Fig. 1: Resonant spiking device circuit diagram.

Excitatory/inhibitory inputs enter in the photodiode labeled E/I. The optical feedback from the drop port of the modulator goes into the feedback photodiode labeled F. The photocurrents are accepted by the input net u and passed to the electrical resonator circuit. The inductors and capacitors in the dashed boxes are biasing components, unrelated to the spiking dynamics. The microring modulator (boxed by the dot dash) has two bus waveguides and a ring waveguide that is flanked by p and n-doped silicon. Its equivalent electrical diagram is also shown in the other dot-dash box. The voltage across the junction capacitor is v_C and the current passing through the resonator inductor is I_L. Though not explicitly simulated in this work, this design is compatible with WDM-based weighting designs.