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<p>The present research investigates the impact of drawing temperature on the refractive index of germanium-doped (9&#xa0;mol% GeO<sub>2</sub>) silica core single-mode optical fibers and effect of their bending on optical losses. A preform for fiber drawing was fabricated using the modified chemical vapor deposition method, and the preform outer surface was cladded with a borosilicate layer containing 1&#xa0;mol% B<sub>2</sub>O<sub>3</sub>. The 125&#xa0;μm-diameter fiber with the 5&#xa0;μm-thick borosilicate cladding was coated with epoxy acrylate with a thickness of 65&#xa0;μm. As the drawing temperature decreased from 2100&#xa0;°C to 1850&#xa0;°C, the refractive index of the core increased by approximately 0.002, and the cutoff wavelength for the higher-order mode shifted from 1.3&#xa0;μm to 1.5&#xa0;μm. Additionally, bending-induced fiber optical losses significantly reduced. These refractive index variations are attributed to the development of axial compressive stresses, which result from enhanced pulling forces during fiber drawing. We present a method to estimate refractive index changes in germanosilicate fiber cores as a function of the applied drawing force.</p>

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Impact of fiber drawing temperature on optical fiber refractive index

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Mikhail Eronyan,
  • Marina Tsibinogina,
  • Denis Glita,
  • Alexander Untilov,
  • Mikhail Likhachev

摘要

The present research investigates the impact of drawing temperature on the refractive index of germanium-doped (9 mol% GeO2) silica core single-mode optical fibers and effect of their bending on optical losses. A preform for fiber drawing was fabricated using the modified chemical vapor deposition method, and the preform outer surface was cladded with a borosilicate layer containing 1 mol% B2O3. The 125 μm-diameter fiber with the 5 μm-thick borosilicate cladding was coated with epoxy acrylate with a thickness of 65 μm. As the drawing temperature decreased from 2100 °C to 1850 °C, the refractive index of the core increased by approximately 0.002, and the cutoff wavelength for the higher-order mode shifted from 1.3 μm to 1.5 μm. Additionally, bending-induced fiber optical losses significantly reduced. These refractive index variations are attributed to the development of axial compressive stresses, which result from enhanced pulling forces during fiber drawing. We present a method to estimate refractive index changes in germanosilicate fiber cores as a function of the applied drawing force.