Abstract
Seven F-doped- and undoped-silica-core optical fibers were produced by the MCVD-method, the
ratio of the O
$_{2}$
and SiCl
$_{4}$
molar flow rates in the vapor-gas mixture during the fabrication of the perform
core being varied among the performs. The fibers were γ-irradiated to 8.1 kGy (0.75 Gy/s),
radiation-induced absorption (RIA) being measured during and after the irradiation in the spectral
range 1.1–1.7 μm. The fiber optical loss spectra were also measured after γ-irradiation to
1.31 MGy. Three RIA mechanisms affecting the near-IR region have been revealed, namely,
short-wavelength RIA tails due to the Cl
$^{0}$
-center and to the self-trapped holes of the second type (STH
$_{2}$
) and a long-wavelength RIA tail due to the self-trapped holes of the first type
(STH
$_{1}$
). STH
$_{2}$
are argued to result from the strain frozen-in in the fiber glass in the fiber
drawing process. The RIA due to STH
$_{1}$
is shown to anticorrelate with the RIA due to STH
$_{2}$
. All the RIA mechanisms revealed are shown to be strongly suppressed by
providing a high O
$_{2}$
excess in the vapor-gas mixture during the perform core synthesis. The O
$_{2}$
-excess technique is therefore proposed as a very promising one for the
development of radiation-resistant fibers.
© 2013 IEEE
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