Photonic reservoir computing (RC) is emerging as a competitive candidate for ultra-fast and energy-efficient neuromorphic computing, noted its physical compatibility straightforward training process. However, this widely appreciated form of machine learning typically employs only single hidden layer with feedback loop (FL), which essentially constrains the capability complex task processing poses challenges to integration. Here, we present an integrated deep photonic RC setup based on...

Photonic generation of wideband chaotic signals with time delay signature elimination is investigated experimentally and numerically based on a semiconductor laser (slave laser) optical injection from master laser. The subject to moderate feedback where the strength external-cavity length are fixed, while slave stands alone. experimental results show that successful concealment can be generated in by simply adjusting coupling frequency detuning between two lasers. Furthermore, numerical...

We report on the manipulation of extreme events (EEs) in a slave spin-polarized vertical-cavity surface-emitting laser (spin-VCSEL) subject to chaotic optical injection from master spin-VCSEL. The is free-running but yielding regime with obvious EEs, while originally (i.e., without external injection) operates either continuous-wave (CW), period-one (P1), period-two (P2), or state. systematically investigate influence parameters, i.e., strength and frequency detuning, characteristics EEs....

It is well known that the dynamical characteristics of nano-lasers (NLs) have been extensively studied, but there limited research on chaotic synchronization communication. In this paper, we propose a closed-loop system mutually coupled NLs. Firstly, autocorrelation function employed to evaluate capability conceal time-delayed signature (TDS), and then, based this, specifically analyze effects injection strength, frequency detuning, parameter mismatch two NLs performance, as bidirectional...

Abstract This paper presents an experimental scheme using optical method instead of phase conjugate light. We have implemented a feedback semiconductor laser chaotic system based on the four-wave mixing principle through established fiber platform. Based high-dimensional wideband signals generated by this system, we propose two-channel secure communication feedback, and analyze its delay hiding mechanism synchronization characteristics. The effects parameter mismatch injection strength...

We report on the dynamics of free-running and optically injected VCSELs. In particular, powerful measures including 0-1 test for chaos permutation entropy are used locating chaotic in a VCSEL, which illustrates effects some key parameters region. order to enhance dynamics, output VCSEL (master) is another (slave). Our results show that slave can be greatly enhanced, i.e., both bandwidth complexity, while this occurs only outside injection locking region where correlation between mater lasers...

Time-delay signature (TDS) suppression of an external-cavity semiconductor laser (ECSL) is important for chaos-based applications and has been widely studied in the literature. In this paper, chaotic output ECSL injected into a TDS regenerated time series revisited. The focus current work influence parameter mismatch on evolution, which investigated experimentally compared systematically to simulations. experimental results demonstrate that it much easier achieve desired configuration...

It is well known that nano-lasers (NLs), as important optical components, have attracted widespread attention for their output characteristics. In this paper, the dynamic behavior and time-delay concealment properties of NLs mutually coupled in open-loop, semi-open-loop, closed-loop structures been numerically investigated. We employ bifurcation diagrams 0–1 chaos tests our simulations to quantitatively analyze system introduce autocorrelation function evaluate ability conceal signature...

A large number of studies have been carried out to understand the nonlinear dynamics nanolasers, yet there is a lack comprehensive consideration on optimization chaotic output and its application chaos secure communications. In this paper, we used an optically injected nanolaser structure generate broadband without time-delay signature (TDS), which acts as carrier in proposed communication scheme. Due combination desired TDS suppression enabled by nanolasers two-channel transmission...

In this paper, a method of generating controllable spikes utilizing symmetric semiconductor ring lasers (SRLs) is investigated, and various optical behaviors biological neurons are successfully emulated on faster timescale. We demonstrate the synchronized spike phenomena in two directions, generated both clockwise (CW) counterclockwise (CCW) modes tunable laser (TL)-injected SRL. The size peaks interval between them can be manipulated by adjusting output complex amplitude TL bias current. At...

Optics chaos has been widely studied and its various applications have also demonstrated in recent years. To improve the performance of chaos-based applications, several properties chaotic signals should be evaluated enhanced accordingly. In this paper, we consider a system consisting three cascade-coupled semiconductor ring lasers (SRLs), where master SRL is subjected to conventional (parallel) optical feedback, while output injected intermediate further slave SRL. We focus on time-delay...

The experimental evidence and characterization of time-delay concealment in a semiconductor laser (SL) with dual-chaotic optical injections (DCOIs) are reported. Autocorrelation function permutation entropy employed to extract the signature (TDS). Our results show that both TDSs associated dynamics master lasers or only one two can be concealed SL DCOI, depending on choices injection ratio frequency detuning lights. experiments good agreement simulations. Furthermore, possibility use chaotic...

The randomness and bandwidth enhancement of chaotic signals in optically injected semiconductor lasers (SLs) with dual-path injection from a single master laser are investigated experimentally numerically. It is shown that both the generated slave SL (SSL) can be enhanced significantly, especially for positive frequency detuning, by simply adding an additional path conventional master-slave configuration. region parameter space leading to wideband randomness-enhanced chaos SSL greatly...

We propose an approach to generating nonlinear frequency-modulated (NLFM) microwave waveforms, which is based on controlled period-one (P1) dynamics of optically injected semiconductor laser (OISL). When the optical injection modulated, OISL, originally operates at a P1 oscillation state, acts as voltage-controlled oscillator (VCO). In proposed system, frequency output depends closely strength by modulation voltage input, while electrical signal required generate desired NLFM waveform can be...

We propose and numerically demonstrate wideband high-dimensional chaos signal generation based on optically pumped spin-polarized vertical-cavity surface-emitting lasers (spin-VCSELs). Here, we focus the chaotic characteristics of spin-VCSELs under two scenarios: one is a spin-VCSEL with optical feedback other heterodyning outputs free-running spin-VCSELs. Specifically, systematically investigate influence some key parameters properties, i.e., bandwidth, spectral flatness (SF), time delay...

Abstract In this paper, a novel method is proposed to generate high-quality chaotic signals using three cascade-coupled nano-lasers (NLs), and high-speed, random number sequences. The master NL (MNL) subjected optical feedback, its output injected into the intermediate (INL), which further slave (SNL). simulation, we first adjust proper parameters so that SNL generates signal with large bandwidth time-delay signature concealment. After performing self-delayed differential processing on...

This paper presents a chaotic system based on novel semiconductor nanolasers (NLs), systematically analyzing its region and investigating the influence of key parameters unpredictability output. study found that under optical feedback conditions, NLs generate chaos across wide range parameters, with highly unpredictable completely overlapping region. Further injection into slave lasers enhances output, expanding unpredictability. Additionally, we analyzed impact internal parameter mismatch...

The rapid advancement of photonic technologies has facilitated the development neurons that emulate neuronal functionalities akin to those observed in human brain. Neuronal bursts frequently occur behaviors where information is encoded and transmitted. Here, we present demonstration bursting response activated by an artificial neuron. This neuron utilizes a single vertical-cavity surface-emitting laser (VCSEL) encodes multiple stimuli effectively varying spike count during burst based on...

High speed random number generation (RNG) utilizing a nonlinear optoelectronic oscillator (OEO) is explored experimentally. It has been found that by simply adjusting either the injected optical power or gain of modulator driver, low complexity dynamics such as square wave, and more complex including fully developed chaos can be experimentally achieved. More importantly, physical RNG based on high-speed-oscilloscope measurements pseudo post-processing are implemented in this paper. The...

Spin-polarized vertical-cavity surface-emitting lasers (spin-VCSELs) with birefringence-induced polarization oscillations have been proposed to generate desired photonic microwave signals. Here, we numerically investigate the generation of signals in an optically pumped quantum dot (QD) spin-VCSEL. First, influence intrinsic key parameters on period-one (P1) and properties is discussed. Second, difference between based well (QW) QD spin-VCSELs analyzed by controlling carrier capture rate...

We report on the global dynamics of a free-running vertical-cavity surface-emitting laser (VCSEL) with misalignment between linear phase and amplitude anisotropies due to fact that this case might occur in practice caused unintentionally by minor manufacturing variations or design, virtue high-resolution stability diagrams, where two kinds self-similar structures are revealed. Of interest is Arnold tongue cascades covered multiple distinct periodicities discovered for first time several...