A5059954786- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Semiconductor Quantum Structures and Devices
- Advanced Fiber Laser Technologies
- Substance Abuse Treatment and Outcomes
- Adolescent Sexual and Reproductive Health
- Photonic Crystal and Fiber Optics
- Semiconductor materials and devices
- Thermoregulation and physiological responses
- Online and Blended Learning
- Aging and Gerontology Research
- Optical Wireless Communication Technologies
- Sentiment Analysis and Opinion Mining
- Blind Source Separation Techniques
- Online Learning and Analytics
- Cannabis and Cannabinoid Research
- Network Traffic and Congestion Control
- Misinformation and Its Impacts
- Software-Defined Networks and 5G
- Emotion and Mood Recognition
- Sleep and Wakefulness Research
- Obstructive Sleep Apnea Research
National Technical University of Athens
2014-2024
University of Patras
2013-2022
Athens Information Technology
2007-2017
Trinity College Dublin
2016
National and Kapodistrian University of Athens
2011
Aristotle University of Thessaloniki
2008-2011
University Mental Health Research Institute
2006-2010
We propose a novel co-packaged optical transceiver architecture capable of operating at 112 Gbaud per lane and scalable to 1.6 Tb/s capacity beyond for next generation 51.2T 102.4T digital switches.
We present analytic expressions for the frequency-domain transfer function of semiconductor optical amplifier Mach-Zehnder interferometric (SOA-MZI) switches that employ a single control signal and continuous wave input beam. Our analysis relies on first-order perturbation theory approximations applied both to SOA response as well SOA-MZI characteristics, yielding frequency enables qualitative insight into different operational regimes. The final expression is utilized evaluation...
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...
We introduce a hybrid integration platform based on the combination of passive and electro-optic polymers. analyze optical physical compatibility these materials describe advantages that our is expected to have for development transmitters in terms operation flexibility speed. combine with InP electronics develop transmitter 22-nm tunability C-band potential serial non-return-to-zero on-off-keying directly at 100 Gb/s. investigate its transmission performance 80 Gb/s using dispersion...
We propose a novel approach to mitigate the limitations of high-speed Passive Optical Networks (PONs) by introducing an all-optical processor. This solution addresses escalating demand for higher data rates and improved performance in future access networks. The processor leverages optical signal processing enhance system efficiency reduce power consumption compared traditional electrical methods. Specifically, we explore processor’s dual functionality performing equalization chromatic...
Field experiments of 42.7/128.1 Gb/s wavelength-division multiplexed, optical time-division multiplexed (WDM-OTDM) transmultiplexing and all-optical dual-wavelength regeneration at the OTDM rate are presented in this paper. By using asynchronous retiming scheme, we achieve error-free bufferless data grooming with time-slot interchange capability for meshed networking. We demonstrate excellent performance from system, discuss scalability, applicability, potential reach scheme transparent...
Aims: To assesses the extent of gender gap among treated population drug users across Europe.Methods: This analysis reports data on 363,170 clients from 4647 treatment units in 23 countries (22 European Union member states and Switzerland).Findings: Overall, males outnumber females by four, but ratio varies not only geographical region/country, also drug. In majority countries, most common primary problem is opioids, overall mirrors opioid users. some a considerable proportion have cannabis...
We report on the complete experimental evaluation of a GaInNAs/GaAs (dilute nitride) semiconductor optical amplifier that operates at 1.3 μm and exhibits 28 dB gain recovery time 100 ps. Successful wavelength conversion operation is demonstrated using pseudorandom bit sequence 27-1 non-return-to-zero streams 5 10 Gb/s, yielding error-free performance showing feasibility for implementation in various signal processing functionalities. The operational credentials device are analyzed regimes,...
Modern IoT and 5G applications are driving the growth of Internet traffic impose stringent requirements to datacenter operators for keeping pace with increasing bandwidth low-latency demands. At same time, datacenters suffer from number interconnections dictating deployment novel architectures high-radix switches. The ratification 400 GbE standard is market optical transceivers nevertheless, a technology upgrade will be soon necessary meet tremendous growth. In this paper, we present...
Background-Aim. Although sleep disturbance is a common complaint among patients of all ages, research suggests that older adults are particularly vulnerable. The aim this retrospective study was to elucidate the influence age on clinical characteristics and polysomnographic findings obstructive apnea syndrome (OSAS) between elderly younger male in Greek population. Methods. 697 with OSAS were examined from December 2001 August 2011. All subjects underwent an attended overnight...
We propose a novel multi-flow transmitter concept capable of controlling the number, type, wavelength, and destination generated optical flows depending on client traffic. The is based selection number carriers per flow between single- dual-polarization flows. demonstrate proof-of-concept combining two commercial In-Phase/Quadrature (IQ) modulators with prototype polymer circuits, which integrate three tunable lasers for flexible wavelength allocation, four thermo-optic switches routing...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text G. Zarris, F. Parmigiani, E. Hugues-Salas, R. Weerasuriya, D. Hillerkuss, N. A. Gonzalez, M. Spyropoulou, P. Vorreau, Morais, S. K. Ibrahim, Klonidis, Petropoulos, Ellis, Monteiro, Tzanakaki, Richardson, I. Tomkos, Bonk, W. Freude, J. Leuthold, and Simeonidou, "Field Trial of WDM-OTDM Transmultiplexing employing Photonic Switch Fabric-based Buffer-less Bit-interleaved...
We present a novel scheme for high-speed multiwavelength clock recovery using low finesse Fabry-Perot filter and quantum-dot semiconductor optical amplifier. Performance evaluation based on extensive numerical analysis reveals that the proposed configuration can acquire from 40- 160-Gb/s input data packet streams at four wavelengths with very short rise- fall-times.
In this letter, we examine the performance of a multiwavelength 2R regenerator based on cross-gain modulation effect in quantum-dot semiconductor optical amplifiers. Extensive numerical simulations have been performed to investigate device parameters and operating conditions proposed subsystem. All-optical regeneration two input channels at 40 160 Gb/s are illustrated.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text D. Apostolopoulos, H. Simos, Petrantonakis, A. Bogris, M. Spyropoulou, Bougioukos, K. Vyrsokinos, N. Pleros, Syvridis, and Avramopoulos, "A New Scheme for Regenerative 40 Gb/s NRZ Wavelength Conversion using a Hybrid Integrated SOA-MZI," in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optica Publishing Group, 2010), paper OThS6. Export BibTex...
The ever-increasing demands in traffic fueled by bandwidth hungry applications are pushing data centers to their limits challenging the capacity and scalability of currently established transceiver switching technologies center interconnection (DCI) networks. Coherent optics emerged as a promising solution for inter-DCIs offering unprecedented capacities closer relaxing power budget restrictions link. QAMeleon, an EU funded R D project, is developing new generation faster greener sliceable...
We demonstrate a large-scale silica-on-silicon photonic integrated circuit with 4 hybridly SOAs for multi-format regeneration and wavelength conversion. Power penalty improvement up to 1.5dB is reported degraded OOK PSK signals.
We propose a novel co-packaged optical transceiver architecture capable of operating at 112 Gbaud per lane and scalable to 1.6 Tb/s capacity beyond for next generation 51.2T 102.4T digital switches.
In this paper, we present an "Asymmetric Passive Optical Network for xDSL and FTTH Access" (PANDA) architecture that is suitable providing end-users with broadband connections in a cost-effective non-disruptive fashion. We first describe the need expanding current ADSL access to VDSL (and ultimately FTTH), as well network upgrades will be required perform expansion. then introduce PANDA architecture, multiwavelength passive optical (PON) implements fiber-to-the cabinet (FTTC) scheme provides...
As new technologies emerge, more and people depend on them for a variety of purposes. Now than ever there is tendency technological implications to substitute face-to-face communication education. In this paper we attempt investigate whether the usability pedagogical factors quality educational platforms meet expectations three dominant learning theories past century, which, namely are: behaviorism, cognitivism constructivism. We assign specific derived from 9 evaluation models 3 theories. A...
The feasibility of transmitting 0.87 Tbit/s dual polarization D8PSK-OTDM over 110 km is, for the first time, demonstrated along with 0.44 single 220 in conventional 55-km span SMF+DCF link.
We investigate through numerical studies and experiments the performance of a large scale, silica-on-silicon photonic integrated circuit for multi-format regeneration wavelength-conversion. The encompasses monolithically array four SOAs inside two parallel Mach-Zehnder structures, delay interferometers number silica waveguides couplers. Exploiting phase-incoherent techniques, is capable processing OOK signals at variable bit rates, DPSK 22 or 44 Gb/s DQPSK Gbaud. Simulation reveal...
For the first time to our knowledge we perform a study related with multi-wavelength 2R regeneration based on cross-gain modulation (XGM) operation at 40 Gbps using quantum-dot semiconductor optical amplifiers (QD-SOAs).
Abstract The transformation of datacentres to support the increasing traffic growth requires development new technologies migrate 1.6T optical transceivers and ultra-fast high radix space switches. In this work, an outline technological perspectives TWILIGHT project is provided in accordance with research updates industry standards.