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Proceedings Paper

Hermetically Coated Optical Fibers: Hydrogen Permeation And Fatigue Properties
Author(s): K. S. Kranz; P. J. Lemaire; R. G. Huff; F. V. DiMarcello; K. L. Walker
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Paper Abstract

Hydrogen permeation rates have been measured for fibers coated with a CVD applied amorphous carbon hermetic barrier. The H2 permeation was characterized by measuring optical loss increases at elevated temperatures at both high and low hydrogen pressures. Very low predicted values for the rates of hydrogen permeation over a wide range of operating temperatures were found, with an experimentally determined activation energy of 23.7 kcal/mole. In-situ measurements of loss increases upon exposure to hydrogen have shown the existence of a lag time where no hydrogen reaches the core of the fiber. Fiber strengths for the carbon coated hermetic fibers are typically 500-600 ksi. Fatigue properties are markedly improved by the presence of this type of hermetic coating. Dynamic fatigue results show extremely high n values on the order of 350-1000. Static fatigue tests in 21 ° C air and 50% relative humidity give n values of about 200. This is a great improvement over the fatigue results for non-hermetic fibers which exhibit n values of approximately 20.

Paper Details

Date Published: 26 April 1989
PDF: 12 pages
Proc. SPIE 0992, Fiber Optics Reliability: Benign and Adverse Environments II, (26 April 1989); doi: 10.1117/12.960048
Show Author Affiliations
K. S. Kranz, AT&T Bell Laboratories (United States)
P. J. Lemaire, AT&T Bell Laboratories (United States)
R. G. Huff, AT&T Bell Laboratories (United States)
F. V. DiMarcello, AT&T Bell Laboratories (United States)
K. L. Walker, AT&T Bell Laboratories (United States)

Published in SPIE Proceedings Vol. 0992:
Fiber Optics Reliability: Benign and Adverse Environments II
Roger A. Greenwell; Dilip K. Paul; Shekhar G. Wadekar, Editor(s)

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