An all-optical neuron with sigmoid activation function | Zendy

George Mourgias-Alexandris | Zendy; Apostolos Tsakyridis | Zendy; Nikolaos Passalis | Zendy; Anastasios Tefas | Zendy; Konstantinos Vyrsokinos | Zendy; Nikos Pleros | Zendy

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An all-optical neuron with sigmoid activation function

Author(s) -

George Mourgias-Alexandris,

Apostolos Tsakyridis,

Nikolaos Passalis,

Anastasios Tefas,

Konstantinos Vyrsokinos,

Nikos Pleros

Publication year - 2019

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.27.009620

Subject(s) - sigmoid function , optical amplifier , wavelength division multiplexing , optics , transfer function , optical transfer function , multiplexing , modulation (music) , physics , interferometry , computer science , wavelength , telecommunications , acoustics , artificial neural network , artificial intelligence , laser , electrical engineering , engineering

We present an all-optical neuron that utilizes a logistic sigmoid activation function, using a Wavelength-Division Multiplexing (WDM) input & weighting scheme. The activation function is realized by means of a deeply-saturated differentially-biased Semiconductor Optical Amplifier-Mach-Zehnder Interferometer (SOA-MZI) followed by a SOA-Cross-Gain-Modulation (XGM) gate. Its transfer function is both experimentally and theoretically analyzed, showing excellent agreement between theory and experiment and an almost perfect fitting with a logistic sigmoid function. The optical sigmoid transfer function is then exploited in the experimental demonstration of a photonic neuron, demonstrating successful thresholding over a 100psec-long pulse sequence with 4 different weighted-and-summed power levels.

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