Poster Session Abstracts
Weight Clustering for Simplified Time-Domain Chromatic Dispersion Mitigation in Optical Fiber Communications Geraldo Gomes, Pedro J. Freire, Jaroslaw E. Prilepsky, Sergei K. Turitsyn, Aston University This study explores weight clustering to reduce standard single-mode fiber (SSMF) at 32Gbd. Simulations show that the integration of time domain-based CDC and weight clustering effectively reduces the number of required filter taps, with a plus finding that as the power and nonlinearity increase, fewer clustered filter taps are needed for CDC, leading to reduced processing complexity. This counter-intuitive finding can be attributed to the interplay between anomalous dispersion and nonlinear self-phase modulation in SSMF and can be leveraged to simplify CDC complexity and free up hardware resources for other equalizers in digital coherent receivers. chromatic dispersion compensation (CDC) complexity in optical fiber links, focusing on a 16-QAM transmission across 1280km of
simulated in an end-to-end configuration in an optical design software Code V, aiming to address the key requirements of a classical switching task in DCNs. This research also plans to manufacture an error-tolerant prototype, and experimentally explore its operational limits in a variety of computing technologies.
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Photonic Reservoir Computing for Kramers-Kronig Receiver Linearization Sarah Masaad and Peter Bienstman,
Photonics Research Group, Department of Information Technology, Ghent University – imec, Belgium We numerically demonstrate the use of a photonic reservoir co-trained with an electronic feed forward equalizer (FFE) for the linearization
of a Kramers-Kronig (KK) receiver operating at restricted sampling rate and low carrier powers. The KK receiver is operated at 3 samples per symbol instead of the required 6, and using carrier-to-signal power ratios between 5 and 8 dB instead of the required 9 dB. This causes the receiver to behave nonlinearly, thus distorting the signal post- detection and limiting the successfulness of the necessary digital signal processing (DSP) blocks like chromatic dispersion compensation. Our proposed reservoir-FFE network sandwiches the receiver and is trained to improve its linearity. The network is trained on back-to-back systems and then tested in a plug-and-play manner in varying short- reach links. Numerical results show successful linearization with up to 4 times reduction in bit error rate. ©2023 The Author(s).
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Ultrawideband (21.9 THz) Ytterbium Doped Fibre Amplifiers for 1 µm Data Transmission Xin Huang, Sijing Liang, Lin Xu, David J.
Richardson, Yongmin Jung, Optoelectronics Research Centre, University of Southampton Ytterbium-doped fibre amplifiers (YDFAs) are renowned for their broad emission bandwidth, but the focus on designing wideband YDFAs tailored specifically for data transmission has been limited,
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owing to the challenges posed by relatively high propagation losses in conventional silica fibres. Recent breakthroughs, highlighted by the development of a record low-loss hollow core fibre operating at 1 µm (0.3 dB/km @1060 nm), have opened new possibilities for 1 µm data transmission. This study introduces an innovative ultrawideband ytterbium-doped fibre amplifier particularly engineered for optimal performance in 1 µm data transmission. The amplifier showcases an impressive 21.9 THz bandwidth spanning from 1025 to 1110 nm, featuring an >20 dB average gain coupled with a <5.1 dB noise figure. This advancement marks a significant step towards unlocking the full potential of ytterbium-doped fibres in high-speed, long-distance data transmission applications.
Direct Laser Diode Interconnection with a Hollow Core Fibre Jing Meng, Sijing Liang, Qiang Fu, Ian A. Davidson, Hesham Sakr, Gregory Jaison, Natalie Wheeler, Francesco Poletti, David J. Richardson, Yongmin Jung, Optoelectronics Research Centre, University of Southampton – without the need for an intermediate solid core fibre – is a very important requirement for fully leveraging the unique characteristics of HCFs, such as low-loss, low-latency, low dispersion and low nonlinearity. This study explores two specific methods for HCF interconnection – butt coupling and a two-lens system. Using an 850 nm VCSEL, butt coupling achieved an efficiency of ~69%, while the two-lens system demonstrated an outstanding ~96% efficiency, accompanied by superior beam quality. Extending our investigation to mid-IR QCL sources, we achieved an efficiency of ~70%. These findings highlight the versatility and efficiency of HCF interconnection methods across diverse laser sources, promising enhanced performance in optical communication systems. Direct interconnection of a laser diode or photodiode with a hollow-core fibre (HCF)
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Within microseconds: An ultra-fast, low-loss and non- blocking free space optical switch based on a piezo- actuator and a multi-lens beam-steering system Yanwu Liu, George Zervas, UCL
Conventional data centre networks (DCNs) with multi-layer switching structures are inherently limited by oversubscription, hotspots, congestions and cabling complexities. All optical circuit switching in free space (FSO) provides a potential solution to reconfigure the scalability of a DCN
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and serve as a dynamic interface between multiple processing blocks. However, commercial switches such as POLATIS Series 7000 are limited by the mechanical switching speed of milliseconds. In this research, an ultra-fast (around 1.5 us), low-loss, low-crosstalk and non- blocking (5×5) FSO switch based on a piezo-actuator and a multi-lens beam-steering system at 1550nm has been theoretically proposed and
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