A5076704771- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Advanced Fiber Optic Sensors
- Optical Coatings and Gratings
- Semiconductor Quantum Structures and Devices
- Nonlinear Dynamics and Pattern Formation
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Advanced Fiber Laser Technologies
- Advanced MEMS and NEMS Technologies
- Network Security and Intrusion Detection
- Quantum Computing Algorithms and Architecture
- Quantum Information and Cryptography
- Advanced Malware Detection Techniques
- Cryptography and Data Security
- Chaos-based Image/Signal Encryption
- IoT-based Smart Home Systems
- Quantum optics and atomic interactions
- Electric and Hybrid Vehicle Technologies
- Laser Design and Applications
- Internet Traffic Analysis and Secure E-voting
- Sensor Technology and Measurement Systems
- Sensorless Control of Electric Motors
- Quantum many-body systems
Birmingham City University
2023-2024
Eindhoven University of Technology
2004-2012
Netherlands Organisation for Applied Scientific Research
2011
Japan External Trade Organization
2010-2011
Vrije Universiteit Amsterdam
1999-2004
Vrije Universiteit Brussel
2004
University of Amsterdam
2003
We report on a theoretical analysis of the dynamical performance semiconductor laser under influence delayed weak filtered external optical feedback. The filter widths considered range from 1 to 100 GHz. concentrates well known low-frequency fluctuations (LFFs) regime, in which LFFs occur absence filtering. As expected, filtering feedback light stabilizes system general. LFF can already be suppressed for moderately broad filters (25-50 GHz). In that case, was found operate maximum gain mode...
This research aims to establish a secure system for key exchange by using post-quantum cryptography (PQC) schemes in the classic channel of quantum distribution (QKD). Modern faces significant threats from computers, which can solve classical problems rapidly. PQC address critical security challenges QKD, particularly authentication and encryption, ensure reliable communication across channels. The other objective this study is balance speed among various algorithms different levels,...
In the original publication [...]
We report on the systematical investigation of steady-state regime and dynamical behavior a semiconductor laser subject to delayed filtered optical feedback. study Fabry-Perot (FP) interferometer type filter placed in external feedback loop diode laser. The effects locking frequency cavity modes are described. observe hysteresis, bistability, multistability show that all these well described by set rate equations for coupled FP system. also present an experimental stability diagram summarizes
Abstract The rapid increase and adoption of Internet Things (IoT) devices have introduced unprecedented conveniences into modern life. However, this growth has also ushered in a wave cyberattacks targeting these often‐vulnerable systems. Smart cities, relying on interconnected sensors, are particularly susceptible to attacks due the expanded entry points created by devices. A security breach such systems can compromise personal data disrupt entire ecosystems. Traditional measures inadequate...
We report experimental results on the nonlinear dynamical response of a semiconductor laser subjected to time-delayed (>5 ns), frequency selective, optical feedback from Fabry-Pe/spl acute/rot interferometer type filter. Three regimes interest, based relative value filter bandwidth with respect relevant parameters (relaxation oscillation and external cavity mode spacing), are identified, viz. wide case, an intermediate width narrow case. The is shown be quite different in each these regimes....
Penetration testers have increasingly adopted multiple penetration testing scanners to ensure the robustness of web applications. However, a notable limitation many scanning techniques is their susceptibility producing false positives. This paper presents novel framework designed automate operation Web Application Vulnerability Scanners (WAVS) within single platform. The generates combined vulnerabilities report using two algorithms: an automation algorithm and combination that produces...
A novel multilongitudinal-mode rate-equations description of the semiconductor laser is presented. The model includes gain interactions among longitudinal modes due to e.g., spatial hole burning. parameters have been obtained from a real device, in order be able compare with simulations. results are good qualitative agreement measurements.
We present theory and measurements on a vertical-cavity surface-emitting laser (VCSEL) biased close to its solitary threshold subject polarization selective external optical feedback. The system shows low-frequency fluctuations (LFF) in the selected mode (PM). Below threshold, orthogonal PM remains silent, while it only responds after dropout event main above threshold. Our calculations show good agreement with identify type of synchronization between dynamics two PMs.
We find that, although inversion noise has only a marginal effect on the linewidth of semiconductor laser in continuous wave operation, presence dynamics, it may play an important role determining final dynamical state. It is, therefore, essential to include realistic carrier when analysing dynamics.
We present an accurate and fast 3-D simulation scheme for out-of-plane grating couplers, based on 2-D rigorous [finite difference time domain (FDTD)] simulations, the effective index method, Rayleigh-Sommerfeld diffraction formula. In comparison with full FDTD rms in electric field is below 5% power flux 3%. A coupler coupling from a silicon-on-insulator photonic integrated circuit to optical fiber positioned 0.1 mm above designed as example.
We report on a pressure sensor consisting of Photonic Integrated Circuit (PIC) in Silicon-On-Insulator (SOI) technology. The fabrication process is CMOS-compatible, the spirit 'More than Moore' concept. device size 1×1 mm including fibre coupling interfaces. Applications this type sensors are wide-spread. Our main interest medical applications, where SOI-based can accommodate need for high sensitivity and small size.
In this paper, we present two examples of photonic sensors based on ring resonators in Silicon-on-Insulator (SOI) waveguide technology as mass production compatible sensing units for the measurement of: strain, and ultrasound. Furthermore, are characterized extreme conditions to validate their robustness harsh industrial environments. addition, monitoring these is presented an application on-chip 3×3 interferometer.
We are the first to present experimental results and understanding of effects an applied strain S in effective index n <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</sub> a SOI-PIC. fabricated set long racetrack-shaped ring resonators (length 1040 μm, bend radius 25 circumference l), oriented along [110] crystalline direction, consisting waveguide with dimensions 1000 x 300 nm. Having racetrack enables us neglect bends. excite fundamental TM...
Summary form only given. Strain gauges are widely employed in microelectromechanical systems (MEMS) for sensing of, example, deformation, acceleration, pressure, or sound [1]. Such typically based on electronic piezoresistivity. We propose integrated optical sensors which have particular benefits: insensitivity to electromagnetic interference, no danger of igniting gas explosions with electric sparks, small multiplexers (1 mm<;sup>2<;/sup>) and high-speed readout. use photonic microring...