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Macro-bending influence on radiation induced attenuation measurement in optical fibres

: Guillermain, Elisa; Kuhnhenn, Jochen; Ricci, Daniel; Weinand, Udo


IEEE Transactions on Nuclear Science 61 (2014), No.4, pp.1834-1837
ISSN: 0018-9499
Journal Article
Fraunhofer INT ()
bending radius; optical fibre; radiation effects; radiation induced attenuation; RIA

Influence of the bending radius on the measurement of radiation induced attenuation in glass optical fibres is discussed in this paper. Radiation induced attenuation measured in two single-mode fibre types shows discrepancies when coiled around a low bending radius spool: the observed attenuation is lower than expected. A series of dedicated tests reveals that this invalid measurement is related to the displacement of the mode field towards the cladding when the fibre is bent with a low radius, and to the different radiation resistances of the core and cladding glasses. For irradiation tests of optical fibres, the spool radius should therefore be carefully chosen.