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.
We demonstrate for the first time the storage of multiple phase and amplitude levels of an optical signal as coherent acoustic phonons. The storage concept is implemented on-chip with a GHz-bandwidth.
On-chip nonlinear optics is a thriving research field, which creates transformative
opportunities for manipulating classical or quantum signals in small-footprint integrated
devices. Since the length scales are short, nonlinear interactions need to be enhanced by
exploiting materials with large nonlinearity in combination with high-Q resonators or slowlight
structures. This, however, often results in simultaneous enhancement of competing
Q2 nonlinear processes, which limit the efficiency and can cause signal distortion. Here, we
exploit the frequency dependence of the optical density-of-states near the edge of a photonic
bandgap to selectively enhance or inhibit nonlinear interactions on a chip. We demonstrate
this concept for one of the strongest nonlinear effects, stimulated Brillouin scattering using a
narrow-band one-dimensional photonic bandgap structure: a Bragg grating. The stimluated
Brillouin scattering enhancement enables the generation of a 15-line Brillouin frequency comb.
In the inhibition case, we achieve stimulated Brillouin scattering free operation at a power
level twice the threshold
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