Relative Refractory Period in an Excitable Semiconductor Laser

Selmi, F.; Braive, Rémy; Beaudoin, G.; Sagnes, I.; Kuszelewicz, R.; Barbay, Sylvain

doi:10.1103/physrevlett.112.183902

Cited by 166 publications

(130 citation statements)

References 24 publications

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“…They display the typical behavior already reported in Ref. [14], i.e., a sharp jump at the excitable threshold and an increase of the excitable threshold for lower pump values. The excitable threshold increase is accompanied with a reduction of the height of the response step, until no more jump is visible as the excitable regime disappears at the benefit of a gain switching regime.…”

Section: Spike Latencysupporting

confidence: 83%

“…The active zone consists of two InGaAs quantum wells for the gain section and one InGaAs quantum well for the SA section. A 4-μm diameter micropillar is then etched and the micropillar is further coated with a thick SiN layer to prevent oxidization and to improve heat dissipation [14]. The micropillar is pumped cw by a fiber-coupled array of laser diodes and focused onto the sample with a microscope objective.…”

Section: Spike Latencymentioning

confidence: 99%

“…This regime may be useful for traditional optical signal processing applications (e.g., logic gates [6]) as well as to build networks for photonics neuromimetic and spike processing operations [7,8] such as spiking pattern recognition [9], self-regenerative memories [10], and coincidence detection [11][12][13]. In a recent work [14], we demonstrated a fast excitable dynamics with response times of the order of 200 ps in a micropillar laser with integrated saturable absorber and studied the absolute and relative refractory periods. This behavior is analogous to the one found in biological neurons but with time scales faster by more than 6 orders of magnitude.…”

Section: Introductionmentioning

confidence: 99%

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Spike latency and response properties of an excitable micropillar laser

et al. 2016

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We present experimental measurements concerning the response of an excitable micropillar laser with saturable absorber to incoherent as well as coherent perturbations. The excitable response is similar to the behavior of spiking neurons but with much faster time scales. It is accompanied by a subnanosecond nonlinear delay that is measured for different bias pump values. This mechanism provides a natural scheme for encoding the strength of an ultrafast stimulus in the response delay of excitable spikes (temporal coding). Moreover, we demonstrate coherent and incoherent perturbations techniques applied to the micropillar with perturbation thresholds in the range of a few femtojoules. Responses to coherent perturbations assess the cascadability of the system. We discuss the physical origin of the responses to single and double perturbations with the help of numerical simulations of the Yamada model and, in particular, unveil possibilities to control the relative refractory period that we recently evidenced in this system. Experimental measurements are compared to both numerical simulations of the Yamada model and analytic expressions obtained in the framework of singular perturbation techniques. This system is thus a good candidate to perform photonic spike processing tasks in the framework of novel neuroinspired computing systems.

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Section: Spike Latencysupporting

confidence: 83%

Section: Spike Latencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spike latency and response properties of an excitable micropillar laser

et al. 2016

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“…However, only the response to a single perturbation has been analyzed and, contrary to many other optical excitable systems where the refractory time has been directly or indirectly observed [19][20][21][22][23], the refractory period of this excitable system has not been measured yet.…”

Section: Introductionmentioning

confidence: 99%

Refractory period of an excitable semiconductor laser with optical injection

et al. 2017

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Injection-locked semiconductor lasers can be brought to a neuron-like excitable regime when parameters are set close to the unlocking transition. Here we study experimentally the response of this system to repeated optical perturbations and observe the existence of a refractory period during which perturbations are not able to elicit an excitable response. The results are analyzed via simulations of a set of dynamical equations which reproduced adequately the experimental results.

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“…The system is highly simplistic, only adding an additional quantum well in order to achieve excitability. In 2014, Selmi et al [46] demonstrated that a similar system experiences a refractory period. Upon initial excitation by an optical pulse, the system remains nonexcitable during its refractory period.…”

Section: Excitable Photonic Devices For Rcmentioning

confidence: 99%

Advances in photonic reservoir computing

2017

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Abstract:We review a novel paradigm that has emerged in analogue neuromorphic optical computing. The goal is to implement a reservoir computer in optics, where information is encoded in the intensity and phase of the optical field. Reservoir computing is a bio-inspired approach especially suited for processing time-dependent information. The reservoir's complex and high-dimensional transient response to the input signal is capable of universal computation. The reservoir does not need to be trained, which makes it very well suited for optics. As such, much of the promise of photonic reservoirs lies in their minimal hardware requirements, a tremendous advantage over other hardware-intensive neural network models. We review the two main approaches to optical reservoir computing: networks implemented with multiple discrete optical nodes and the continuous system of a single nonlinear device coupled to delayed feedback.

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Relative Refractory Period in an Excitable Semiconductor Laser

Cited by 166 publications

References 24 publications

Spike latency and response properties of an excitable micropillar laser

Spike latency and response properties of an excitable micropillar laser

Refractory period of an excitable semiconductor laser with optical injection

Advances in photonic reservoir computing

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