Recent publications

January 2024

AudioMNIST: Exploring Explainable Artificial Intelligence for Audio Analysis on a Simple Benchmark

Sören Becker, Klaus-Robert Müller, Wojciech Samek, Sebastian Lapuschkin, Marcel Ackermann, Johanna Vielhaben

Explainable Artificial Intelligence (XAI) is targeted at understanding how models perform feature selection and derive their classification decisions. This paper explores post-hoc explanations for deep neural networks in the audio domain....

January 2024

Highly Sensitive Switchable Sensors for Hydroxide on Glass Surfaces Based on Isoquinolinium-Quinolinium-substituted Acetylenes

Alexander Tombrink, Eike Hübner, Felix Lederle, Jan C. Namyslo, Andreas Schmidt, Sven Nagorny, Sviatoslav Batsyts, Jörg Adams

Bi-substituted acetylenes with a quinolinium and an isoquinolinium substituent are described, which reversibly form intensely colored adducts with O-nucleophiles and thus enable the detection of >0,5 ppm hydroxide on the surfaces of various...

December 2023

A Performance Comparison of OFDM and Pulsed PHY Modulations in Optical Wireless Communications

Malte Hinrichs, Volker Jungnickel, Ronald Freund, Anagnostis Paraskevopoulos, Maria Pontes, Marcelo Segatto, Jair Silva, Helder Rocha, Wesley Costa

Experimental tests of the OFDM and OOK-based PHYs in the Li-Fi standard IEEE 802.15.13-2023 show that the higher peak data rates of OFDM and the longer reach of OOK make them suitable for deployment in down- and uplink use cases, respectively.

December 2023

Full-Duplex Operation of ISAC: Self-Interference Reduction from the Lens of IRS

Ehsan Tohidi, Slawomir Stanczak, Ramez Askar, Zoran Utkovski

This paper addresses the self-interference problem in full duplex operation by leveraging an intelligent reflecting surface (IRS) to provide spatial separation of the transmitted and the received (i.e. reflected) signal in a monostatic sensing...

December 2023

4 Gbit/s optical wireless communication with high-power transmitter

Malte Hinrichs, Volker Jungnickel, Martin Schubert, Ronald Freund, Dominic Schulz, Ronald Böhnke, Giulio Boniello, Mariana Lyra Silveira, Wen Xu

We demonstrate data rates up to 4 Gbit/s with a VCSEL-based transmitter prototype using pulsed on-off-keying modulation for high-speed LiFi with a large coverage area.

December 2023

L4S Congestion Control Algorithm for Interactive Low Latency Applications over 5G

Jangwoo Son, Thomas Schierl, Cornelius Hellge, Yago Sanchez de la Fuente, Christian Hampe, Dominik Schnieders

In recent years, immersive applications such as Cloud XR have emerged, which require very low latency to ensure a high quality of experience. This paper presents a congestion control algorithm combined with L4S to achieve stable and low latency...

December 2023

Guard-ring free InGaAs/InP single photon avalanche diodes for C-band quantum communication

Pascal Rustige, Patrick Runge, Martin Schell, Jan Krause, Lorenz Eckoldt

We present a guard-ring free InGaAs/InP single photon avalanche diode with 20 µm diameter for the optical C-band. At 225 K, 25.6 µs dead time and 17% detection efficiency, the dark count rate is 3 kcps with 0.5% afterpulsing probability. This...

November 2023

From Empirical Measurements to Augmented Data Rates: A Machine Learning Approach for MCS Adaptation in Sidelink Communication

Asif Abdullah Rokoni, Slawomir Stanczak, Martin Kasparick, Daniel Schäufele

Due to the lack of a feedback channel in the C-V2X sidelink, finding a suitable MCS level is a difficult task. In this paper, we propose an ML approach that uses quantile prediction to predict the MCS level with the highest achievable data rate....

November 2023

Hybrid integration of Polymer PICs and InP optoelectronics for WDM and SDM terabit intra-DC optical interconnects

Efstathios Andrianopoulos, Christos Kouloumentas, Patrick Runge, Norbert Keil, Martin Moehrle, Ute Troppenz, Annachiara Pagano, David de Felipe Mesquida, Michael Theurer, Martin Kresse, Hercules Avramopoulos, Anna Chiado Piat, Panos Groumas, Christos Tsokos, Paraskevas Bakopoulos, Madeleine Weigel, Maria Massaouti, Zerihun Tegegne, Giorgos Megas

This paper presents a hybrid photonic integration concept based on the use of a polymer motherboard, InP EML arrays and InP PD arrays to realize WDM and SDM Terabit optical engines operating at 100-Gb/s or even at 20! 0-Gb/s per lane. The optical...

November 2023

Design and Characterization of Dispersion-Tailored Silicon Strip Waveguide toward Wideband Wavelength Conversion

Hidenobu Muranaka, Tomoyuki Kato, Shun Okada, Tokuharu Kimura, Yu Tanaka, Tsuyoshi Yamamoto, Isaac Sackey, Gregor Ronniger, Robert Elschner, Carsten Schmidt-Langhorst, Takeshi Hoshida

One of cost-effective ways to increase the transmission capacity of current standard wavelength division multiplexing (WDM) transmission systems is to use a wavelength band other than the C-band to transmit in multi-band. We proposed the concept...

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