Dr. Anagnostis Paraskevopoulos Profile

Dr. Anagnostis Paraskevopoulos

Group Leader “Intra-machine communications” at Fraunhofer HHI

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Publications (5)

Proceedings Article | 15 March 2023 Presentation + Paper

18km bidirectional free-space optical link with multi-aperture antenna and DWDM SFP+ transceivers (VERTIGO project)

Nicolas Perlot, Peter Hanne, Abraham Johst, Marcel Rothe, Bill Antonio Bernhardt, Anagnostis Paraskevopoulos, Ronald Freund

Proceedings Volume 12413, 124130W (2023) https://doi.org/10.1117/12.2652245

KEYWORDS: Satellites, Laser communication terminals, Optical amplifiers, Free space optics, Field programmable gate arrays, Single mode fibers, Scintillation, Transceivers, Dense wavelength division multiplexing, Antennas

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Proceedings Article | 11 June 2021 Open Access

The H2020 VERTIGO project towards tbit/s optical feeder links

A. Le Kernec, L. Canuet, A. Maho, M. Sotom, D. Matter, L. Francou, J. Edmunds, M. Welch, E. Kehayas, N. Perlot, M. Krzyzek, Anagnostis Paraskevopoulos, J. Leuthold, Y. Horst, J. Bourderionnet, A. Brignon, E. Lallier, V. Billault, L. Leviandier, J.-M. Conan, N. Védrenne, C. Lim, A. Montmerle-Bonnefois, C. Petit, L. Stampoulidis, M. Fehrenz, T. Lehnigk-Emden

Proceedings Volume 11852, 1185217 (2021) https://doi.org/10.1117/12.2599229

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To concurrently cope with the scarcity of RF frequency bands, the growing capacity demand and the required lower cost of the ground segment, Very High Throughput Satellites systems must rely on new technical solutions. Optical feeder links are considered as a promising alternative to surpass classical RF technology, offering assets inherent to optical technologies (large bandwidth, no frequency regulation, low beam divergence, components availability). Nevertheless the potential of this technology shall not conceal the remaining challenges to be overcome to make it relevant for operational missions : clouds, turbulence, power generation and high efficiency modulations. VERTIGO (Very High Throughput Satellite Ground Optical Link) is a 3-year H2020 project funded by the European commission and started mid-2019 focusing on the optical link itself regardless of site diversity aspect and aiming at demonstrating in a ground demonstration required technologies to implement very high capacity optical feeder links. In particular, VERTIGO is built on 3 pillars each addressing a key issue for the implementation of optical feerder links: 1) Throughput increase through the use of advanced schemes with high spectral and power efficiency compared to current modulations used in space, as well as RF-over-Fiber approach. 2) High optical power generation to close the demanding link budgets by developing on-board and ground means to raise the transmitted optical power, not only based on amplifier power increase, but also on incoherent/coherent power combining. 3) Opto-mechanical and digital techniques for the mitigation of atmospheric propagation impairments, to make full use of throughput and power increases. Several demonstrations in-flight or on-ground already demonstrated separately key aspects (atmospheric propagation and impairments mitigation techniques, modulation format, high power…), for the implementation of optical (feeder) links. These aspects are closely linked since the solutions to each of them are necessary but not sufficient to allow for high throughput transmissions. VERTIGO concept is to address each key issue with at least one solution and to combine them in an unprecedented manner. To reach these objectives, VERTIGO will lean on a highly skilled consortium composed of : CREONIC, ETH Zürich, Fraunhofer HHI, Gooch and Housego, Leo Space Photonics RD, ONERA, Thales Research and Technology, Thales Alenia Space in France and Switzerland. This paper will present the VERTIGO project and its status.

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Proceedings Article | 27 May 2009 Paper

High speed (>100 Gbps) key components for a scalable optical data link to be implemented in future maskless lithography applications

A. Paraskevopoulos, S.-H. Voss, M. Talmi, G. Walf

Proceedings Volume 7470, 747011 (2009) https://doi.org/10.1117/12.835200

KEYWORDS: Receivers, Integrated optics, Channel projecting optics, Maskless lithography, Free space optics, Wafer-level optics, Transceivers, Semiconducting wafers, Field programmable gate arrays, Electron beams

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Proceedings Article | 18 March 2009 Paper

Scalable (24-140 Gbps) optical data link well adapted for future maskless lithography applications

A. Paraskevopoulos, S.-H. Voss, M. Talmi, G. Walf

Proceedings Volume 7271, 72711I (2009) https://doi.org/10.1117/12.811495

KEYWORDS: Free space optics, Receivers, Channel projecting optics, Maskless lithography, Integrated optics, Data processing, Data transmission, Field programmable gate arrays, Transmitters, Wafer-level optics

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Proceedings Article | 28 March 2008 Paper

MAGIC: a European program to push the insertion of maskless lithography

L. Pain, B. Icard, S. Tedesco, B. Kampherbeek, G. Gross, C. Klein, H. Loeschner, E. Platzgummer, R. Morgan, S. Manakli, J. Kretz, C. Holhe, K.-H. Choi, F. Thrum, E. Kassel, W. Pilz, K. Keil, J. Butschke, M. Irmscher, F. Letzkus, P. Hudek, A. Paraskevopoulos, P. Ramm, J. Weber

Proceedings Volume 6921, 69211S (2008) https://doi.org/10.1117/12.772472

KEYWORDS: Semiconducting wafers, Lithography, Photomasks, Manufacturing, Electron beams, Electron beam lithography, Nanofabrication, Computed tomography, Prototyping, Maskless lithography

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