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Granulated Silica Method for the Fiber Preform Production

Institute for Applied Laser, Photonics and Surface Technologies (ALPS), Bern University of Applied Sciences, Pestalozzistrasse 20, CH-3400 Burgdorf, Switzerland
Institute of Applied Physics (IAP), University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
Authors to whom correspondence should be addressed.
Academic Editors: Giancarlo Righini, Shibin Jiang and Francesco Prudenzano
Fibers 2017, 5(3), 24;
Received: 24 April 2017 / Revised: 16 June 2017 / Accepted: 19 June 2017 / Published: 11 July 2017
(This article belongs to the Special Issue Advances in Optical Fibers II)
During the past few years, we have studied the granulated silica method as a versatile and cost effective way of fiber preform production and the sol-gel method. Until now, we have used the sol-gel technology together with an iterative re-melting and milling step in order to produce rare earth or transition metal doped granular material for the granulated silica method. Here, we present that the iterative re-melting (laser-assisted) and milling step is no longer needed to reach a high homogeneity. The sol-gel method also offers a high degree of compositional flexibility with respect to dopants; it further facilitates achieving high concentrations, even in cases when several dopants are used. We employed optical active doped sol-gel derived granulate for the fiber core, whereas pure or index-raised granulated silica has been employed for the cladding. Based on the powder-in-tube technique, where silica glass tubes are appropriately filled with these granular materials, fibers has been directly drawn (“fiber rapid prototyping”), or eventually after an additional optional quality enhancing vitrification step. The powder-in-tube technique is also ideally suited for the preparation of microstructured optical fibers. View Full-Text
Keywords: optical fibers; sol-gel; sol-gel-based granulated silica method; preform; power-in-tube preform; large mode area fiber; active fiber optical fibers; sol-gel; sol-gel-based granulated silica method; preform; power-in-tube preform; large mode area fiber; active fiber
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MDPI and ACS Style

Pilz, S.; Najafi, H.; Ryser, M.; Romano, V. Granulated Silica Method for the Fiber Preform Production. Fibers 2017, 5, 24.

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