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Uncertainty explanation of artificial intelligence models by SHAP
The “black box” characteristic of AI models has received widespread attention from scientists. Explainable artificial intelligence (XAI) methods and uncertainty estimation of AI models are two ways to open the “black box”. However, little...
Room-temperature, 96×96 pixel 3D-stacked InGaAs/InP SPAD sensor with complementary gating for flash LiDAR
„A room-temperature 3D-stacked flash LiDAR sensor is presented for the short-wave infrared (SWIR). The 96×96 InGaAs-InP SPAD array in the top tier is biased by a circuit at the bottom tier. Intensity images and depth maps are shown both indoors...
System-Level Demonstration of a 3D-Integrated Optical 16×16 Benes Switch
We present the first fully packaged 16×16 Benes optical switch based on 3D photonic integration in HHI’s PolyBoard platform and demonstrate its evaluation at system-level in a 25 Gb/s full-duplex optical link. Stable throughput was maintained...
ISAC Beamforming Design Based on a Matrix Formulation With Improved Efficiency
We introduce a novel ISAC beamforming method enabling joint MIMO radar sensing and multi-user MIMO communication. By leveraging a matrix nearness formulation and an efficient solver, our approach drastically reduces computation, avoiding costly...
XR4HUMAN Code of Conduct for the Human-Centered and Ethical Development of Immersive Technologies
The XR4Human Code of Conduct sets forth the ethical obligations for everyone involved in technological innovation and governance of immersive or extended reality (XR) technologies.
Utilizing Degeneracy in a Few-Mode Fiber to Demonstrate Entanglement Distribution
The degenerate modes of a few-mode fiber retain entanglement and allow for distribution over 50-km of single-mode fibers, paving the way for future research towards multi-port bidirectional beam splitters with a consistent coupling ratio across...
Exploring the potential of longitudinal power monitoring for detecting physical-layer attacks
In this work, we investigate the effectiveness of LPM in detecting physical-layer attacks. A detailed simulative analysis is conducted for fiber tapping, addressing aspects such as monitoring implementation, security vulnerabilities, and...
Qubit-Based Clock Drift Correction for Resource-Efficient Quantum Key Distribution
We present a qubit-based clock drift correction method with low computational requirements, that demonstrates a performance equal to a clock drift correction via a dedicated clock channel. Our method enables stable long-term operation as well as...
Dynamic Rerouting of Quantum Key Distribution Links During Live Operation for Software-Defined Networks
Live rerouting of quantum key distribution links poses new synchronization challenges. We demonstrate the seamless handling of multi-minute channel interruptions and fiber length changes exceeding 100 km during live system operation and over...
Catalytically active plate heat exchanger for flexible hydrogen release from perhydro benzyltoluene
A catalytic plate reactor derived from the design of conventional plate heat exchangers was used for the continuous and dynamic dehydrogenation of perhydro benzyltoluene, a LOHC. The surface of heat exchanger plates has been catalytically...
Software for dataset-wide XAI: From local explanations to global insights with Zennit, CoRelAy, and ViRelAy
The predictive capabilities of Deep Neural Networks (DNNs) are well-established, yet the underlying mechanisms driving these predictions often remain opaque. The advent of Explainable Artificial Intelligence (XAI) has introduced novel...
Leveraging Shared Data and Models for ML-Based QoT Estimation: Toward Standardized and Generalizable Models
This work presents the first study of a machine learning-based quality-of-transmission (QoT) estimator using synthetic and experimental datasets from four different organizations, including live network data. It investigates the feasibility of a...
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Innovations for the digital society
Innovations for the digital society of the future are the focus of research and development work at the Fraunhofer Heinrich Hertz Institute HHI. In this area, Fraunhofer HHI is a world leader in the development of mobile and optical communication networks and systems, fiber optical sensor systems as well as the processing and coding of video signals.
Together with international partners from research and industry, Fraunhofer HHI works in the whole spectrum of digital infrastructure – from fundamental research to the development of prototypes and solutions. The institute develops standards for information and communication technologies and creates new applications as an industry partner.
Innovations for the digital society of the future are the focus of research and development work at the Fraunhofer Heinrich Hertz Institute HHI. In this area, Fraunhofer HHI is a world leader in the development of mobile and optical communication networks and systems, fiber optical sensor systems as well as the processing and coding of video signals.