Nikolaos K. Lyras

Practical approach to last-mile converged free-space and fiber QKD for secure city-scale networks

Aristeidis Stathis, Argiris Ntanos, Panagiotis Kourelias, Evridiki Kyriazi et autres

Current Free-Space Optical Quantum Key Distribution (FSO-QKD) systems are mainly focusing on the development of critical components needed towards the realization of satellite-based QKD, relying on bulky optical telescopes equipped with expensive optical systems. The cost and complexity of these systems hinder …

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Experimental Demonstration of OAF Fiber-FSO Relaying for 60 GBd Transmission in Urban Environment

Evrydiki Kyriazi, Panagiotis N. Toumasis, Panagiotis Kourelias, Argiris Ntanos et autres

We present an experimental demonstration of a daylight-capable Optical Amplify-and-Forward (OAF) relaying system designed to support flexible and high-capacity network topologies. The proposed architecture integrates fiber-based infrastructure with OAF Free Space Optics (FSO) relaying, enabling bidirectional optical communication over 460 m (x2) …

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SMF-Coupled Compact Ground Terminal with Advanced Filtering Towards Daylight C-Band Satellite QKD

Argiris Ntanos, Aristeidis Stathis, Panagiotis Kourelias, Evridiki Kyriazi et autres

We demonstrate a compact, high-isolation C-band optical ground terminal for satellite-QKD, achieving more than 120 dB daylight background suppression and 135 dB crosstalk noise isolation. Successful QKD over an outdoor 100 m FSO validate its feasibility for integration of satellite QKD with …

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Hybrid FSO/mmWave Industry 5.0 System Enabled by Ultra-Fast Tunable PZT-Based External Cavity Laser

Evrydiki Kyriazi, Ilka Visscher, Panagiotis N. Toumasis, Giorgos Megas et autres

We demonstrate a hybrid FSO/mmWave system tailored, but not limited to Industry 5.0 applications, enabled by a sub-μs tunable PZT-based laser. Experimental results confirm reliable modulation over 5 km fiber and 5 m wireless links, highlighting potential for scalable, low-latency hybrid communication …

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Field Trial of Polarization-Encoded QKD Over 5G Backhaul and Fronthaul Fiber Links

Aristeidis Stathis, Argiris Ntanos, Panagiotis Kourelias, Panagiotis N. Toumasis et autres

This work demonstrates successful QKD/5G service coexistence over deployed X-Haul infrastructure, sharing$10 ~\text{Gb} / \mathrm{s}$classical data and raw click rates of 4.3 kbps and 51.9 kbps over 22.6 km backhaul and 2.2 km fronthaul fiber links. ©2025 The Author(s)

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SMF Coupled Compact Ground Terminal with Advanced Filtering Towards Daylight C Band Satellite QKD

Argiris Ntanos, Aristeidis Stathis, Panagiotis Kourelias, Evridiki Kyriazi et autres

We demonstrate a compact, high-isolation C-band optical ground terminal for satellite QKD, achieving more than 120 dB daylight background suppression and 135 dB crosstalk noise isolation. Successful QKD over an outdoor 100m FSO validate its feasibility for integration of satellite-QKD with urban …

Feasibility analysis of optical satellite communication systems in Cyprus: CFLOS and irradiance statistics

Nikolaos K. Lyras, Konstantinos Katzis, Christiana Panayi, Orestis Pavlou et autres

Optical satellite communications offer unique advantages compared to Radio-frequency (RF) satellite systems such as greater bandwidth, higher data rates, reduced power consumption, etc. Potential applications for such links may include high-speed optical communication links, intersatellite links, relay links for geosynchronous satellites as …

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5G X-haul/QKD Multiplexing over Deployed Infrastructure

Aristeidis Stathis, Argiris Ntanos, Panagiotis Kourelias, Panagiotis N. Toumasis et autres

With the rise of 5G X-haul networks and emerging infrastructure segments, efficient multiplexing is essential for enabling secure quantum communication alongside classical data. In this work, we present a polarization-encoded Quantum Key Distribution (QKD) system deployed within the C-band over a live …

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Hybrid Photonic Integrated Circuits for Wireless Transceivers

Tianwen Qian, Benjamin Schuler, Y Durvasa Gupta, Milan Deumer et autres

Recent advancements in hybrid photonic integrated circuits (PICs) for wireless communications are reviewed, with a focus on innovations developed at Fraunhofer HHI. This work leverages hybrid integration technology, which combines indium phosphide (InP) active elements, silicon nitride (Si3N4) low-loss waveguides, and high-efficient …

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High power wavelength tunable external cavity laser for optical transmission

Ilka Visscher, Arjan Meijerink, Roel Botter, M. Zafar et autres

We report a novel hybrid integrated photonic wavelength-tunable laser for transmitter applications. The device combines two photonic integrated circuit (PIC) technologies, Indium Phosphide (InP) and TriPleX® silicon nitride (Si3N4), to realize a high-power laser. The laser comprises one semiconductor optical amplifier (SOA), …

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Hybrid Photonic Integrated Circuits for Wireless Transceivers

Tianwen Qian, Benjamin Schuler, Y Durvasa Gupta, Milan Deumer et autres

Recently developed photonic integrated circuits (PICs) for wireless communications are reviewed. These PICs leverage hybrid integration technology, which combines InP active elements, silicon nitride (Si3N4) low-loss waveguides, high-efficient ther-mal-optical tunable polymer with micro-optical functions to achieve fully integrated systems. This approach incorporates …

Practical Free-Space QKD under Night- and Day-time over a 0.5 km Metropolitan Link

Argiris Ntanos, Aristeidis Stathis, Panagiotis Kourelias, Evridiki Kyriazi et autres

A practical Free-Space polarization-encoded QKD system with Low-Cost Optical Terminals is presented, operating over a 0.5 km urban link, achieving <6% QBER and SKRs up to 1.3 kbps in nighttime and daytime conditions.

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