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Fig. 8 | PhotoniX

Fig. 8

From: Perspective on photonic memristive neuromorphic computing

Fig. 8

a Schematic of a photonic network consisting of N pre-synaptic input neurons and one post-synaptic output neuron connected via PCM synapses. PCM cells weight the input spikes and a wavelength division multiplexer sums them up. The PCM cell on the ring resonator switches when the integrated power of the post-synaptic spikes surpasses a certain threshold, and an output spike is generated. b Photonic circuit diagram of an integrated optical neuron with symbol block shown in the inset (top right). Using different wavelength inputs and outputs, it is possible to connect these blocks to larger networks. c Scanning electron microscope image of the of a ring resonator used to implement the activation function. The resonance condition of the resonator can be tuned by switching the PCM cell on top of the waveguide crossing. The waveguide on the bottom of the ring is used to probe the resonance and generate an output pulse. Reproduced from ref. [72] with permission

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