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Influence of fiber composition and grating fabrication on the radiation sensitivity of fiber Bragg gratings

: Henschel, H.; Höffgen, S.K.; Krebber, K.; Kuhnhenn, J.; Weinand, U.


IEEE Transactions on Nuclear Science 55 (2008), Nr.4, S.2235-2242
ISSN: 0018-9499
Fraunhofer INT ()
fibre bragg grating; gamma radiation; optical fiber sensor; radiation effect

The radiation-induced Bragg wavelength shift (BWS) was measured with type I gratings made of 12 fibers with very different composition, i.e., of fibers with an extremely different radiation-induced attenuation. With two of the fibers fabrication parameters like laser intensity, hydrogen loading, and annealing conditions after grating inscription were varied. With another fiber type I and type II gratings were made by a completely different process. With gratings made under identical conditions of the 12 fibers the radiation-induced BWS only varied by about a factor of three. Varying the fabrication parameters led to BWS differences up to nearly a factor of ten.