Recent publications

March 2023

Real-Time Sub-THz Link Enabled Purely by Optoelectronics: 90–310 GHz Seamless Operation

Efstathios Andrianopoulos, Norbert Keil, Martin Schell, David de Felipe Mesquida, Simon Nellen, Ch. Kouloumentas, Robert Kohlhaas, Panos Groumas, Christos Tsokos, Tianwen Qian, Milan Deumer, Dimitrios Kritharidis, Panteleimon-Konstantinos Chartsias, Herkules Avramopoulos, Garrit William Johannes Schwanke, Nikolaos K. Lyras, Evangelos Pikasis, Georgia Ntouni, Eleftherios Loghis, Elias Tsirbas, Maria Massaouti

A photonics-enabled sub-THz wireless link operating in real-time settings, using a PIN-PD-based THz emitter, and a THz receiver based on an ultra-fast photoconductor is demonstrated. The real-time generation and detection of the information...

March 2023

System for 3D Acquisition and 3D Reconstruction Using Structured Light for Sewer Line Inspection

Johannes Wolf Künzel, Peter Eisert, Anna Hilsmann, Karl-Heinz Franke, Darco Vehar, Rico Nestler

We introduce an innovative system based on single-shot structured light modules that facilitates the detection and classification of spatial defects like jutting intrusions, spallings, or misaligned joints. This system creates highly accurate 3D...

February 2023

Decentral and Incentivized Federated Learning Frameworks: A Systematic Literature Review

Leon Witt, Wojciech Samek, Mathis Heyer, Kentaroh Toyoda, Dan Li

The advent of federated learning (FL) has sparked a new paradigm of parallel and confidential decentralized machine learning (ML) with the potential of utilizing the computational power of a vast number of Internet of Things (IoT), mobile, and...

February 2023

MIMO Systems with Reconfigurable Antennas: Joint Channel Estimation and Mode Selection

Fariba Armandoust, Ehsan Tohidi, Martin Kasparick, Li Wang, Ahmet Hasim Gokceoglu, Slawomir Stanczak

In this paper, we develop a low-complexity iterative mode selection algorithm for data transmission in a Reconfigurable antennas (RAs) MIMO system. Furthermore, we study channel estimation of an RA multi-user MIMO system. We propose a mode...

January 2023

Quantus: An Explainable AI Toolkit for Responsible Evaluation of Neural Network Explanations and Beyond

Anna Hedström, Wojciech Samek, Sebastian Lapuschkin, Leander Weber, Dilyara Bareeva, Franz Motzkus, Marina M.-C. Höhne, Daniel Krakowczyk

Explainability is supposed to strengthen trust in artificial intelligence, it is necessary to systematically review and compare explanation methods in order to confirm their correctness. We therefore built Quantus—a comprehensive, evaluation...

January 2023

Enabling Optical Modulation Format Identification Using an Integrated Photonic Reservoir and a Digital Multiclass Classifier

Guillermo von Hünefeld, Colja Schubert, Ronald Freund, Isaac Sackey, Gregor Ronniger, Johannes K. Fischer, Pooyan Safari, Rijil Thomas, Enes Seker, Piotr Cegielski, Stephan Suckow, Max Lemme, David Stahl, Sarah Masaad, Emmanuel Gooskens, Peter Bienstman

We numerically show modulation format identification in the optical domain using Silicon-on-Insulator-based Photonic-Integrated-Circuit (PIC) reservoir. Identification of 32 GBd single-polarization signals of OOK, PAM4, BPSK and QPSK is...

January 2023

Ultrafast quantum key distribution using fully parallelized quantum channels

Robin Terhaar, Nicolas Perlot, Jasper Rödiger, Fabian Beutel, M. Wolff, Jonas Hanke, Nino Walenta, W. Hartmann, M. Häußler, M. Wahl, T. Röhlicke, W. H. P. Pernice, C. Schuck, Helge Gehring, Nicolai Walter, Peter Hanne, Maximilian Diedrich, Max Tillmann, Mahdi Ahangarianabhari

Quantum key distribution (QKD) offers secure communication protected by the laws of quantum mechanics. Aiming for an application-oriented solution, we designed a multichannel superconducting nanowire single photon detector system, as well as a...

January 2023

Continuous intraoperative perfusion monitoring of free microvascular anastomosed fasciocutaneous flaps using remote photoplethysmography

Sebastian Schraven, Peter Eisert, Anna Hilsmann, Eric Wisotzky, Benjamin Kossack, Maximilian Jung, Lotte Skopnik, Robert Mlynski, Daniel Strüder, Justus Groß

Intraoperative monitoring of free flaps using remote photoplethysmography (rPPG) signal provides objective and reproducible data on tissue perfusion. We developed a monitoring algorithm for flap perfusion, which was evaluated in fifteen patients...

January 2023

Recovering Fine Details for Neural Implicit Surface Reconstruction

Decai Chen, Oliver Schreer, Peter Eisert, Ingo Feldmann, Peng Zhang

In this paper, we present D-NeuS, a volume rendering-based neural implicit surface reconstruction method capable to recover fine geometry details, which extends NeuS by two additional loss functions targeting enhanced reconstruction quality.

January 2023

Investigating the Performance and Suitability of Neural Network Architectures for Nonlinearity Mitigation of Optical Signals

Vegenshanti Valerian Dsilva, Colja Schubert, Ronald Freund, Isaac Sackey, Gregor Ronniger, Guillermo von Hünefeld, Binoy Chacko

We compare three different neural network architectures for nonlinearity mitigation of 32 GBd OOK and QPSK signals after transmission over a dispersion-compensated link of 10-km SSMF and 10-km DCF. OSNR gains up to 2.2 dB were achieved using...

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