Abstract
The structure and radiation sensitivities of three different pure-silica-core
fluorine-doped-cladding optical fibers, made from the same original preform,
were investigated by several experimental techniques. The fibers were obtained
by changing the drawing speed and tension in the typical ranges of values
used for the radiation-tolerant waveguides. The Raman spectroscopy revealed
no significant difference among the fibers before irradiation. At variance,
the comparison between the fibers and their associated preform highlighted
an increase in the amplitude of the D2 band that is related to the concentration
of three-member rings. Moreover, in the zones where the D2 increase is larger,
we observed that the R band peak shifts to higher energy values. The larger
shifts are detected in the fluorine-doped cladding. These data suggest higher
values of fictive temperature and density in the fibers with respect to the
associated preform. The study of the concentrations of γ-ray induced nonbridging oxygen
hole centers and E'Si centers provided no evidence for significant dependence
on the investigated drawing conditions. Under γ-rays, a linear relation between
the concentrations of these two defects is observed. These concentrations
increase sublinearly with the dose suggesting the breaking of the Si–O–Si
strained bonds as the main generation channel. Finally, under X-rays, we observed
that Cl-related defects are mainly responsible for the induced absorption
at about 3.5 eV. These defects are unstable at room temperature and a bleaching
of their related attenuation is observed 1 h after the end of the irradiation.
© 2012 IEEE
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