Abstract
We present both modeling results and experimental data
demonstrating that B$_{2}$O$_{3}$ (boric oxide) can be used as an effective
SBS-suppressive optical fiber codopant due to a very
large acoustic damping coefficient. A Ge-containing
fiber with ${\sim} {\hbox {6}}$ wt% B$_{2}$O$_{3}$ at room temperature has a Brillouin gain
coefficient more than 4 dB lower than that of standard
Ge-doped SMF. These B-doped fibers, unlike standard
Ge-doped SMF, have Brillouin spectra that broaden with
increasing fiber temperature. Modeling parameters
(acoustic velocity, spectral width, etc.) for bulk
B$_{2}$O$_{3}$ based on a fit-to-data are provided. Modeling
results for the B–Ge–Si oxide system
indicate that the bulk material gain falls below
$0.5 \times 10^{-11}$ m/W at 1534 nm near the 1B$_{2}$O$_{3}$:4SiO$_{2}$ molar composition.
© 2011 IEEE
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