Low-Loss Photonic Reservoir Computing with Multimode Photonic Integrated Circuits.
Andrew Katumba, Jelle Heyvaert, Bendix Schneider, Sarah Uvin, Joni Dambre, Peter Bienstman
Author Information
Andrew Katumba: Photonics Research Group, Department of Information Technology, Ghent University - imec, Ghent, Belgium. andrew.katumba@ugent.be. ORCID
Jelle Heyvaert: Photonics Research Group, Department of Information Technology, Ghent University - imec, Ghent, Belgium.
Bendix Schneider: Photonics Research Group, Department of Information Technology, Ghent University - imec, Ghent, Belgium.
Sarah Uvin: Photonics Research Group, Department of Information Technology, Ghent University - imec, Ghent, Belgium.
Joni Dambre: IDLab, Department of Electronics and Information Systems, Ghent University - imec, Ghent, Belgium.
Peter Bienstman: Photonics Research Group, Department of Information Technology, Ghent University - imec, Ghent, Belgium.
We present a numerical study of a passive integrated photonics reservoir computing platform based on multimodal Y-junctions. We propose a novel design of this junction where the level of adiabaticity is carefully tailored to capture the radiation loss in higher-order modes, while at the same time providing additional mode mixing that increases the richness of the reservoir dynamics. With this design, we report an overall average combination efficiency of 61% compared to the standard 50% for the single-mode case. We demonstrate that with this design, much more power is able to reach the distant nodes of the reservoir, leading to increased scaling prospects. We use the example of a header recognition task to confirm that such a reservoir can be used for bit-level processing tasks. The design itself is CMOS-compatible and can be fabricated through the known standard fabrication procedures.
