Fig. 4: Accelerator structure and function. | Light: Science & Applications

Fig. 4: Accelerator structure and function.

From: Reconfigurable nonlinear photonic activation function for photonic neural network based on non-volatile opto-resistive RAM switch

Fig. 4

a Simplified schematic of the proposed nonlinear accelerator, corresponding to Fig. 1b. b Circuit diagram of electrical control unit with marked nodes. c Time-series diagram of data obtained in marked nodes over 4 cycles. d–f Working states in nonlinear accelerator at (d) rising state, e dropping state and (f) high resistance state. g–i Nonlinear activation functions output transmission power as a function of normalized input signal power. g–i correspond to sigmoid, softplus and clamped ReLU responses respectively. (ORS Opto-Resistive RAM Switch, ECU Electrical Control Unit, MZI Mach–Zehnder Interferometer, PCM Phase Change Material)

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