Aktuelle Publikationen

Juli 2025

Demonstration of a Programmable Node Prototype for Spatial Lane Switching and Band Switching

Abdelrahmane Moawad, R. Morro, Colja Schubert, Robert Emmerich, Johannes K. Fischer, Mohammad Behnam Shariati, A. Giorgetti, Caio Marciano Santos, Hussein Zaid

In this work, we designed a passive 2×2 MBoSDM node prototype that is capable of band and space/fiber switching. The prototype is fully controllable though an SDN agent and supports selective band switching as well as add/drop functions for the...


Juni 2025

Interoperable and Open Source Solution for Anchoring Augmented Reality Content to the Real World

Sylvain Buche, Ingo Feldmann, Sylvain Renault, Jérome Royan, Patrick Harns, Hugo Kreber, Jeremy Lacoche, Stephane Louis Dit Picard

This research demonstration presents an open source end-to-end solution for facilitating the anchoring of virtual content in the real world based on various platforms thanks to the interoperable specifications of the ETSI Augmented Reality...


Juni 2025

A Fast and Accurate EDFA Model for the Optimization of Power-Efficient SDM Subsea Transmission Systems

Aymeric Arnould, Ronald Freund, Georg Rademacher

In this paper, we present an adaptation of the extended Saleh model, using a coarse segmentation of the erbium doped fiber, to accurately include the impact of EDFA physics, with a limited complexity increase, in power efficiency predictions for...


Juni 2025

Beam-Steered Sub-THz Channel Measurements in D-Band in an Industrial Environment

Alper Schultze, Wilhelm Keusgen, Michael Peter, Ramez Askar, Taro Eichler, Mathis Schmieder

This paper presents results of a channel measurement campaign carried out in a production hall at a carrier frequency of 160 GHz which were analyzed with regards to beam-steering and macro-diversity gains.


Juni 2025

On the Impact of OFDM Waveform in ISAC Systems

Abdolvakil Fazli, Slawomir Stanczak, Zoran Utkovski, Patrick Agostini, Ehsan Tohidi

This paper highlights the differences between the standard matched filter (a correlation-based method) and symbol-domain processing, providing insights into how pulse shaping affects sensing performance in multicarrier schemes like OFDM....


Juni 2025

Conflict Mitigation Approach for O-RAN xApps

Hammad Zafar, Slawomir Stanczak, Martin Kasparick, Ehsan Tohidi

Open Radio Access Network (O-RAN) enables interoperability by allowing operators to choose equipment from multiple vendors. However, conflicting objectives between xApps, such as energy efficiency and load balancing, require coordination, raising...


Juni 2025

Angle-Resolved Channel Measurements at 28 and 160 GHz in Open Office Industrial-Like Environment

Mathis Schmieder, Wilhelm Keusgen, Michael Peter, Ramez Askar, Alper Schultze, Niclas Woodstock Kullig

This paper investigates angle-resolved channel measurements at 28 and 160 GHz within an industrial-like open office environment. It presents findings on power metrics, delay, and angular characteristics based on 135 measurement positions. Results...


Juni 2025

N-Heterocyclic Olefins of Pyrazole and Indazole

Bloin Zhu, Eike Hübner, Felix Lederle, Andreas Schmidt, Rouven Woyciechowski

Deprotonation of 3-methylpyrazolium and 3-methylindazolium salts yielded N-heterocyclic olefins (NHOs), which reacted with isocyanates, halogens, and carbon disulfide. Calculated proton affinities are 261 kcal/mol (indazole NHOs) and 272 kcal/mol...


Juni 2025

Datasets for QoT estimation in SDM networks

Hassan Akbari, R. Freund, Johannes K. Fischer, Mohammad Behnam Shariati, Pooyan Safari, Juan L. Morrone

The advancement of machine learning (ML)-assisted solutions for monitoring and performance analysis in space-division multiplexing (SDM) networks has been significantly constrained by a shortage of large, well-structured, and publicly available...


Juni 2025

High-Capacity THz Wireless Transmission Supporting Future 6G Optical Networks

Colja Schubert, Martin Schell, Ronald Freund, Robert Elschner, Simon Nellen, Robert Kohlhaas, Oliver Stiewe, Milan Deumer, Thomas Merkle, Axel Tessmann, In-Ho Baek, Frederik Bart, Fred Meier, Andreas Maaßen, Kallyan Das, Simon Schütze, Markus Rösch

The paper reviews recent developments in high-capacity THz wireless transmission, focusing on point-to-point links in the lower THz frequency range around 300 GHz. Available technologies and challenges for integration into future 6G optical...


Juni 2025

140 GBd S-C-L-Band Transmission System Enabled by TFLN Coherent Driver Modulator and InP Coherent Receiver Engine

Robert Emmerich, Patrick Runge, Martin Schell, Colja Schubert, Ronald Freund, Alexander Schindler

We demonstrate high symbol rate (128/140-Gbaud QPSK/16QAM) transmission for multi-band systems (S-C-L-band) with commercially available components. The broadband thin film lithium niobate high-bandwidth modulator and the HHI designed InP coherent...


Mai 2025

Clock offset synchronization with sublinear complexity for quantum key distribution on low-level hardware

Jan Krause, Ronald Freund, Jonas Hilt, Nino Walenta

We introduce iQSync, a clock-offset recovery method for quantum key distribution. iQSync achieves sub-linear computational complexity, allowing for the implementation on low-level hardware. We demonstrate the method for channel attenuations...


Mai 2025

Monolithic InP Ring Resonator based Laser with 40 kHz Linewidth and 40 nm Tuning Range

Hendrik Boerma, Patrick Runge, Martin Schell, Arbnor Berisha, Daniel Haubenreißer

A narrow linewidth tunable laser based on ring resonators is presented. It uses low loss passive waveguides implemented in a monolithic InP photonic integrated circuit. The laser can be tuned over a wavelength range from 1559 nm to 1602 nm. The...


Mai 2025

Single-Carrier 2.56 Tb/s (3-mode x 128-GBd x DP-16QAM) Transmission over a 53.7 km Few Mode Fiber

Nicolas Braig-Christophersen, Colja Schubert, Carsten Schmidt-Langhorst, Ronald Freund, Robert Emmerich, Fabian Chowanek, Georg Rademacher, Hideaki Furukawa, Aymeric Arnould, Benjamin J. Puttnam, Kazuhiko Aikawa, Juan Carlos Alvarado Zacarias, Rodrigo Amezuca-Correa, Ruby S. B. Ospina

We investigate high-symbol rate SDM transmission using 16 to 128 GBd QPSK, 16-QAM and 64-QAM modulation over a 3-mode fiber. An aggregated net rate of 2.56 Tb/s was obtained after 54 km transmission using 128 GBd 16-QAM signals.


Mai 2025

A Flexible Real-Time Quantum Key Distribution System for Fiber and Free-Space Links

Jan Krause, Ronald Freund, Jonas Hilt, Nino Walenta

To enable QKD in various scenarios, we developed a 625 MHz real-time autonomous timebin-phase QKD system with custom clock synchronization. We demonstrate the system’s performance and robustness under unstable link conditions, a variety of fiber...


Mai 2025

Timebin-Phase BB84 Quantum Key Distribution Using Telecom-Wavelength Fiber-Coupled SPADs

Jan Krause, Patrick Runge, Martin Schell, Ronald Freund, Nino Walenta, Pascal Rustige

Single-photon avalanche detectors (SPADs), which operate without cryogenic cooling, are a core component for practical QKD systems. We demonstrate 13-hour continuous key generation with our timebin-phase BB84 QKD system using our InGaAs/InP SPAD,...


Mai 2025

Experimental demonstration of robust spatial-diversity combining for coherent free-space optical transmission

Abraham Johst, Lutz Molle, Michael Rohde, Ronald Freund, Markus Nölle, Nicolas Perlot

Spatial-diversity schemes are applied to improve signal quality of coherent free-space optical transmission systems with uncorrelated phase noise. We compare the performance of conventional schemes (MRC, SDC) to a newly proposed one (X-MRC).


Mai 2025

Realtime-Rendering of Dynamic Scenes with Neural Radiance Fields

Kilian Leonard Krause, Peter Eisert, Anna Hilsmann, Wieland Morgenstern

This paper addresses the challenge of real-time rendering of dynamic 3D scenes using Instant Neural Graphics Primitives (iNGP), training a separate radiance field for each frame. To enable interactive VR playback, efficient data storage and...


Mai 2025

Inter-hospital transferability of AI: A case study on phase recognition in cholecystectomy

Lasse Renz-Kiefel, Peter Eisert, Anna Hilsmann, Eric Wisotzky, sebastian Lünse, Rene Mantke

Identifying surgical phases is a crucial component of surgical workflow analysis, facilitating the automated evaluation of surgical procedures’ performance and efficiency. A significant challenge in developing neural networks for surgical phase...


Mai 2025

Space-Division Multiplexed Transmission from the Lab to the Field

C. Antonelli, A. Mecozzi, Colja Schubert, L.K. Oxenløwe, A. Carena, Robert Emmerich, Georg Rademacher, Nicolas Fontaine, Giammarco Di Sciullo, Andrea Marotta, Fabio Graziosi, Takuji Nagashima, Alberto Gatto, Paola Parolari, Pierre Sillard, Roland Ryf, Lauren Dallachiesa, R.S. Luis, D. A. Shaji, D. Ri-bezzo, M. Mazur, T. Nakanishi, D. Bacco, A. Zavatta, M. Zahidy, D. Orsuti, M. Fasano, P. Boffi, N. Sambo, A. Nespola, S. Guerrier, C. Dorize, J. Renaudier, N. Hoghooghi, F. Quinlan, Qi Wu

Researchers from the University of L’Aquila, NICT, Finisar, Prysmian, Nokia Bell Lab and Fraunhofer HHI Space-Division Multiplexed Transmission technologies from the Lab to the Field and present a summary for their work in this invited...


April 2025

Resolution and Speed Trade-offs in FMCW LiDAR with MEMS Mirror Scanning and Advanced Signal Processing

Sarah Cwalina, Volker Jungnickel, Patrick Runge, Norman Laske, Avinash Nittur Ramesh, Maria A. Gonzalez-Huici

We address system trade-offs, e.g. between resolution and speed of a coherent scanning LiDAR. We analyze the performance of our real-time FMCW LiDAR prototype with a high-quantumefficiency coherent receiver, two-dimensional...


April 2025

SPNeRF: Open Vocabulary 3D Neural Scene Segmentation with Superpoints

Weiwen Hu, Oliver Schreer, Peter Eisert, Ingo Feldmann, Marcus Zepp, Niccolo Parodi

We introduce SPNerf, a NeRF based zero-shot 3D segmentation approach that leverages geometric priors. We integrate geometric primitives derived from 3D scene into NeRF training to produce primitive-wise CLIP features, avoiding the ambiguity of...


April 2025

Global or local modeling for XGBoost in geospatial studies upon simulated data and German COVID-19 infection forecasting

Ximeng Cheng, Jackie Ma

This research compares the local- and global modeling ways of XGBoost in the geospatial studies. Two experiments based on simulation data and German COVID-19 infection data were conducted to compare the two modeling ways from multiple aspects....


April 2025

Joint power control, beamforming, and sleep-mode selection for energy-efficient cell-free networks using surrogate machine learning models

Ricky Ooi, Slawomir Stanczak, Renato L. G. Cavalcante, Lorenzo Miretti, Rouaa Diab

In cell-free networks, system throughput is enhanced by allowing more than one access point (AP) to serve each user, which may lead to high energy consumption. To circumvent this, this paper presents a surrogate optimization technique using...


April 2025

Artificial Neural Network With Photonic Reservoir for Multiclass Modulation Format Identification

Guillermo von Hünefeld, Colja Schubert, Ronald Freund, Johannes K. Fischer, Pooyan Safari, Rijil Thomas, Enes Seker, Stephan Suckow, Max Lemme, David Stahl, Peter Bienstman, Mahdi Kaveh, Mahtab Aghaeipour Kolyani, Joseph Hopfmüller

We successfully achieved MFI using a neuromorphic PIC with a photonic reservoir and digital readout, both in a laboratory environment and with commercial network equipment.


April 2025

Record length of 2000km weakly-coupled 7-core MCF produced from a single large-scale MCF preform

Sarah Cwalina, Kai Habel, Tobias Tiess, Michael Lorenz, Jong-Won Lee, Maximilian Schmitt, Jimmy E. Beavers, Nicolaj L. Andersen, Andreas C. Samson, Frederik N. Andersen, Qiulin Ma, Martin Böttcher, Kay  Schuster

We present the design and fabrication of more than 2000 km of a 7-core multi-core fiber (MCF) drawn from a single large-scale MCF preform. The fiber was fabricated without any online fiber breaks and exhibits axially excellent geometrical...


April 2025

Designing Citizen Science tools towards increased awareness and participatory policy making for air quality: The Case of COMPAIR

Pavel Kogut, Oliver Schreer, Sylvain Renault, Lieven Raes, Burcu Celikkol, Susie Ruston McAleer, Gert Vervaet, Christos Alexopoulos

The EU-funded project COMPAIR designed advanced monitoring and simulation tools that aggregate data from multiple sources to provide a well-rounded view of air pollution and related challenges e.g. traffic, waste management, energy use. Built-in...


April 2025

3DGS.zip: A survey on 3D Gaussian Splatting Compression Methods

Milena Teresa Bagdasarian, Mario Goldenbaum, Peter Eisert, Anna Hilsmann, Wieland Morgenstern, Florian Tim Barthel, Paul Knoll, Yi-Hsin Li

3D Gaussian Splatting (3DGS) is a powerful technique for real-time radiance field rendering but is limited by its high storage and memory requirements. This survey provides the first comprehensive analysis of existing compression and compaction...


April 2025

Kernel-Based Signal Processing for Simultaneous Transmit-Receive Systems

Mohammad Hossein Attar, Slawomir Stanczak, Ramez Askar

We address digital self-interference cancellation (SIC) in simultaneous transmit-receive systems using data-driven approaches. We propose kernel-based learning methods -- adaptive projected subgradient method (APSM) and support vector regression...


April 2025

Intraoperative measurements in stapedotomy using 3D stereo imaging for optimal prosthesis length selection

Eric Wisotzky, Peter Eisert, Anna Hilsmann, Sebastian Schraven, Robert Mlynski, Felix Lausch, Linus Kienle, Sahra von Bonn-Ytrehus

This study introduces a novel approach for precise, radiation-free intraoperative measurements using 3D stereoscopic imaging integrated into a digital surgical microscope for stapedotomy. By optimizing the calibration of stereoscopic zoom-focus...


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