Poster Session Abstracts
Training Strategies for Learned Volterra MIMO Equalizers in WDM Systems Nelson Castro, Aston Institute of Photonic Technologies
Forward Error Correction for High-Capacity Transmission Systems Safiya Dabwan, Nelson Castro, Stylianos Sygletos
This research advances training strategies for a learned Volterra MIMO equaliser tailored for Wavelength Division Multiplexing (WDM) systems. Building upon prior success with minimal steps per span, our current focus is improving
We studied the interplay between forward error correction FEC and fibre nonlinearity compensation performed with digital backpropagation DBP in long-haul fibre channels. A state-of-the-art scheme based on
training efficiency. The equaliser integrates filters to address key signal impairments, and our work delves into refining training strategies for these filters. As part of the considered techniques, we explore the potential of applying transfer learning among the channels in the equaliser. This investigation yields valuable insights into the interplay of training strategies and filter optimisation, contributing to the enhanced performance of learned Volterra MIMO equalisers in WDM systems. Authors: Nelson Castro, Sonia Boscolo, Andrew Ellis, Stylianos Sygletos.
Bit Interleaved Coded Modulation BICM was developed and built up with concatenated FEC implementation. Several Implementations were then evaluated in a comprehensive setup with DBP of different complexities to determine configurations suitable for diverse applications. Our findings suggest that integrating 3 steps/span DBP can enhance the reach of 300 km channels by 30% to be 400 km, while maintaining a fixed coding overhead 27.5%. Interestingly, the same distance extension can be achieved without the need for DBP but at the cost of increasing the coding overhead from 27.5% to 41.67%. The utilized BICM scheme was proven to be equivalently efficient without a bit interleaving function, thereby, the elimination of that has contributed to reducing the overall complexity of the system.
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Introducing Automatic Initialization Procedure and Temperature-Independent Detection Anticipation Technique for a Plug-and-Play Quantum Key Distribution System Márton Czermann(1,2,), Benjámin Ott(1,2),
E-band amplifier based on combined neodymium-doped fibre and bismuth-doped fibre amplification
Áron Szabó(2), Péter Trócsányi(3), Attila Róka(1), Benedek Kovács(2)
Dr Aleksandr Donodin, Aston University The conventional optical networks exploit a bandwidth of only 10 THz allowed by commercially available Er-doped fibre amplifiers (EDFAs) in C- and L- optical bands (1530- 1620 nm). The multi-band transmission (MBT) maximizes the return on investments in the
The readiness of Quantum Communication Technologies has already been demonstrated all around the globe. A European initiative, called EuroQCI, aims to realize a quantum
communication infrastructure by the end of 2027, throughout the continent. Therefore, our focus is making these technologies integrable into our classical telecommunications infrastructure, while improving their quality parameters, following plug-and-play principles. In our poster, we present an automatic initialization process and patent-pending synchronization technique for a fiber-based plug- and-play Quantum Key Distribution (QKD) system that implements phase-encoding BB84 protocol. The initialization process helps us to configure the system with optimal parameters for a low QBER to achieve secure operation, while the synchronization technique allows photon detection anticipation even under continuously changing environmental conditions. Finally, our architecture enables us to choose between quantum protocols, giving flexibility to serve diverse application requirements. The system has been developed at Budapest University of Technology and Economics, in cooperation with Ericsson Hungary. Affiliation: (1) Department of Networked Systems and Services, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, (2) Ericsson Hungary, Budapest, Hungary (3) Department of Theoretical Physics, Faculty of Natural Sciences, Budapest University of Technology and Economics
existing infrastructures by the transmission in the so-called O, E, S, and U optical bands. However, it requires a substantial advance in efficient optical amplifiers for these spectral bands, similar to a major breakthrough in telecommunications made by the development of Er-doped fibre amplifiers.Here we report a concept of a novel hybrid bismuth-doped fibre and neodymium-doped fiber amplifier with high optical gain and extended bandwidth of operation in the E-band. The developed amplifier features a maximum gain of 43 dB and a minimal noise figure of 5.5 dB enabled by 150-m Bi-doped fibre length and 2x7m Nd 3+-doped fibre. The performance demonstrates a high potential of combining both NDFA and BDFA.
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