We develop an unprecedented 3D pulsed chaos lidar system for potential intelligent machinery applications. Benefited from the random nature of chaos, conventional CW lidars already possess excellent anti-jamming and anti-interference capabilities have no range ambiguity. In our system, we further employ self-homodyning time gating to generate a homodyned boost energy-utilization efficiency. Compared original show that improves detection SNR by more than 20 dB. With sampling rate just 1.25...

The monolithic integration of InGaN-based micro-LEDs is being interest toward developing full-color micro-displays. However, the color stability in InGaN red micro-LED an issue that needs to be addressed. In this study, modified distributed Bragg reflectors (DBRs) were designed reduce transmission undesired spectra. calculated optical properties with conventional and DBRs have been analyzed, respectively. CIE 1931 space encoded 8-bit RGB values are exhibited for quantitative assessment...

This work reports on an investigation of the dynamics $1.3\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\text{m}$ epitaxial quantum dot (QD) lasers silicon subject to delayed optical feedback. Operating device under different feedback conditions, we experimentally identify various dynamical states periodic oscillations. In long-cavity regime, remains chaos-free up $\ensuremath{\approx}70% (\ensuremath{-}1.55\phantom{\rule{0.16em}{0ex}}\mathrm{dB})$ strength. remarkable result is in agreement with...

Abstract We characterize a new chaos lidar system configuration and demonstrate its capability for high-speed 3D imaging. Compared with homodyned scheme employing single-element avalanche photodetectors (APDs), the proposed utilizes fiber Bragg grating quadrant APDs to substantially increase throughput, frame rate, field-of-view. By quantitatively analyzing signal-to-noise ratio, peak-to-standard deviation of sidelobe level, precision, detection probability, we show that has better...

We investigated the characteristics of chaos-modulated pulses amplified by a pulsed master oscillator power amplifier (MOPA) for application in new chaos lidar system this study. Compared with loss modulation applied continuous-wave (CW) time-gating scheme, MOPA scheme could generate much higher peak power, resulting an improved peak-to-standard deviation sidelobe level (PSL std ) correlation-based detection. When was at duty cycle 0.1% and pulse repetition frequency 20 kHz, which correspond...

In this study, we propose and evaluate a 3D multi-input multi-output (MIMO) pulsed chaos lidar based on time-division multiplexing. By time-gating waveform sequentially at different times, chaos-modulated pulses for channels that are uncorrelated with each other can be generated. To quantitatively the anti-interference/jamming capability, investigated detection performance of MIMO under jamming strengths overlapped ratios between signal pulses. The overall probabilities conventional...

Magnetohydrodynamic(MHD) turbulence displays velocity anisotropies which reflect the direction of magnetic field. This anisotropy has led to development a number statistical techniques for studying fields in interstellar medium. In this paper, we review and compare three that use radio position-position-velocity data determining field strength morphology : correlation function (CFA), Principal Component Analysis Anisotropies (PCAA), more recent Velocity Gradient Technique (VGT). We these...

We generate and analyze chaos-modulated pulses based on a gain-switched semiconductor laser subject to delay-synchronized optical feedback for pulsed chaos lidar applications. Benefited by the aperiodic uncorrelated waveforms, possesses advantages of no range ambiguity immunity interference jamming. To improve detection while in compliance with eye-safe regulation, generating higher peak power rather than its CW form is desired. While using an acousto-optic modulator time-gate into could be...

This study presents a structural health monitoring method for damage identification and localization of structure, which incorporated with the principal component analysis (PCA) based data compression pattern recognition. Through distribution sensing node in an experimental twin-tower steel structure on shaking table test, dynamic response at different point is collected. Two scenarios are created structure: (1) buckling first story bracing member tower A, (2) 2nd floor A. To extract...

Researchers are constantly leveraging new forms of data with the goal understanding how people perceive built environment and build collective place identity cities. Latest advancements in generative artificial intelligence (AI) models have enabled production realistic representations learned from vast amounts data. In this study, we aim to test potential AI as source textual visual information capturing cities assessed by filtered descriptions images. We asked questions on a set 31 global...

This work reports on the optical feedback dynamics of InAs/GaAs QD lasers epitaxially grown silicon operating in both short and long delay regimes. Both undoped p-doped are considered. Whatever external cavity length, no chaotic oscillations observed samples as a result small α-factor lasers. Despite that, experiments conducted short-cavity region raise period-one oscillation for laser. In addition, transition from to regimes can be finely covered by varying length 5 cm 50 cm, boundaries...

In this study, a paradigm for modulating the light emission performance of photonic-crystal surface-emitting laser (PCSEL) via GaN high electron mobility transistor (HEMT) driving circuit is proposed first time. For detection and ranging (LiDAR) system, faster pulse repetition frequency with shorter width can provide not only resolution but also sufficiently precise range resolution. Hereupon, comprehensive analyses such an integrated system are conducted electro-optical responses...

Silicon-based epitaxial quantum dot (QD) lasers with strong tolerance for back-reflections have paved the way developing isolator-free photonics integrated circuits (PICs). This remarkable feature is attributed to peculiar benefits of QDs, including a large material gain, damping, and small linewidth enhancement factor [1] . The laser performance can also be optimized by applying p-modulation doping in active region In previous study, sensitivity QD on silicon subject short- long-delay...

Random-modulation continuous wave (RMCW) lidar has found applications in robotics, autonomous vehicles, and security, due to its long un-ambiguous range, low mutual interference, the ability resolve multiple targets a single measurement [1], [2]. However, associated time-of-flight (ToF) design is challenging because matched-filter type of demodulation required. Prior works have shown ranging with cm-level resolutions, while most them implemented ToF function discrete components or FPGA,...

Abstract Light detection and ranging (LiDAR) sensor is widely recognized as a critical component for accurate perception. However, there are host of challenges that impede their performance, including low spatial resolution, high costs, large size, reliability, susceptibility to interference. It challenging overcome these issues using single LiDAR module, necessitating the need review current technologies. The paper commences by introducing fundamental principles various laser rangefinders...

Abstract There are different methods to predict survival time, including traditional statistical regression, and modern neural network. Still, precise prediction of time remains as a challenge. In recent years algebraic topology was introduced novel method infer information from high dimensional data set, where mapper uses an algorithm obtain geometric or topological features the associate with predicted variables. this study, set includes gender, age, AFP, GGT, PPT, TB, ALT, tumor size,...

This work presents an integrated circuit design of a time-of-flight module for pulsed chaos lidar systems. With mixed-signal architecture and 1-bit digitization, the proposed evaluates delay in time corresponding distance by calculating cross-correlation function between two signals using 16-unit multiplier-and-integrator array. Tunable filtering further allows resolution dynamic range scaling. The prototype IC with 90-nm CMOS was evaluated in-house system. At 5 GS/s, experiment results...