We experimentally show an optoacoustic memory based on Brillouin scattering with one order of magnitude higher storage time that retrieves amplitude and phase information after 120ns. We increase the intrinsic phonon lifetime of a highly nonlinear fiber by a factor of six by cooling the fiber down to 4.2K. We demonstrate the performance enhancement of optoacoustic memory by measuring the amplitude and phase information of an initial data pulse and its corresponding retrieved readout pulse using direct and double homodyne detection. Furthermore, we present the influence of different cryogenic temperatures between 4.2K and 20K on the optoacoustic memory and compare the results with continuous-wave measurements. In conclusion, our work can not only accelerate photonic computing but also advance other applications of stimulated Brillouin scattering that require long phonon lifetimes, such as optoacoustic filters in microwave photonics. In addition, the presented long-lasting sound wave optoacoustic memory is compatible with active acoustic refreshment technique potentially leading to all-optical coherent memory beyond 1 μs.
Stimulated Brillouin scattering (SBS) is a highly efficient nonlinear optical interaction between acoustic waves and light. It enables the mediation of spectrally fine radio-frequency signals, with potential applications in quantum signal processing. Here, we investigate the storage of the state of polarization of light in a silica optical nanofiber (ONF) that guides both optic and acoustic waves. It adds an extra degree of information to Brillouin optoacoustic memories. The ONF possesses multiple acoustic modes. We show promising results with read/write operation for a longitudinal acoustic mode and investigate the TR21 acoustic mode polarization sensitivity.
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