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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