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Radiation hardening of pure silica optical fibers by high-pressure hydrogen treatment

: Henschel, H.; Köhn, O.; Weinand, U.

Postprint urn:nbn:de:0011-n-151673 (253 KByte PDF)
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Created on: 25.9.2010

IEEE Transactions on Nuclear Science 49 (2002), No.3, pp.1401-1409
ISSN: 0018-9499
European Conference on Radiation and its Effects on Components and Systems (RADECS) <6, 2001, Grenoble>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer INT ()
radiation hardening; pure silica optical fibers; high-pressure hydrogen treatment; low OH content; attenuation; OH absorption band growth

It was proved that hydrogen (H/sub 2/) treatment, consisting of loading with H/sub 2/ under high pressure and immediate pre-irradiation up to dose values >or= 10/sup 4/ Gy considerably increases the radiation hardness of optical fibers with a pure SiO/sub 2/ core, especially of those with a low OH content. These fibers even show a reduction of their initial attenuation at wavelengths < 700 nm, in contrast to a significant increase between 1200 and 1600 nm (growth of OH absorption bands). Therefore, H/sub 2/ treatment should be restricted to fiber applications in the visible wavelength range, up to about 850 nm. A treatment with highly enriched deuterium should extend the usefulness to wavelengths around 1300 nm.