Table of Contents
Journal of Photonics
Volume 2014, Article ID 645207, 11 pages
http://dx.doi.org/10.1155/2014/645207
Research Article

Heat Conduction Modeling of Fiber Fuse in Single-Mode Optical Fibers

Ofra Project, Iruma 358-0023, Japan

Received 16 September 2013; Revised 28 December 2013; Accepted 8 January 2014; Published 24 February 2014

Academic Editor: Jorge Diego Marconi

Copyright © 2014 Yoshito Shuto. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The unsteady-state thermal conduction process in single-mode optical fiber was studied theoretically with the explicit finite-difference method. We assumed that the vitreous silica optical fiber underwent pyrolysis at elevated temperatures to form ( ). We also proposed a model in which the optical absorption coefficient of the core layer increased with increasing molar concentration of . The core-center temperature changed suddenly and reached over  K when a 1.064-μm laser power of 2 W was input into a short core layer of 40 μm length, which was heated at 2923 K. This thermal wave, that is, a fiber fuse, increased in size and propagated toward the light source at a rate of about 0.54 m/s. The calculated propagation velocity of the fiber fuse was in agreement with the experimental value. Moreover, the average temperature of the radiated region of the core layer gradually approached a temperature of about 5700 K. It was found that the final average temperature was close to the experimentally reported values.