A5009801995- Optical Network Technologies
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Radio Frequency Integrated Circuit Design
- Advancements in PLL and VCO Technologies
- Advanced Optical Network Technologies
- Millimeter-Wave Propagation and Modeling
- Microwave Engineering and Waveguides
- Analog and Mixed-Signal Circuit Design
- Electromagnetic Fields and Biological Effects
- Advanced MIMO Systems Optimization
- Advanced Power Amplifier Design
- Wireless Body Area Networks
- Advanced Adaptive Filtering Techniques
- Power Line Communications and Noise
- Energy Harvesting in Wireless Networks
- Indoor and Outdoor Localization Technologies
- Advanced Fiber Laser Technologies
- Full-Duplex Wireless Communications
- Digital Filter Design and Implementation
- Antenna Design and Analysis
- Electromagnetic Compatibility and Noise Suppression
- Advanced Wireless Communication Technologies
- Semiconductor Quantum Structures and Devices
Ghent University
2016-2025
IMEC
2012-2022
Ghent University Hospital
2018-2021
iMinds
2014-2017
Imec the Netherlands
2013-2016
Centro de Investigación de Métodos Computacionales
2013
Information Technology University
2011
With the continuously increasing demand of cost effective, broadband wireless access, radio-over-fiber (RoF) starts to gain more and momentum. Various techniques already exist, using analog (ARoF) or digitized (DRoF) radio signals over fiber; each with their own advantages disadvantages. By transmitting a sigma delta modulated signal fiber (SDoF), similar immunity impairments as DRoF can be obtained while maintaining low complexity ARoF. This letter describes detailed experimental comparison...
Integrated photonic systems require fast modulators to keep up with demanding operation speeds and increasing data rates. The silicon nitride integrated platform is of particular interest for applications such as datacom, light detection ranging (LIDAR), quantum photonics, computing owing its low losses CMOS compatibility. Yet, this inherently lacks high-speed modulators. Heterogeneous integration lithium niobate on waveguides can address drawback strong Pockels effect. We demonstrate the...
A cost-effective, compact, and high-performance antenna element for beamforming applications in all fifth-generation (5G) New Radio bands the [24.25–29.5] <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$ \,$</tex-math></inline-formula> GHz spectrum is proposed this letter. The novel topology adopts a square patch, an edge-plated air-filled cavity, hourglass-shaped aperture-coupled feed to achieve very high...
Beyond-5G wireless systems require significant improvement to enable the Internet of Everything, offering ultra-reliability, ultra-low-latency and high data-rates for holographic telepresence, immersive augmented virtual reality, cyber-physical in Industry 4.0. The mmWave frequency band (30–300 GHz) provides required bandwidths, but very challenging propagation conditions exist. Conventional co-located multi-antenna counter higher path loss, are insufficient real-life scenarios with frequent...
Transceivers based on electroabsorption modulators (EAM) are considered as a promising candidate for the next generation 400 GbE short-reach optical networks. They capable of combining high bandwidth and low-power operation with very compact layout, removing need traveling wave electrodes dedicated 50 Ω termination. In this paper, we demonstrate first silicon-based EAM, in combination an in-house developed SiGe BiCMOS transceiver chipset, transmitting single-lane 100 Gb/s non-return-to-zero...
All-digital radio-over-fiber (RoF) transmission has attracted a significant amount of interest in digital-centric systems or centralized networks because it greatly simplifies the front-end hardware by using digital processing. The sigma-delta modulator (SDM)-based all-digital RoF approach pushes signal processing as far possible into transmit chain. We present real-time 100-GS/s fourth-order single-bit SDM for high-frequency band without aid analog/optical up-conversion. This is fastest...
In-band full-duplex (FD) wireless communication allows the simultaneous transmission and reception of data at same frequency band, effectively doubling spectral efficiency rate while reducing latency. Previously published designs mostly target self-interference (SI) cancellation in conventional systems. In this paper, we focus on real-time SI for short-reach FD The superior signal quality a point-to-point system, utilization wideband communications to achieve high throughput. Besides, such...
Four-level pulse amplitude modulation (PAM-4) is widely regarded as the format of choice for next generation 400 gigabit Ethernet short-reach optical transceiver. However, generating and receiving PAM-4 at line rates 112 Gb/s has proven challenging, without relying on power-hungry tools digital signal processing digital-to-analog converters, it requires linearity from E/O-components in link and/or predistortion techniques. Moving binary to multilevel conversion domain would greatly relax...
This paper presents a numerical approach for massive multiple-input multiple-output (MIMO) human exposure assessment. It combines ray-tracing the estimation of wireless channel and finite-difference time-domain method to simulate realistic phantom. We apply it estimate in model an industrial indoor environment with single MIMO base station (BS). The scenarios include line-of-sight non-line-of-sight propagation BS using equal gain transmission precoding at 3.5 GHz. Calculated parameters are...
Recent advances in deep neural networks (DNNs) have significantly improved various audio processing applications, including speech enhancement, synthesis, and hearing aid algorithms. DNN-based closed-loop systems gained popularity these applications due to their robust performance ability adapt diverse conditions. Despite effectiveness, current often suffer from sound quality degradation caused by artifacts introduced suboptimal sampling methods. To address this challenge, we introduce...
A functional demonstration of bit-interleaving TDM downstream protocol for passive optical networks (Bi-PON) is reported. The proposed presents a significant reduction in dynamic power consumption the customer premise equipment over conventional protocol. It allows to select relevant bits all aggregated incoming data immediately after clock and recovery (CDR) and, hence, subsequent hardware run at much lower user rate. Comparison experimental results FPGA-based implementations Bi-PON XG-PON...
A BiCMOS chip-based real-time intensity modulation/direct detection spatial division multiplexing system is experimentally demonstrated for both optical interconnects. 100 Gbps/λ/core electrical duobinary (EDB) transmission over 1 km 7-core multicore fiber (MCF) carried out, achieving KP4 forward error correction (FEC) limit (BER < 2E-4). Using dispersion compensation, 7 × of non-return-to-zero (NRZ) and EDB signals 10 MCF achieved with BER lower than 7% overhead hard-decision FEC 3.8E-3)....
A new high-speed delta-sigma modulator (DSM) topology is proposed by cascading a bit reduction process with multi-stage noise shaping MASH-1-1 DSM. This converts the two-bit output sequence of DSM to single-bit sequence, merely compromising noise-shaping performance. Furthermore, high clock frequency requirements are significantly relaxed using parallel processing. facilitates designs wideband software defined radio transmitters and radio-over-fiber transmitters. Experimental results FPGA...
The fifth generation (5G) cellular network is expected to include the millimeter wave spectrum, increase base station density, and employ higher-order multiple-antenna technologies. centralized radio access architectures combined with radio-over-fiber (RoF) links can be key enabler improve fronthaul networks. sigma-delta modulated signal over fiber (SDoF) architecture has been proposed as a solution leveraging benefits of both digitized analog RoF. This work proposes novel distributed...
This paper gives a tutorial overview on high speed burst-mode receiver (BM-RX) requirements, specific for time division multiplexing passive optical networks, and design issues of such BM-RXs as well their advanced techniques. It focuses how to with short burst overhead fast synchronization. We present principles circuit architectures various types transimpedance amplifiers, limiting amplifiers clock data recovery circuits. The recent development 10 Gb/s is highlighted also including...
We demonstrate the first real-time, serial 100 Gb/s NRZ-OOK transmission with an integrated GeSi EAM implemented on a silicon photonics platform. Transmission over 500m of SSMF and 2 km dispersion shifted fiber is presented.
To achieve the massive device connectivity and high data rate demanded by 5G, wireless transmission with wider signal bandwidths higher-order multiple-input multiple-output (MIMO) is inevitable. This work demonstrates a possible function split option for next generation fronthaul interface (NGFI). The proof-of-concept downlink architecture consists of real-time sigma-delta modulated over fiber (SDoF) links in combination distributed multi-user (MU) MIMO transmission. setup fully implemented...
The article describes a numerical approach for Massive MIMO channel modeling that accounts the effects of electromagnetic coupling between user and receiving device. is performed by combination Finite-Difference Time-Domain Ray-Tracing methods, supplemented with stochastic geometry model propagation environment. influence user-coupling on properties was studied statistically using singular value spread matrix power ratio metrics correlation matrix. time-averaged Poynting vector distribution...
In this brief, the losses in Class-E power amplifiers (PAs) with finite dc-feed inductance are analyzed. This analysis results practical analytical expressions, which significantly simplify design and optimization of PAs. To demonstrate their applicability, a state-of-the-art 2.45-GHz differential cascode PA 0.18- CMOS on-chip inductor is presented. By proposed combination dynamic supply voltage bias voltage, high drain efficiency achieved over wide control range, covering from 2.2 up to 20...
The need of a wireless network with very low latency, high bandwidth, and cellular density is paramount for serving futuristic applications. For this purpose, we design dense network, consisting radio cells less than 10 m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . To serve these small cells, backbone implemented over radio-over-fibre (RoF) based architecture can be an ideal solution. In paper propose different RoF architectures...