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Effects of Defect Modification and Reduction Techniques on the Radiation Sensitivity of Optical Fibers

Published online by Cambridge University Press:  25 February 2011

T. Wei ,
M. P. Singh ,
W. J. Miniscalco  and
J. A. Wall
T. Wei
Affiliation:
GTE Laboratories Incorporated, 40 Sylvan Road, Waltham, MA 02254
M. P. Singh
Affiliation:
GTE Laboratories Incorporated, 40 Sylvan Road, Waltham, MA 02254
W. J. Miniscalco
Affiliation:
GTE Laboratories Incorporated, 40 Sylvan Road, Waltham, MA 02254
J. A. Wall
Affiliation:
Rome Air Development Center/ESRE, Hanscom AFB, MA 01731
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Abstract

We have investigated the relationship of precursor defects in as-drawn optical fiber to glass composition and processing conditions in order to understand the radiation sensitivity of doped-core optical fiber. Techniques are reported for improving the radiation hardness of graded-index multimode fibers through reducing the concentration of doping- and processing-induced defects as well as modifying the residual defects in as-drawn fiber. Significant decreases in radiation-induced loss have been observed for fibers pretreated with hydrogen. An investigation of the role of drawing-induced defects indicates that a lower draw temperature produces slightly harder fiber. A study of core/clad interfacial stress revealed that such stress does not play a major role in radiation sensitivity.

Measurement techniques included in situ loss measurements at 850 nm and spectral loss measurements before and after -γ irradiation. In addition, photoluminescence proved to be an effective tool for characterizing specific defect centers. It was found for Ge/P-codoped fibers that the luminescence band at 650 nm attributed to drawing/radiation induced centers has an inverse correlation with induced loss. Previously unreported emission bands have been observed, including one at 720 nm which may be related to fluorine doping.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 88: Symposium P – Optical Fiber Materials and Properties , 1986 , 207
Copyright
Copyright © Materials Research Society 1987

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References

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