Ronis T. Maximidis

Scalable Optical MIMO processor using Silicon Photonics

Stefanos Kovaios, Christos Vagionas, Maria Vargemidou, Ronis T. Maximidis et autres

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A Crossbar-based coherent silicon photonic MIMO processor for wireless communications

Stefanos Kovaios, Maria Vargemidou, Christos Vagionas, Ronis T. Maximidis et autres

We demonstrate a silicon photonic coherent MIMO processor using a photonic Crossbar (Xbar) layout. Successful experimental validation of its performance as a 4×4 MIMO processor and a 3×3 MIMO with on-chip phase retrieval is presented.

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Multi-User 6G Radio Access Networks: THz Fiber Wireless X-Haul of a Multi-Beam Millimeter Wave Antenna

Maria Vargemidou, Ronis T. Maximidis, Panagiotis N. Toumasis, Konstantina Kanta et autres

The rise of the 6G era promotes massive broadband wireless connectivity in dense multi-user networks, equipped with flexible X-haul transport schemes. This work presents the first experimental demonstration of the end-to-end signal flow of a flexible THz Fiber Wireless (FiWi) X-haul that …

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A Just-in-Time Medium-Transparent MAC Protocol for Multi-Service 5G X-haul Transport Networks

Marios Gatzianas, George A. Kalfas, D. Palianopoulos, Christos Vagionas et autres

We introduce a Just-In-Time Medium-Transparent MAC (jMT-MAC) protocol that provides a transmission schedule for Analog-RoF Fiber-Wireless 5G and beyond X-haul networks supporting multiple services with variable packet sizes. jMT-MAC efficiently places each pending data packet in the polling-sequence, according to an elegant …

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Multi-beam Optical Beamformer PICs for LiDAR and RADAR Applications

Dimitra A. Ketzaki, Ronis T. Maximidis, Stephanos Kovaios, Apostolos Tsakiridis et autres

The optical beamformers that rely on Photonic Integrated Circuits (PICs) have emerged as highly reliable alternatives compared to the bulky and energy-hungry RF chains and mechanical steering systems. Stemming from the rapid penetration of PIC technologies into both the radiofrequency (RF) and …

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Online Energy-Efficient Resource Allocation in Integrated Terrestrial and Satellite 6G Networks

Marios Gatzianas, C. Bratsoudis, George A. Kalfas, Christos Vagionas et autres

In this paper, we jointly study the real-time user association, traffic routing and x-Network Function (xNF) placement problem in an integrated Terrestrial and Satellite 6G Network (TN-SN), with the aim of maximizing the network energy efficiency and user acceptance ratio. We formulate …

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Flexible Optical Circuit Switched Network Architecture based on Tunable SFP+ Transceivers for Reconfigurable Low-Latency 5G/6G Networks

George Michail, Maria Vargemidou, Christos Vagionas, Marios Gatzianas et autres

A flexibly reconfigurable optical circuit switched edge network architecture relying on wavelength-tunable SFP+ transceivers is presented for the first time for reconfigurable, low-latency 5G/6G networks. The proposed solution employs traditional cost-effective, fixed wavelength 10G SFP+ transceivers as grey optics towards the access …

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MIMO Signals Processing Utilizing Optical Crossbar Linear Operator

Ronis T. Maximidis, Stefanos Kovaios, Ioannis Roumpos, Apostolos Tsakyridis et autres

This paper introduces an innovative photonic MIMO processing architecture through the adaptation of a crossbar linear operator. The merits of this approach, such as restorable fidelity and reduced programming complexity, are highlighted. Experimental validation is conducted using a 4×4 crossbar-integrated photonic chip, …

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An Optimized Medium-Transparent MAC Protocol for Multi-Service FiWi 5G Transport Networks

George A. Kalfas, Marios Gatzianas, D. Palianopoulos, Christos Vagionas et autres

We present an optimized Medium-Transparent MAC (oMT-MAC) protocol for Analog-RoF Fiber-Wireless 5G and beyond X-haul networks, capable of generating an optimum transmission schedule, which boosts the protocol's efficiency by utilizing the full delay budget of higher priority flows. Results show that oMT-MAC's …

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Sub-THz fiber wireless multi-IFoF fronthaul of a V-band massive MIMO antenna for multi-user 6G networks

Maria Vargemidou, Panagiotis N. Toumasis, Konstantina Kanta, Ronis T. Maximidis et autres

Three D-band Fiber-Wireless Multi-IFoF links each with 0.5 Gb/s per beam are experimentally transmitted across a 7km fiber and a V-band MIMO antenna with 90°-degree RF-beamsteering, forming the first demonstration of a THz Fiber-Wireless X-haul of a multi-beam mmWave antenna.

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An integrated multi-beam optical beamformer architecture with beam-shaping capabilities

Stefanos Kovaios, Ioannis Roumpos, Ronis T. Maximidis, A. Timiani et autres

Recent demonstrations of optical phased arrays lack the capability of generating simultaneously multiple beams. We propose an optical multibeam beamformer with independent beams control, relying on a crossbar architecture. The beamforming was validated experimentally, with achieved steering angles up to 8o and …

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First real-time demonstration of a flexible multi-λ DRoF/ARoF/SDoF transport for fiber/mmWave RAN

Panagiotis N. Toumasis, Konstantina Kanta, Christos Vagionas, Giannis Giannoulis et autres

A reconfigurable, technology-agnostic X-haul optical infrastructure with active wavelength routing for converged A-RoF/D-Band, D-RoF/E-Band and SDoF streams was demonstrated. The deployed SDN-enabled AWGR-based transport topology supported real-world services including HD video and mobile traffic.

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