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Stimulated Brillouin scattering (SBS) has been demonstrated in siliconwaveguides in recent years. However, due to the weak interaction betweenphotons and acoustic phonons in these waveguides, long interaction length istypically necessary. Here, we experimentally show that forward stimulatedBrillouin scattering in a short interaction length of a 20 um radius siliconmicroring resonator could give 1.2 dB peak gain at only 10mW coupled pumppower. The experimental results demonstrate that both optical and acousticmodes can have efficient interaction in a short interaction length. Theobserved Brillouin gain varies with coupled pump power in good agreement withtheoretical prediction. The work shows the potential of SBS in silicon formoving the demonstrated fiber SBS applications to the integrated siliconphotonics platform.

Forward stimulated Brillouin scattering in silicon microring resonators