Finite element calculations of inter-modal Brillouin gain between LP0n modes in acoustically-inhomogeneous higher order mode (HOM) fibers are presented. When the pump beam is launched in the LP08 mode, the LP01 mode of the Stokes beam experiences the highest gain, approximately 6.7 dB higher than the peak LP08-LP08 gain. An LP01 Stokes beam experiences successively more Brillouin gain when pumped by higher-order LP0n modes.
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