The stimulated Brillouin scattering (SBS) gain efficiencies were measured in the LP08 and LP01 modes of a higher-order-mode optical fiber. Gain efficiencies CB of 0.0085 and 0.20 (m-W)-1 were measured for the LP08 and LP01 modes at 1083 nm, respectively. CB is inversely proportional to the optical effective area Aeff and the same core-localized acoustic phonon seeds the SBS process in each case. An acoustic modal analysis and a distributed phenomenological model are presented to facilitate the data analysis and interpretation. The LP08 mode exhibits a threshold power-length product of 2.5 kW-m.
© 2007 Optical Society of America
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