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Radiation damage and radiation induced loss in optical fibres

: Henschel, H.; Köhn, O.; Schmidt, H.U.

Fulltext urn:nbn:de:0011-px-307153 (5.2 MByte PDF)
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Copyright 1990 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Created on: 17.9.2011

Greenwell, R.A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber optics reliability. Benign and adverse environments III
Bellingham/Wash.: SPIE, 1990 (SPIE Proceedings Series 1174)
ISBN: 0-8194-0210-9
Fiber Optics Reliability. Benign and Adverse Environments <3, 1989, Boston/Mass.>
Conference Paper, Electronic Publication
Fraunhofer INT ()
continuous irradiation; optical fibres; pulsed irradiation; radiation damage; radiation induced loss; wavelength dependence

The radiation induced loss in optical fibres is initially determined by the preform properties, the fibre draw conditions, and the radiation test parameters. We have found that some fibres change their radiation sensitivity considerably after exposure to high dose values (100000-1000000 rd) and explain this with radiation damage, i.e. the production of new precursors for colour centres in concentrations comparable or even higher than those of the initial ones. To get further informations about the nature of eventually generated new defects, we compared the transient induced loss of damaged and undamaged fibres as well as measured the wavelength dependence of the induced loss with increasing 60Co gamma dose. Some fibres (polymer fibres and OH rich fibres with pure SiO2 core) showed considerable permanent damage, whereas Ge doped fibres (single mode as well as graded index) remained nearly unchanged up to 1000000 rd.