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The ability to amplify light within silicon waveguides is central to thedevelopment of high-performance silicon photonic device technologies. To thisend, the large optical nonlinearities made possible through stimulatedBrillouin scattering offer a promising avenue for power-efficient all-siliconamplifiers, with recent demonstrations producing several dB of netamplification. However, scaling the degree of amplification to technologicallycompelling levels (>10 dB), necessary for everything from filtering to smallsignal detection, remains an important goal. Here, we significantly enhance theBrillouin amplification process by harnessing an inter-modal Brillouininteraction within a multi-spatial-mode silicon racetrack resonator. Using thisapproach, we demonstrate more than 20 dB of net Brillouin amplification insilicon, advancing state-of-the-art performance by a factor of 30. This degreeof amplification is achieved with modest (~15 mW) continuous-wave pump powersand produces low out-of-band noise. Moreover, we show that this same systembehaves as a unidirectional amplifier, providing more than 28 dB of opticalnonreciprocity without insertion loss in an all-silicon platform. Building onthese results, this device concept opens the door to new types of all-siliconinjection-locked Brillouin lasers, high-performance photonic filters, andwaveguide-compatible distributed optomechanical phenomena.

Resonantly enhanced nonreciprocal silicon Brillouin amplifier