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Figure 10: (a) Schematics of device structure and interconnection. (b) Wavelength-dependent conductance change for long-term potentiation and long-term depression. (c) Comparisons of conventional NN and ONN. In conventional NN, the synapses cannot sense the optical information. In ONN, optical sensing functions are added to the synaptic devices, exhibiting wavelength-dependent synaptic weights. (d) Training set and test set for the color-mixed pattern recognition. (e) Comparisons of recognition rate as a function of training epochs in NN and ONN. Reproduced with permission from [64].