Recent publications

June 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...


June 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...


June 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...


May 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...


May 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...


May 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...


May 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.


May 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...


May 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...


May 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,...


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