Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics III
Q 58.1: Poster
Thursday, March 14, 2019, 16:15–18:15, S Atrium Informatik
Short Pulse Photonic-Phononic Memory — •Johannes Piotrowski1,2, Mikołaj K. Schmidt1, Birgit Stiller3, Christopher Poulton4, and Michael Steel1 — 1Macquarie University — 2Universität Potsdam — 3University of Technology Sydney — 4University of Sydney
Stimulated Brillouin Scattering (SBS) coherently transfers energy between optical and acoustic fields confined in waveguides. The acoustic wave acting as a moving grating is scattering light between two optical fields, while their interference pattern induces density fluctuations in the waveguide via electrostriction, building a feedback loop.
SBS is increasingly important in fibre and chip-based optics, with a variety of applications in signal processing necessary for future optical circuits for fast telecommunication, including the option of storing light. Pumping a signal with a counter-propagating strong laser pulse transfers (writes) power of the signal into an acoustic wave travelling at much lower speeds. A second 'read' pulse depletes the acoustic excitation and retrieves the signal. First demonstrations of chip-integrated photonic-phononic memory based on this principle prompt questions about achievable data rate, delay time and storage efficiency.
We extend the analytical description of governing nonlinear coupled-mode equations of SBS beyond the usual slowly varying envelope approximations, including the novel regime of short acoustic pulses down to the picosecond scale. A numerical symmetrized split-step method is implemented to simulate the process, predicting necessary system parameters and explaining spectral features found in experiments.