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Brillouin Gain Reduction Via B _{2} O _{3} Doping

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1 Author(s)
Dragic, P.D. ; Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA

We present both modeling results and experimental data demonstrating that B2O3 (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 ~6 wt% B2O3 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 B2O3 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 0.5×10-11 m/W at 1534 nm near the 1B2O3:4SiO2 molar composition.

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Lightwave Technology, Journal of  (Volume:29 ,  Issue: 7 )