A5073760401- Photonic and Optical Devices
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Advanced Optical Network Technologies
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Advanced Fluorescence Microscopy Techniques
- graph theory and CDMA systems
- Advanced Chemical Sensor Technologies
- Quantum Computing Algorithms and Architecture
- Network Security and Intrusion Detection
- Advanced Biosensing Techniques and Applications
- Photonic Crystal and Fiber Optics
- Water Quality Monitoring and Analysis
- Educational Innovations and Technology
- Nanofabrication and Lithography Techniques
- Superconducting and THz Device Technology
- Smart Cities and Technologies
- Photoreceptor and optogenetics research
- thermodynamics and calorimetric analyses
- Energy Harvesting in Wireless Networks
National Technical University of Athens
2014-2024
Institute of Communication and Computer Systems
2017-2024
Optronics Technologies (Greece)
2018-2024
LioniX (Netherlands)
2021
National and Kapodistrian University of Athens
2009-2020
Athens Information Technology
2007-2008
University of Pavia
2007
Foundation for Research and Technology Hellas
2005-2006
We present an extensive analysis of optical Blass-matrix architecture as a beamforming network with potential for multibeam operation in wireless systems. Its design relies on the use phase shifters and Mach-Zehnder Interferometers (MZIs) inside $M\times N$ matrix, enables generation M beams by N-element antenna arrays. start our from signal amplitude modulation discrete microwave tones, confirm possibility to translate its shifts matrix into equivalent domain. show this is possible when...
To fulfill the functionality demands from fast developing optical networks, a hybrid integration approach allows for combining advantages of various material platforms. We have established polymer-based platform (polyboard), which provides flexible input/ouptut interfaces (I/Os) that allow robust coupling indium phosphide (InP)-based active components, passive insertion thin-film-based elements, and on-chip attachment fibers. This work reviews recent progress our polyboard platform. On...
We demonstrate a broadband and continuously tunable 1×4 optical beamforming network (OBFN), based on the hybrid integration of indium phosphide (InP) components in silicon nitride (Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> ) platform. The photonic integrated circuit (PIC) comprises InP-Si external cavity laser, pair InP phase modulators, Si single-sideband full carrier (SSBFC)...
We demonstrate solid-state optical beam-steering utilizing polymer waveguides as edge emitters to form phased arrays (OPAs) for operation at 1550 nm. Waveguide spacing below the wavelength is hindered in low index contrast OPAs by cross-coupling, leading formation of unwanted grating lobes far field. employ non-uniform between 16 channels suppress and improve unambiguous beam steering range. Three different aperiodic layouts are fabricated experimentally tested. Within a range ±10° we...
We propose and demonstrate a novel O-band wavelength division multiplexing (WDM) optical transceiver enabled by the hybrid photonic integration of indium phosphide (InP) components into polymer-based motherboard called PolyBoard. The engine hosts an eight-fold InP electro-absorption modulated laser (EML) array at transmitter part exhibiting >35GHz electro-optical bandwidth photodiode (PD) receiver with 50 GHz bandwidth, butt-end coupled to PolyBoard motherboard, which accommodates passive...
We demonstrate the first integrated transmitter for serial 100 Gb/s NRZ-OOK modulation in datacom and telecom applications. The relies on use of an electro-optic polymer modulator hybrid integration InP laser diode InP-DHBT electronics with board. Evaluation is made at 80 through eye-diagrams BER measurements using a receiver module that integrates pin-photodiode electrical 1:2 demultiplexer. Error-free performance confirmed both revealing viability approach potential technology.
We propose a novel concept for the implementation of 2-dimensional (2D) optical phased arrays (OPAs) with end-fire waveguides as antenna elements (AEs), and we present its theoretical model experimental proof. The is based on use 3-dimensional (3D) photonic integrated circuits (PICs) multiple waveguiding layers PolyBoard platform. In their simplest form, 3D PICs comprise AEs at different layers, vertical lateral couplers distribution light among AEs, phase shifters execution 2D beam scanning...
We extend our previous simulation study and we present experimental results regarding Fast Fourier Transform method for the calculation of resonance shifts in biosensors based on micro-ring resonators (MRRs). For study, use a system model with tunable laser at 850 nm, an MRR 1.5∙104 quality factor, detection 50 dB maximum signal-to-noise ratio, investigate impact performance factors like number peaks inside scanning window, wavelength dependence power, asymmetry transfer functions MRRs. find...
We demonstrate a 2 × 100 Gb/s transmitter and 4 receiver as the key components for multi-100-GbE 400-GbE optical interfaces in future intradata center networks. Compared to other approaches, two devices can provide significant advantages terms of number components, simplicity, footprint, cost, they are capable serial operation with nonreturn-to-zero on-off keying format directly at Gb/s. The is based on monolithic integration multimode interference coupler Mach-Zehnder modulators an...
It is still a common belief that ultra-high quality-factors (Q-factors) are prerequisite in optical resonant cavities for high refractive index resolution and low detection limit biosensing applications. In combination with the ultra-short steps necessary when measurement of resonance shift relies on wavelength scanning laser source conventional methods data processing, Q-factor requirement makes these biosensors extremely impractical. this work we analyze an alternative processing method...
We propose an optical beamforming network (OBFN) for multi-beam operation and continuous selection of the beam angles. The OBFN is based on use wavelength-division multiplexing elements generation manipulation signals that correspond to different beams antenna (AEs), delay lines introduction tunable time delays these signals. analyze operating principle proposed in downlink uplink directions a wireless system, we experimentally demonstrate its proof concept direction up photodetection stage,...
Optoelectronic technology is expected to be the cornerstone of sub-THz communication systems, enabling access and use vast frequency resources found in this portion spectrum. In work we demonstrate a photonics-enabled wireless link operating real-time settings, using PIN-PD-based THz emitter, receiver based on an ultra-fast photoconductor. The generation detection information signal performed by intermediate (IF) unit commercially available mmWave platform, at 1.6 GBaud. evaluation our setup...
We report on the simultaneous 2R regeneration of up to three 42.7-Gb/s wavelength-division-multiplexing channels in a simple dispersion-managed fiber section with signal quality improvements higher than 1.7 dB. The regenerator relies self-phase modulation-induced spectral broadening optical inside and subsequent bandpass filtering at shifted wavelengths, it is experimentally investigated single-, dual-, three-channel operation using pulses 33% duty cycle.
A generic scheme for return-to-zero (RZ) to nonreturn-to-zero (NRZ) format conversion of optical signals is analyzed. It relies on a simple delay interferometer with frequency periodicity twice as high the input symbol rate and subsequent band-pass filter. Simulation results at 40 Gbaud indicate compatibility technique variety advanced modulation formats. RZ-to-NRZ Gb/s differential phase shift keying experimentally demonstrated 1.5 dB power penalty compared back-to-back measurement.
The transformation of cities into smart is a crucial issue for improving the citizens' living conditions. One major goals city concept to modernize urban management utilizing state art technologies. A remarkable proliferation compute-intensive security and safety applications has been disclosed recent years in cities. Such generate enormous amounts data demanding strict latency-aware computational processing capabilities. Recent technologies such edge computing viable solution address...
Single photon counting detectors are extremely important in the evolution of quantum technologies. The existing devices for low-flux measurements bulky and their implementation cannot be made with small footprints. Integrated photonics aims to allow miniaturization these setups. We present simulation results design a single 1x10 multimode interference coupler (MMI) terms power imbalance between output waveguides, optical losses, tolerance on operating wavelength. This component acts as...
Second-harmonic generation (SHG) and two-photon excitation fluorescence (TPEF) are relatively new promising tools for the detailed imaging of biological samples processes at microscopic level. By exploiting these nonlinear phenomena phototoxicity photobleaching effects on specimens reduced dramatically. The main target this work was development a compact inexpensive reliable experimental apparatus microscopy measurements. Femtosecond laser pulses were utilized excitation. We achieved...
We experimentally investigate a dispersion-managed four-channel 2R regenerator that relies on self-phase modulation-induced spectral broadening and offset filtering at four shifted wavelengths. The device consists of several alternating sections dispersion-compensating fibers single-mode fibers. Due to this arrangement the use low duty-cycle return-to-zero pulses, nonlinear interchannel effects are sufficiently mitigated resulting in almost no additional degradation compared single-channel case.
In this paper, we present the development of a photonic biosensor device for cancer treatment monitoring as complementary diagnostics tool. The proposed combines multidisciplinary concepts from photonic, nano-biochemical, micro-fluidic and reader/packaging platforms aiming to overcome limitations related detection reliability, sensitivity, specificity, compactness cost issues. sensor is based on an array six asymmetric Mach Zender Interferometer (aMZI) waveguides silicon nitride substrates...
We present a real-world Gigabit Passive Optical Network (GPON)-based Fiber to the Home (FTTH) network serving up 32 users, installed in COSMOTE laboratories Athens. The deployment relies on use of fiber optics and GPON telecom equipment which are identical those found currently deployed FTTH infrastructure. describe real-life designs that correspond specific installations considered Athens urban metropolitan area. propose practical upstream Quantum Access (QAN) over network, relied...
We analyze the experimental demonstration of a phase-incoherent regeneration scheme for differential phase-shift keying signals at 40 Gb/s. The is based on decoding input signal by 1-bit delay interferometer and subsequent optical remodulation using fiber-Sagnac interferometer. Power penalty improvement up to 3 dB reported phase, amplitude, amplified spontaneous emission noise loaded signals. Simulation results are in agreement with findings, reveal capability extending method ultrahigh data rates.
Benes/Clos networks constitute a particularly important part of interconnection and have been used in numerous areas, such as multi-processor systems, data centers on-chip networks. They also attracted great interest the field optical communications due to increasing popularity switches based on these architectures. There are algorithms aimed at routing types networks, with varying degrees utility. Linear algorithms, Sun Tsu Opferman, were historically first attempt standardize procedure...