Panagiotis Kourelias

Inter-Campus Converged Fiber/Free-Space C-Band QKD Link During Daylight

Panagiotis Kourelias, Argiris Ntanos, Aristeidis Stathis, Nikolaos Makris et autres

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Field-Deployed 800 $(2 \times 400$) Gbps Bidirectional Fiber-Wireless-Fiber QKD-Encrypted OTNsec Transmission

Nikolaos Makris, Panagiotis Kourelias, Persefoni Konteli, Evrydiki Kyriazi et autres

We demonstrate an 800 Gbps data stream QKDenabled Layer-1 encryption over a deployed bidirectional Fiber-Wireless-Fiber (FWF) link including 70 m of free-space optical (FSO) propagation.

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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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Field Demonstration of an SDN-enabled 0.48 Tb/s Hybrid Coherent/IM-DD 0.75 km FSO/Fiber System

Evrydiki Kyriazi, Panagiotis Toumasis, Argiris Ntanos, Aristeidis Stathis et autres

We experimentally demonstrate a hybrid coherent/IM-DD system enabling real-time reconfiguration of format, baud rate, wavelength, and path between fiber and 0.75 km FSO links, achieving 0.48 Tb/s, error-free operation, and sub-millisecond switching for resilient next-generation optical access networks. tel:+302107722871, email: evkyriazi@mail.ntua.gr ).

Integration of C-band Polarization-Encoded QKD over Deployed 5G X-Haul infrastructure

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

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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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Wavelength Trade-offs in Satellite-to-Ground QKD: A System-Level Comparison of 810 nm and 1550 nm Bands

Argiris Ntanos, Aristeidis Stathis, Panagiotis Kourelias, Athanasios D. Panagopoulos et autres

Wavelength choice critically impacts satellite-to-ground Quantum Key Distribution (QKD) performance and system design. This work compares the Si-band and C-band for QKD downlinks using system-level modeling and cost–performance analysis. The results quantify trade-offs in efficiency and complexity, providing guidance for wavelength selection …

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Field Trial of a Record-High Data Rate SDN-Controlled Fiwi FSO/Mmwave X-Haul With Zero-Touch Handover for 6G

Maria Vargemidou, Christos Vagionas, Argyris Kokkinis, Argiris Ntanos et autres

An SDN-orchestrated Fiber-Wireless FSO/mmWave X-haul with$100 ~\text{Gb} / \mathrm{s}$real-time, lowlatency service-provisioning and 24hour-long weather-resilient daylight/night-time operation relying on automated zero-touch handovers is experimentally presented, achieving an order of magnitude speed enhancement in real-time hybrid 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 100 m FSO validate its feasibility for integration of satellite QKD with …

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Field Trial of $3\mathrm{x}1$ Distributed Fiber Wireless mmWave Xhaul with Coordinated Multi-Point Scheduling and Real-Time MEC

Argyris Kokkinis, Maria Vargemidou, Christos Vagionas, Argiris Ntanos et autres

The first outdoor field-trials of 3×1-distributed fiber-wireless mmWave antenna-system are experimentally presented, delivering uninterrupted real-time MEG-services at 2Gb/s user-rate and 0.195ms latency over an SDN-controlled coordinated multipoint X-haul with 7km fiber and 30m radio-distance. © 2025 The Author(s).

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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 …