerical solutions of the Helmholtz equation in COMSOL Multiphysics to describe the light propagation. It is shown that tension and microbending cause the stress redistribution in the fiber core and a change in the refractive index according to ∆n = −0.5n3pε, leading to an increase in the attenuation coefficient following the exponential law α = α0exp(kσ). Numerical results are in good agreement with the experimental data (R = 0.95, deviation < 7%). The developed model is aimed at practical production and diagnostic tasks in fiber-optic network operation implemented in AO ‘Kazakhtelecom’ and the QarTech Innovation and Industrial Hub. The results make it possible to predict the optical degradation without the structural modification of the cable and provide a basis for design of quasi-distributed fiber-optic sensors applicable to telecommunication and energy systems.