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Article

Insights and Aspects to the Modeling of the Molten Core Method for Optical Fiber Fabrication

1
Institut de Chimie Moléculaire et des Matériaux d’Orsay (ICMMO), Université Paris-Sud, Université Paris-Saclay, CNRS, 91400 Orsay, France
2
Center for Optical Materials Science and Engineering Technologies (COMSET) and the Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA
3
Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
4
Coherent Nufern Incorporated, East Granby, CT 06026, USA
*
Author to whom correspondence should be addressed.
Materials 2019, 12(18), 2898; https://doi.org/10.3390/ma12182898
Received: 1 August 2019 / Revised: 23 August 2019 / Accepted: 5 September 2019 / Published: 7 September 2019
The molten core method (MCM) is a versatile technique to fabricate a wide variety of optical fiber core compositions ranging from novel glasses to crystalline semiconductors. One common feature of the MCM is an interaction between the molten core and softened glass cladding during the draw process, which often leads to compositional modification between the original preform and the drawn fiber. This causes the final fiber core diameter, core composition, and associated refractive index profile to vary over time and longitudinally along the fiber. Though not always detrimental to performance, these variations must, nonetheless, be anticipated and controlled as they directly impact fiber properties (e.g., numerical aperture, effective area). As an exemplar to better understand the underlying mechanisms, a silica-cladding, YAG-derived yttrium aluminosilicate glass optical fiber was fabricated and its properties (core diameter, silica concentration profile) were monitored as a function of draw time/length. It was found that diffusion-controlled dissolution of silica into the molten core agreed well with the observations. Following this, a set of first order kinetics equations and diffusion equation using Fick’s second law was employed as an initial effort to model the evolution of fiber core diameter and compositional profile with time. From these trends, further insights into other compositional systems and control schemes are provided. View Full-Text
Keywords: molten core method; dissolution; diffusion; optical fiber molten core method; dissolution; diffusion; optical fiber
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MDPI and ACS Style

Cavillon, M.; Dragic, P.; Faugas, B.; Hawkins, T.W.; Ballato, J. Insights and Aspects to the Modeling of the Molten Core Method for Optical Fiber Fabrication. Materials 2019, 12, 2898. https://doi.org/10.3390/ma12182898

AMA Style

Cavillon M, Dragic P, Faugas B, Hawkins TW, Ballato J. Insights and Aspects to the Modeling of the Molten Core Method for Optical Fiber Fabrication. Materials. 2019; 12(18):2898. https://doi.org/10.3390/ma12182898

Chicago/Turabian Style

Cavillon, Maxime; Dragic, Peter; Faugas, Benoit; Hawkins, Thomas W.; Ballato, John. 2019. "Insights and Aspects to the Modeling of the Molten Core Method for Optical Fiber Fabrication" Materials 12, no. 18: 2898. https://doi.org/10.3390/ma12182898

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