LAUSR

Neuromorphic photonics is a newparadigm for ultra-fast neuro-inspired optical computing that can revolutionize information processing and artificial intelligence systems. To implement practical photonic neural networks is crucial to identify low-cost energy-efficient laser systems that canmimic neuronal activity. Here we study experimentally the spiking dynamics of a semiconductor laser with optical feedback under periodicmodulation of the pump current, and compare with the dynamics of a neuron that is simulatedwith the stochastic FitzHugh–Nagumomodel, with an applied periodic signal whosewaveform is the same as that used tomodulate the laser current. Sinusoidal and pulsedownwaveforms are tested.We find that the laser response and the neuronal response to the periodic forcing, quantified in terms of the variation of the spike rate with the amplitude andwith the frequency of the forcing signal, is qualitatively similar.We also compare the laser and neuron dynamics using symbolic time series analysis. The characterization of the statistical properties of the relative timing of the spikes in terms of ordinal patterns unveils similarities, and also some differences. Our results indicate that semiconductor lasers with optical feedback can be used as low-cost, energy-efficient photonic neurons, the building blocks of all-optical signal processing systems; however, the length of the external cavity prevents optical feedback on the chip.