A5034711210- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Nonlinear Dynamics and Pattern Formation
- Chaos control and synchronization
- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Complex Systems and Time Series Analysis
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Advanced Memory and Neural Computing
- stochastic dynamics and bifurcation
- Plant and animal studies
Southwest University
2018-2020
Pondicherry University
2013-2017
A reservoir computing (RC) system based on a semiconductor laser (SL) with double optical feedback and injection is proposed, the prediction performance of such numerically investigated via Santa Fe Time-Series Prediction task. The simulation results indicate that RC can yield good performance. Through optimizing some relevant operating parameters, ultra-fast information processing rates up to Gb/s level be realized for error below 3%.
<title>Abstract</title> Terahertz-frequency (THz) carrier waves in free-space optical (FSO) communications offer the potential for >1 Tbit/s data rates and stable latency. They wider bandwidths than available microwave region, together with reduced scattering relaxed pointing requirements compared visible near-infrared regions. However, 1-10 THz FSO systems have thus far been limited to several orders of magnitude lower those infrared systems. This work describes first experimental...
We numerically investigate the nonlinear dynamic properties of an exclusive excited-state (ES) emission quantum dot (QD) laser under optical injection. The results show that, suitable injection parameters, ES-QD can exhibit rich dynamical behaviors, such as locking (IL), period one (P1), two (P2), multi-period (MP), and chaotic pulsation (CP). Through mapping these states in parameter space frequency detuning coefficient, it be found that IL occupies a wide region evolution routes appear...
We experimentally demonstrate multi-channel physical random bits (PRBs) generation by utilizing chaotic outputs from two linear polarization modes in a vertical-cavity surface-emitting laser (VCSEL) under optical injection. The polarization-resolved signal is obtained with master-VCSEL subject to feedback, and then injects into slave-VCSEL for driving its state. analyze the influences of injection parameters on bandwidth, complexity, correlation two-channel signals. By using optimized as...
We report an experimental and numerical investigation on the existence of additional delayed-time in chaos synchronization two uni-directionally coupled vertical-cavity surface-emitting lasers (VCSELs) for first time. Under a generalized scenario, we demonstrate that there exists addition to time-of-flight between VCSELs. The cross-correlation function analysis has been used as method determine coupling delay quality chaotic show injection strength significantly influences delayed-time,...
We investigate numerically the anticipated synchronization in two uni-directionally coupled vertical-cavity surface-emitting lasers (VCSELs) as master and slave configuration. The VCSEL is rendered chaotic state by an isotropic optical feedback master's output injected to a under polarization-preserved injection. quality lag time between are obtained performing cross-correlation analysis. When laser's parameters identical, regime of anticipatory found both linearly polarized mode dynamics...
The influence of intra-cavity propagation delay in message encoding and decoding using chaotic semiconductor lasers is numerically investigated. A encoded at the transmitter laser by a chaos shift keying scheme decoded receiver comparing its output with laser. requisite achieving synchronization optical estimated cross-correlation analysis between lasers’ output. effect on recovery has been analyzed from bit error rate performance. It found that despite magnitude being less, it an impact...
Intra-cavity propagation delay is investigated in a system of four chaotic semiconductor lasers coupled cascaded configuration. It found that intra-cavity cumulative nature with an increase the number cascading lasers. Laser injection ratio, frequency detuning, linewidth enhancement factor, and lasers' internal cavity round-trip time are to significantly influence this delay.
A multi-channel wideband chaotic signal generation scheme is proposed and numerically investigated based on a slave multi-transverse mode vertical-cavity surface-emitting laser (SL) subject to optical injection from master (ML) with feedback. Taking two low-order transverse modes, LP01 LP11, as an example for numerical calculations, the simulated results show that under suitable feedback both LP11 modes (two-channel) of ML can be driven into states where their bandwidths are relatively...
We experimentally investigate the nonlinear dynamics of two mutually coupled 1550 nm multi-transverse-mode vertical-cavity surface-emitting lasers (VCSELs). The results show that, through continuously varying coupling coefficient, Y-polarization fundamental transverse mode and first-order in both VCSELs can be driven into period one, doubling, multi-period, chaos states. When are simultaneously operating periodic state, localized synchronizations between corresponding modes observed....
Based on the spin-flip model, state bistability (SB) between pureand mixed-mode states in a 1550-nm vertical-cavity surface-emitting laser under parallel optical injection is theoretically investigated. The simulated results show that two types of SB can be observed when light frequency (v <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">inj</sub> ) smaller than dominant mode free-running (ve). For type-I SB, which occurs through fixing vinj and...
We theoretically investigate power-induced lasing state switching and bistability in a two-state quantum dot laser subject to optical injection. The simulated results show that, for free-running operating at the ground under low current, between excited can be achieved through introducing injection with frequency (w inj ) close of ES ). power required depends on scanning route power, i.e. there may exist within certain region. For forward increase detuning (ΔΩ = w – ), shows decreasing trend...
The role of intra-cavity propagation delay in perfect synchronization between unidirectionally coupled diode lasers is investigated. A regime anticipating arises due to the interplay this and frequency detuning.
An intra-cavity propagation delay effect in synchronization of coupled diode lasers is numerically investigated. A laser (master) with an optical feedback exhibits periodic, intermittent chaos, and chaotic dynamics its output intensity at appropriate rates, the master’s uni-directionally to a solitary (slave). From performance cross-correlation analysis between master slave’s output, we observed that there exists additional called along coupling time lasers. We found this has inverse...