A5085441021- Optical Network Technologies
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Advanced Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Radiomics and Machine Learning in Medical Imaging
- Plasmonic and Surface Plasmon Research
- Medical Imaging Techniques and Applications
- Planetary Science and Exploration
- Lung Cancer Diagnosis and Treatment
- Optical Wireless Communication Technologies
- Soil Mechanics and Vehicle Dynamics
- Cardiac Imaging and Diagnostics
- Advanced Fiber Laser Technologies
- Astro and Planetary Science
- Advanced Fiber Optic Sensors
- Neural Networks and Reservoir Computing
- Radiopharmaceutical Chemistry and Applications
- Medical Imaging and Pathology Studies
- Modular Robots and Swarm Intelligence
- Robotic Path Planning Algorithms
- Microwave Engineering and Waveguides
- Artificial Intelligence in Healthcare and Education
- Millimeter-Wave Propagation and Modeling
- Advanced X-ray and CT Imaging
National Technical University of Athens
2016-2025
General University Hospital of Patras
1998-2024
University of Patras
2012-2023
EduInnovation
2006-2022
Carnegie Mellon University
1996-2021
Institute of Communication and Computer Systems
2014-2021
Robotics Research (United States)
2021
University of Piraeus
2013-2014
National and Kapodistrian University of Athens
2006-2012
German Cancer Research Center
2011
We experimentally demonstrate a multiband intermediate frequency-over-fiber/mmWave (IFoF/mmWave) fiber/wireless mobile fronthaul link for gigabit capacity over the unlicensed V-band (57–64 GHz). Digital synthesis of radio waveforms is performed at baseband unit using digital subcarrier multiplexing technique, whereas predistortion exploited to cope with analog IFoF channel impairments without any further processing digital-free remote head. Commercial optoelectronic components and antenna...
The current work presents the first experimental demonstration of real-time Ethernet (ETH) trial services and 4K-Ultra High Definition (UHD) video application transmission over a 2λ Wavelength Division Multiplexing (WDM) analog Fiber-Wireless (FiWi) mmWave X-haul network, supporting dynamic flexible capacity allocation through an integrated silicon photonic Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N...
We demonstrate an optical static random access memory cell that provides read and write functionality at 5 Gb/s. The circuit comprises a hybridly integrated semiconductor amplifier-Mach-Zehnder interferometer (SOA-MZI) flip-flop serving as the unit two additional SOA-based cross-gain modulation switches for controlling to cell.
Abstract With metal stripes being intrinsic components of plasmonic waveguides, plasmonics provides a “naturally” energy-efficient platform for merging broadband optical links with intelligent electronic processing, instigating great promise low-power and small-footprint active functional circuitry. The first Dielectric-Loaded Surface Plasmon Polariton (DLSPP) thermo-optic (TO) switches successful performance in single-channel 10 Gb/s data traffic environments have led the inroad towards...
Background: This study targets the development of an explainable deep learning methodology for automatic classification coronary artery disease, utilizing SPECT MPI images. Deep is currently judged as non-transparent due to model’s complex non-linear structure, and thus, it considered a «black box», making hard gain comprehensive understanding its internal processes explain behavior. Existing artificial intelligence tools can provide insights into functionality especially convolutional...
Abstract Surface plasmon propagating modes supported by metal/dielectric interfaces in various configurations can be used for radiation guiding similarly to conventional dielectric waveguides. Plasmonic waveguides offer two attractive features: subdiffraction mode confinement and the presence of conducting elements at mode‐field maximum. The first feature exploited realize ultrahigh density nanophotonics components, whereas second enables development dynamic components controlling...
Light detection and ranging (Lidar) is a key enabling technology for autonomous vehicles drones. Its emerging implementations are based on photonic integrated circuits (PICs) optical phased arrays (OPAs). In this work, we introduce novel approach to the design of OPA Lidar antennas Si3N4 grating couplers. The well-established TriPleX platform asymmetric double stripe waveguide geometry with full etching employed, ensuring low complexity simple fabrication combined low-loss advantages...
Objective To investigate a deep learning technique, more specifically state-of-the-art convolutional neural networks (CNN), for automatic characterization of polar maps derived from myocardial perfusion imaging (MPI) studies the diagnosis coronary artery disease. Subjects and methods Stress rest corresponding to 216 patient cases database department Nuclear Medicine our institution were analyzed. Both attenuation-corrected (AC) non-corrected (NAC) images included. All patients subjected...
We present theoretical and experimental performance analysis of 40 Gb/s Non-Return-to-Zero (NRZ) All-Optical Wavelength Conversion (AOWC) using a differentially-biased SOA-MZI. A frequency domain transfer function model for both the standard single-control SOA-MZI-based AOWC SOA-MZI is analytically derived, exploiting first order perturbation theory techniques showing that only scheme can yield an almost flat low-pass filtering response enabling wavelength conversion at Gb/s. The...
A comprehensive theoretical analysis of end-fire coupling between dielectric-loaded surface plasmon polariton and rib/wire silicon-on-insulator (SOI) waveguides is presented. Simulations are based on the 3-D vector finite element method. The geometrical parameters interface varied in order to identify ones leading optimum performance, i.e., maximum efficiency. Fabrication tolerances about parameter values also assessed. In addition, effect a longitudinal metallic stripe gap efficiency...
We present a fixed mobile convergence topology for analog intermediate frequency over fiber (A-IFoF)/millimeter-wave (mmWave) transmission, benefiting from the reuse of deployed passive optical network (PON) infrastructure, towards future fronthaul architectures. Powerful fully programmable gate array boards located inside access nodes convert Ethernet-based traffic to orthogonal frequency-division multiplexing (OFDM)-modulated (IF) waveforms, supporting A-IFoF propagation through legacy...
While significant recent progress has been made in development of mobile robots for planetary surface exploration, there remain major challenges. These include increased autonomy operation, traverse challenging terrain, and fault-tolerance under long, unattended periods use. We have begun work which addresses some these issues, with an initial focus on problems high risk access, that is, autonomous roving over highly variable, rough terrain. This is a dual problem sensing those conditions...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper presents an experimental performance characterization of all-optical subsystems at 40 Gb/s using interconnected hybrid integrated semiconductor optical amplifier (SOA) Mach–Zehnder interferometer (MZI) gates and flip-flop prototypes. It was shown that can be treated as generic switching elements and, when efficiently interconnected, form larger more functional network subsystems....
We demonstrate Wavelength Division Multiplexed (WDM)-enabled transmission of 480Gb/s aggregate data traffic (12x40Gb/s) as well high-quality 1x2 thermo-optic tuning in Dielectric-Loaded Surface Plasmon Polariton Waveguides (DLSPPWs). The WDM characteristics have been verified through BER measurements by exploiting the heterointegration a 60 μm-long straight DLSPPW on Silicon-on-Insulator waveguide platform, showing error-free performance for six out twelve channels. High-quality has achieved...
The authors demonstrate a novel all-optical T-flip-flop (TFF) layout utilizing single optical latching element that comprises an integrated semiconductor amplifier and Mach-Zehnder inteferometer feedback loop. Experimental proof-of-concept verification is presented at 8 Mb/s using off-the-shelf bulk components fiber-based implementation. proposed TFF architecture requires the minimum number of active just toggling signal as input. Its simple circuit design amenable with photonic integration...