4.7 Article

A Photonic Recurrent Neuron for Time-Series Classification

Journal

JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 5, Pages 1340-1347

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3038890

Keywords

Photonics; Optical network units; Optical attenuators; Nonlinear optics; Neurons; Optical pulses; Training; Neuromorphic photonics; neuromorphic computing; optical neural networks; recurrent neural networks; programable photonics

Funding

  1. EC through H2020 Projects ICT-NEBULAunderGrant [871658, 871391]

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The research on neuromorphic photonics has shown significant improvement in data rates for neuromorphic computing compared to electronic counterparts. Experimental demonstration of a novel photonic recurrent neuron for successful time-series vector classification at high data speeds highlights the potential for boosting speed and latency performance in time-series AI applications.
Neuromorphic photonics has turned into a key research area for enabling neuromorphic computing at much higher data-rates compared to their electronic counterparts, improving significantly the (multiply-and-accumulate) MAC/sec. At the same time, time-series classification problems comprise a large class of artificial intelligence (AI) applications where speed and latency can have a decisive role in their hardware deployment roadmap, highlighting the need for ultra-fast hardware implementations of simplified recurrent neural networks (RNN) that can be extended in more advanced long-short-term-memory (LSTM) and gated recurrent unit (GRU) machines. Herein, we experimentally demonstrate a novel photonic recurrent neuron (PRN) to classify successfully a time-series vector with 100-psec optical pulses and up to 10 Gb/s data speeds, reporting on the fastest all-optical real-time classifier. Experimental classification of 3-bit optical binary data streams is presented, revealing an average accuracy of >91% and confirming the potential of PRNs to boost speed and latency performance in time-series AI applications.

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