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Optical Spectra of Silica Core Optical Fibers Exposed to Hydrogen

Published online by Cambridge University Press:  25 February 2011

P. J. Lemaire  and
M. D. Decoteau
P. J. Lemaire
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ, 07974
M. D. Decoteau
Affiliation:
Dept. Materials Science and Eng., Univ. California, Berkeley CA., 94720.
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Abstract

The reaction of H2 with undoped silica core fibers was evaluated by means of “in situ” spectral loss measurements. Drawing induced loss peaks at 0.63 μm decreased rapidly upon exposure to hydrogen. Simultaneous loss increases at 1.39 and 1.53 μm suggest that H2 reacts at nonbridging oxygens and oxygen vacancies created during the drawing process, forming SiOH and SiH. The 1.53 μm SiH peak slowly decayed after its initially rapid growth, indicating that SiH is not thermodynamically stable in silica. The concentration of drawing induced defects is estimated to be on the order of 100 ppb, based on the time required for H2 to diffuse to the fiber core. The appearance of peaks at 1.45 μm suggests that HF is formed by reaction of H2 in the fluorine doped cladding of the fibers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 88: Symposium P – Optical Fiber Materials and Properties , 1986 , 225
Copyright
Copyright © Materials Research Society 1987

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References

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