Bit-tunable XOR operation based on photonic spiking neuron

Abstract

The XOR logic operation is an important element for photonic computing, but its implementation is limited by high power consumption, complex determination rule of the output signal and polarization sensitive. By utilizing the spiking excitation characteristics of photonic spiking neuron, we propose a polarization-insensitive XOR operation architecture which has the advantage of the tunable bit interval by changing the delay of feedback loop. We simulatively demonstrate that XOR operation with arbitrary bit interval can be realized with zero-error rate by tuning the variable optical delay line. Besides, when introducing a noise with an SNR = 10 dB or a time jitter of 2μs (10% of the unit length of input spike) to the input spike, the error rate of XOR can still reach zero, showing a strong robustness of our system. Experiment for adjacent-bit XOR operation is further implemented and zero error-rate is achieved, verifying the feasibility of our proposed system.