研究目的
Investigating the mechanisms that drive the incorporation of silica into the fiber core during the fabrication process using the molten core method (MCM) and modeling the evolution of fiber core diameter and compositional profile with time.
研究成果
The paper provides a first investigation into the evolution of properties of fibers drawn using the molten core method (MCM). A diffusion-controlled dissolution mechanism is suggested as the driver for incorporation of silica into the fiber core during the fiber fabrication process and was modeled using first order kinetics and diffusion equations. This simulation was in rather good agreement with experimental data. Future modeling work will include the evolution of dopant concentrations.
研究不足
The study is a first attempt at describing the MCM process through a modeling aspect, and multiple assumptions are made. Future developments based on this model will consider more complex aspects of the fiber draw process not taken into account herein, such as the specific temperature distribution of the draw furnace, the heating element used, the neckdown preform shape, and/or the presence of convective flow induced during drawing.
1：Experimental Design and Method Selection:
The study employed the molten core method (MCM) to fabricate an yttrium aluminosilicate core–silica cladding glass optical fiber. The properties of the fiber were monitored as a function of draw time/length. A diffusion-controlled dissolution mechanism was suggested and modeled using first order kinetics and diffusion equations.
2：Sample Selection and Data Sources:
A 2 weight percent (wt %) erbium-doped yttrium aluminum garnet (Er:YAG) single crystal rod was chosen as an initial precursor material. It was drawn inside a fused silica capillary preform, with a targeted fiber diameter of 125 μm.
3：List of Experimental Equipment and Materials:
Er:YAG crystal precursor, fused silica capillary preform, SEM (HITACHI-6600) for EDX spectroscopy.
4：Experimental Procedures and Operational Workflow:
The preform was placed inside a furnace and heated to high temperatures, enabling the preform to be drawn into a glass clad optical fiber. Fiber segments were collected at different positions along the drawn fiber length and characterized.
5：Data Analysis Methods:
The silica concentration profiles and fiber core diameters were analyzed using EDX spectroscopy coupled with SEM. The evolution of fiber core diameter and compositional profile with time was modeled using first order kinetics and diffusion equations.
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