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Proceedings Paper

Effect Of Fluorine Doping On Radiation Hardness Of Graded Index Optical Fibers
Author(s): T. Wei; M. P. Singh; W. J. Miniscalco; P. I. K. Onorato; J. A. Wall
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Paper Abstract

We report an experimental and theoretical investigation of the effects of doping and processing on precursor defects in graded index multimode fibers. Fabrication parameters that significantly influence radiation sensitivity have been identified. In particular, we examined the role of fluorine doping in defect formation and its relationship to radiation sensitivity. The experimental effort included fiber fabrication and radiation-induced loss measurements on graded index, Ge-doped core fibers. Fluorine was added to the core and/or the cladding of test fibers. Two critical parameters, barrier layer thickness and core dopants, have been identified and correlate with induced loss. In addition, the reproducibility of both fiber fabrication and measurement with respect to induced loss has been tested and found to be excellent. Induced loss was found to be proportional to Ge concentration in the core; however, the trend with fluorine doping was less clear. The experimental results are consistent with molecular dynamics simulations which indicate the types and numbers of structural defects in the glasses. The simulations revealed significant differences in defect types and concentrations among glass corn-positions that included pure silica, Ge-doped silica, and Ge/F-codoped silica. Fluorine codoping decreases the number of germanium-related defects but increases the number of defects associated with silicon.

Paper Details

Date Published: 1 January 1987
PDF: 5 pages
Proc. SPIE 0842, Fiber Optics Reliability: Benign and Adverse Environments, (1 January 1987); doi: 10.1117/12.968190
Show Author Affiliations
T. Wei, GTE Laboratories Incorporated (United States)
M. P. Singh, GTE Laboratories Incorporated (United States)
W. J. Miniscalco, GTE Laboratories Incorporated (United States)
P. I. K. Onorato, PIKO Associates (United States)
J. A. Wall, Rome Air Development Center/ESRE (United States)


Published in SPIE Proceedings Vol. 0842:
Fiber Optics Reliability: Benign and Adverse Environments
Dilip K. Paul, Editor(s)

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