Image edge detection with a photonic spiking VCSEL-neuron

Joshua Robertson, Yahui Zhang, Matěj Hejda, Julián Bueno, Shuiying Xiang, Antonio Hurtado

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Abstract

We report both experimentally and in theory on the detection of edge features in digital images with an artificial optical spiking neuron based on a vertical-cavity surface-emitting laser (VCSEL). The latter delivers fast (< 100 ps) neuron-like optical spikes in response to optical inputs pre-processed using convolution techniques; hence representing image feature information with a spiking data output directly in the optical domain. The proposed technique is able to detect target edges of different directionalities in digital images by applying individual kernel operators and can achieve complete image edge detection using gradient magnitude. Importantly, the neuromorphic (brain-like) spiking edge detection of this work uses commercially sourced VCSELs exhibiting responses at sub-nanosecond rates (many orders of magnitude faster than biological neurons) and operating at the important telecom wavelength of 1300 nm; hence making our approach compatible with optical communication and data-centre technologies.

Original languageEnglish
Pages (from-to)37526-37537
Number of pages12
JournalOptics Express
Volume28
Issue number25
Early online date30 Nov 2020
DOIs
Publication statusPublished - 7 Dec 2020

Keywords

  • VCSEL
  • image processing
  • neuromorphic photonics
  • edge detection

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