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Stimulated Brillouin scattering (SBS) in integrated photonic circuits enables a wide range of application from narrow-linewidth lasers, radiofrequency filters to signal processing. In this presentation, we focus on two specific applications: light storage based on acoustic waves and SBS-based distributed sensing.
We demonstrate that storing optical data in acoustic waves is a powerful concept, enabling coherent storage in amplitude and phase with a broad bandwidth in planar waveguides without the need of a resonant structure. External control light pulses define position and storage time and allow for deliberate control of the flow of optically encoded information. We also show that it allows for the simultaneous storage at different frequency channels and that no cross talk between the channels is observed.
This is enabled by our photonic chip platform which provides a record-high Brillouin gain in planar spiral waveguides.
Localizing the Brillouin response to a very short scale allows for a distributed mapping of our waveguide structure. We use Brillouin optical correlation domain analysis, a technique inspired from radar technology, to scan our spiral and straight waveguides with a high spatial resolution of 800 µm. This enables short scale sensing of changes in the refractive index and accurate mapping of hybrid waveguide structures.
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