Dynamics of Evanescently-Coupled Laser Pairs With Unequal Pumping: Analysis Using a Three-Variable Reduction of the Coupled Rate Equations

Adams, M. J.; Al-Seyab, R.; Henning, I.D.; Susanto, Hadi; Vaughan, M. P.

doi:10.1109/jstqe.2021.3076083

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…1-4 as well as analytic expressions for the boundaries of regions of stability have been presented [31]. This work has been extended to account for unequal pumping by developing a 3-variable reduction of the coupled mode equations for real symmetric weak coupling which yields approximate closed-form steadystate solutions and expressions for the stability boundaries [44]. The explicit result for the saddle-node (SN) bifurcation in [44] can be modified to apply to complex coupling rates, when it becomes:…”

Section: Theorymentioning

confidence: 99%

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Spiking Behaviour in Laterally-Coupled Pairs of VCSELs With Applications in Neuromorphic Photonics

Hejda

Vaughan

Henning

et al. 2023

IEEE J. Select. Topics Quantum Electron.

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We report a theoretical study on laterally-coupled pairs of vertical-cavity surface-emitting lasers (VCSELs) operated under conditions that generate or suppress high-speed optical spiking regimes, and show their potential in exemplar functionalities for use in photonic neuromorphic computing systems. The VCSEL numerical analysis is based on a system of five coupled mode equations, which, for the case of weak coupling, are reduced to a set of three equations that predict the saddle-node stability boundary in terms of device parameters and operating conditions. These results guide numerical simulation to demonstrate multiple neuron-like dynamics, including single-and multiple-spike emission, spiking inhibition, and rebound spiking directly in the optical domain. Importantly, these behaviours are obtained at sub-nanosecond rates, hence multiple orders of magnitude faster than the millisecond timescales of biological neurons. The mechanisms responsible are explained by reference to appropriate phase portraits. The coupled VCSELs model is then used for demonstration of high-speed, all-optical digital-tospiking encoding and for representation of digital image data using rate-coded spike trains.

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Section: Theorymentioning

confidence: 99%

“…Fig. 2 of the normalised pump Q A , intensities I j = Y 2 j (j = A, B), phase ϕ/2π and ψ defined [44] by:…”

Section: B Rebound Spikingmentioning

confidence: 99%

Spiking Behaviour in Laterally-Coupled Pairs of VCSELs With Applications in Neuromorphic Photonics

Hejda

Vaughan

Henning

et al. 2023

IEEE J. Select. Topics Quantum Electron.

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Routes to chaos in a class-B laser coupled to a neutral resonator

2022

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Time-Delayed Reservoir Computing Based on a Two-Element Phased Laser Array for Image Identification

et al. 2021

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We report on a simple approach of time-delayed reservoir computing (RC) based on a two-element phased laser array for image identification. Here the phased laser array with optical feedback and injection is trained according to the representative characteristics extracted through histograms of oriented gradients. These characteristic vectors are multiplied by a random mask signal to form input data, which are subsequently trained in the reservoir. By optimizing the parameters of the RC, we achieve an identification accuracy of 97.44% on the MNIST dataset and 85.46% on the Fashion-MNIST dataset. These results indicate that our proposed RC indeed allows accurate classification of handwritten digit and fashion production. Moreover, we further forecast an RC scheme based on a larger-scale phased laser array, which is expected to tackle more complex tasks at a high speed. Our work offers a possibility for advanced image processing using highly integrated neuromorphic photonic systems.

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Dynamics of Evanescently-Coupled Laser Pairs With Unequal Pumping: Analysis Using a Three-Variable Reduction of the Coupled Rate Equations

Abstract: Dynamics of evanescentlycoupled laser pairs with unequal pumping: analysis using a three-variable reduction of the coupled rate equations. IEEE Journal of Selected Topics in Quantum Electronics.

Cited by 4 publications

References 26 publications

Spiking Behaviour in Laterally-Coupled Pairs of VCSELs With Applications in Neuromorphic Photonics

Spiking Behaviour in Laterally-Coupled Pairs of VCSELs With Applications in Neuromorphic Photonics

Routes to chaos in a class-B laser coupled to a neutral resonator

Time-Delayed Reservoir Computing Based on a Two-Element Phased Laser Array for Image Identification

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