Stimulated Brillouin scattering drives a coherent interaction between<br> optical signals and acoustic phonons and can be used for storing optical<br> information in acoustic waves. An important consideration arises when<br> multiple optical frequencies are simultaneously employed in the<br> Brillouin process: in this case, the acoustic phonons that are addressed<br> by each optical wavelength can be separated by frequencies far smaller<br> than the acoustic phonon linewidth, potentially leading to cross talk<br> between the optical modes. Here we extend the concept of Brillouin-based<br> light storage to multiple wavelength channels. We experimentally and<br> theoretically show that the accumulated phase mismatch over the length<br> of the spatially extended phonons allows each optical wavelength channel<br> to address a distinct phonon mode, ensuring negligible cross talk and<br> preserving the coherence, even if the phonons overlap in frequency. This<br> phase-mismatch for broad-bandwidth pulses has far-reaching implications<br> allowing dense wavelength multiplexing in Brillouin-based light storage,<br> multifrequency Brillouin sensing and lasing, parallel microwave<br> processing, and quantum photon-phonon interactions. (C) 2019 Author(s).
On-chip correlation-based Brillouin sensing: design, experiment, and
simulation
Atiyeh Zarifi,
Birgit Stiller,
Moritz Merklein,
Yang Liu,
Blair Morrison,
Alvaro Casas-Bedoya,
Guanghui Ren,
Thach G. Nguyen,
Khu Vu, et al.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
36
(1)
146-152
(2019)
| Journal
Wavelength-scale stimulated Brillouin scattering (SBS) waveguides are<br> enabling novel on-chip functionalities. The microscale and nanoscale SBS<br> structures and the complexity of the SBS waveguides require a<br> characterization technique to monitor the local geometry-dependent SBS<br> responses along the waveguide. In this work, we demonstrate an<br> experimental spatial resolution of 500 mu m, which can detect feature<br> sizes down to 200 mu m on a silicon-chalcogenide photonic waveguide<br> using the Brillouin optical correlation domain analysis technique. We<br> provide extensive simulation and analysis of how multiple acoustic and<br> optical modes associated with geometrical variations influence the<br> Brillouin spectrum. (C) 2018 Optical Society of America
Contact
Research Group Birgit Stiller
Max Planck Institute for the Science of Light Staudtstr. 2 91058 Erlangen, Germany
