Abstract
With the aim to find the best-suited host glass for radiation-resistant
erbium-doped fibers (EDF), radiation-induced absorption (RIA) is measured and analyzed
after γ-irradiation to 3.0–4.5 kGy in 18 silica optical fibers with various
concentrations of dopants: Al2O3, P2O5,
GeO2 and Er2O3. The RIA dependence on the content of
Al2O3, P2O5 and
Er2O3 in singly doped fibers is investigated. RIA of fibers
codoped simultaneously with Al2O3 and P2O5
are found to be significantly lower than those of singly
Al2O3-doped fibers. This is explained as the result of the
formation of AlPO4-joins in the silica network. GeO2 codoping of
AlPO4-doped silica is shown to further reduce RIA. Nevertheless, the
application of H2-loading and photobleaching of RIA by 980-nm laser radiation
shows that the AlPO4- and GeO2-codoped silica is outperformed by
P-free Al2O3- and GeO2-codoped silica, which is,
therefore, concluded to be the best host glass composition for radiation resistant
EDFs.
© 2012 IEEE
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