We propose an approach for implementing spike-based all-optical fast neuromorphic exclusive OR (XOR) operation using a single vertical-cavity surface-emitting laser (VCSEL). Based on the polarization mode competition in the VCSEL under the influence of dual-polarization optical injections, the XOR operation is realized. Here, the inputs for the logic operations are concurrently injected into the orthogonal polarization modes of the VCSEL-neuron in the form of a square wave, achieving high stability and accuracy. The spike-based XOR operation approaches a 0.8 gigahertz (GHz) rate within only one photonic neuron, which is 3.2 times faster than that of the vertical-cavity semiconductor optical amplifier (VCSOA)- neuron. Furthermore, the feasibility of employing the XOR operations in both discrete and continuous tasks has been verified. Our approach aligns more congruently with the processing method of biological neurons for XOR operation tasks, thereby demonstrating great potential for future photonic neural computing.
In this paper, we study the changes in the dynamic state and bandwidth of spin-polarized vertical-cavity surface-emitting lasers (VCSELs) in the free-running state when they are injected by another spin-VCSEL in different working states. The study theoretically investigates the chaos interval, bandwidth change, and complexity change concerning continuous wave (CW) injection, period-one (P1) injection, and period-two (P2) injections. The simulation results indicate that modifications to the external control parameters significantly affect the dynamic range of the spin-VCSEL, leading to an expansion of the chaotic range as the complexity of the external injection terms increases. Finally, by carefully modifying the external control parameters, it becomes feasible to operate the spin-VCSEL in a desired state.
We report on the possibility of synchronizing two free-running quantum dot spin-polarized vertical-cavity surface-emitting lasers (QD spin-VCSELs) in a master-slave configuration. Their dynamics are studied by simulating the modified spin-flip model, and various dynamical regions are evaluated with the help of a one-parameter bifurcation technique. We show that, under proper injection conditions, the two QD spin-VCSELs can achieve high-quality chaos synchronization. The current study paves the way for the applications of QD spin-VCSELs to chaos-based communication and secure key distribution.
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