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Related Experiment Video

Updated: Jun 22, 2026

Fabricating Metamaterials Using the Fiber Drawing Method
11:57

Fabricating Metamaterials Using the Fiber Drawing Method

Published on: October 18, 2012

Dopant diffusion during optical fibre drawing.

K Lyytikainen, S Huntington, A Carter

    Optics Express
    |May 29, 2009
    PubMed
    Summary

    Germanium (Ge) and Fluorine (F) diffusion in silica optical fibers occurs at high temperatures and low draw speeds. Most diffusion happens in the neck-down region during fiber drawing.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Solid-State Physics

    Background:

    • Silica optical fibers are crucial for telecommunications.
    • Controlling dopant diffusion (Ge, F) is vital for fiber performance.
    • Understanding diffusion mechanisms during fiber drawing is essential.

    Purpose of the Study:

    • To investigate the diffusion behavior of Germanium (Ge) and Fluorine (F) in silica optical fibers.
    • To determine the influence of drawing conditions on dopant diffusion.
    • To validate diffusion models with experimental data.

    Main Methods:

    • Fiber preforms were drawn under varied conditions.
    • Etching and Atomic Force Microscopy (AFM) were used for analysis.
    • Results were compared with Refractive Index Profiles (RIP) of the fibers.

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    The Diffusion of Passive Tracers in Laminar Shear Flow
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    Published on: May 1, 2018

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    Last Updated: Jun 22, 2026

    Fabricating Metamaterials Using the Fiber Drawing Method
    11:57

    Fabricating Metamaterials Using the Fiber Drawing Method

    Published on: October 18, 2012

    The Diffusion of Passive Tracers in Laminar Shear Flow
    08:01

    The Diffusion of Passive Tracers in Laminar Shear Flow

    Published on: May 1, 2018

    Main Results:

    • Significant diffusion of Ge and F was observed at 2100°C and a draw speed of 10 m/min.
    • Diffusion simulations indicated the neck-down region as the primary site for diffusion.
    • Draw temperature and preform feed rate significantly impacted diffusion, while preform diameter had minimal effect.

    Conclusions:

    • High temperatures and low draw speeds promote Ge and F diffusion in silica optical fibers.
    • The neck-down region is critical for dopant diffusion during the drawing process.
    • Optimizing draw temperature and feed rate is key to controlling dopant profiles.