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Updated: Feb 25, 2026

Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape

Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape

Published on: January 8, 2014

Diffusion and Interface Effects during Preparation of All-Solid Microstructured Fibers.

Kobelke Jens¹, Bierlich Jörg², Wondraczek Katrin³

¹Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Str. 9, D-07745 Jena, Germany. jens.kobelke@ipht-jena.de.

Materials (Basel, Switzerland)

|August 10, 2017

Summary

This study simulates how dopants like germanium and fluorine behave in silica during optical fiber fabrication. Understanding these diffusion and evaporation processes helps optimize preform design to maintain desired optical properties.

Keywords:

fiber manufacturing microstructured fiber photonic crystal fiber

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Last Updated: Feb 25, 2026

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Microfluidic Dry-spinning and Characterization of Regenerated Silk Fibroin Fibers

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Published on: June 12, 2015

Area of Science:

Materials Science
Optical Engineering
Nanotechnology

Background:

All-solid microstructured optical fibers (MOFs) offer flexible optical waveguide designs.
Fabrication involves stacking doped silica rods, with dopants like germanium, phosphorus, boron, and fluorine altering refractive index (RI).
Thermal processing can lead to unwanted chemical reactions and dopant evaporation, deviating from target structures and degrading optical functionality.

Purpose of the Study:

To simulate diffusion and thermal dissociation of dopants in silica rod arrangements during fiber drawing.
To identify geometrical limits for sub-µm dopant structures based on concentration and thermal conditions.
To provide insights for optimizing preform design to prevent alterations in dopant profiles and design parameters.

Main Methods:

Utilizing simulation results to analyze diffusion and thermal dissociation in germanium and fluorine doped silica rod arrangements.
Correlating simulation data with monitored geometrical disturbances in stretched canes and drawn fibers.
Investigating the influence of dopant concentration and thermal conditions on dopant structure geometry.

Main Results:

Simulation results reveal geometrical limits for sub-µm dopant structures.
Dopant profile and RI homogeneity are influenced by diffusion and evaporation equilibrium.
Geometrical disturbances in fibers correlate with simulated dopant behavior.

Conclusions:

Optimized preform design is crucial for maintaining targeted dopant profiles and optical functionality in MOFs.
Understanding dopant diffusion and evaporation dynamics prevents unwanted structural alterations during fiber drawing.
The study provides a framework for predicting and controlling dopant behavior for improved MOF fabrication.