ALL-OPTICAL ULTRAFAST NONLINEAR ACTIVATION FUNCTIONS FOR DEEP LEARNING
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United States of America
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Issued Date -
Dec 19, 2024
app pub date -
Oct 25, 2022
filing date -
Oct 25, 2022
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Abstract
A device implementing a nonlinear activation function including a material having nonlinear susceptibility phase-matching a coherent nonlinear interaction involving a signal comprising a signal wavelength and a bias comprising a bias wavelength, so that (1) a first phase difference between the signal and the bias induces the interaction comprising second harmonic generation (generating a second harmonic of the bias wavelength) or sum frequency generation (generating a sum frequency of the bias and the signal, and (2) a second phase difference between the signal and the bias induces the interaction comprising parametric amplification amplifying the bias and attenuating the signal. A positive input to the nonlinear activation function is represented by the signal having an input energy and the first phase difference. A negative input is represented by second phase difference. The output is an output energy of the signal as function of the input energy.
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