Laurens Bogaert

Laurens Bogaert
Ghent University | UGhent · Department of Information technology

Doctor of Engineering

About

27
Publications
2,952
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
135
Citations
Introduction
Laurens Bogaert received a PhD in electrical engineering from Ghent University-imec, Belgium in 2020 and a M.Sc. degree in electrical engineering from Ghent University, Belgium in 2015. From 2020 on, he is working as a postdoc at the Photonics Research Group, Department of Information Technology (INTEC), Ghent University-imec, Belgium. His current research interests include III/V-on-Silicon transfer printing and opto-electronic co-integration for radio-over-fiber links.

Publications

Publications (27)
Article
Full-text available
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 and virtual reality, and cyber-physical systems in Industry 4.0. The mmWave frequency band (30-300 GHz) provides the required bandwidths,...
Conference Paper
Next-generation mobile networks will use mmWave frequencies as part of their strategy to meet the ever increasing wireless data rate demands. To mitigate the challenging propagation characteristics at these high frequencies, beamforming will be key. In this paper, we discuss a true time delay optical beamforming network (OBFN) based on switchable o...
Article
We present a low-power all-digital radio-over-fiber (RoF) transmitter for the 28 GHz band using sigma-delta modulation. Using a parallel electro-absorption modulator (EAM) structure, the radio signal upconversion is split between the electrical and the optical domains. This halves the maximum bandwidth requirement of the driver circuit with respect...
Article
Silicon photonics is a key-enabling technology lever-aging decades of effort and infrastructure of the microelectronics CMOS industry resulting in high yield, low cost and potential high volume manufacturing. Furthermore, due to the high index contrast of the platform, very compact, high-complexity photonic integrated circuits can be devised. To be...
Article
Exploring mmWave frequencies and adopting small-cell architectures are two key enablers for increased wireless data rates. To make these evolutions economically viable, centralized architectures based on radio-over-fiber (RoF) are devised. To reduce the complexity of the cellular network even further, RF-over-Fiber transmission schemes are adopted...
Conference Paper
Full-text available
We demonstrate a 28 GHz radio-over-fiber system with laser-less, low-cost active antenna units using silicon photonics and a GaAs driver and LNA. 7-Gb/s downlink and uplink throughput was achieved over 2km SSMF and 5m wireless.
Article
Migrating toward higher frequencies and densification of the communication cells are two key enablers for increased wireless data rates. To make these trends economically viable, centralized architectures based on radio-over-fiber (RoF) are explored. This paper describes the design of a photoreceiver that can be applied at the remote radio head in...
Conference Paper
Full-text available
We present a low-power all-digital radio-over-fiber transmitter for beyond 28-GHz using sigma-delta modulation, a 140mW NRZ driver and parallel electro-absorption modulators. 5.25Gb/s (2.625Gb/s) 64-QAM is transported over 10-km SSMF at 1560nm with 7.6% (5.2%) EVM.
Conference Paper
Full-text available
We discuss a quadrature modulator for remote radio heads allowing full duplex operation when used in combination with a 90 degree radio-frequency (RF) hybrid coupler. The same circuit can also be used as an optical single-sideband (OSSB) modulator by feeding the two electro-absorption modulators (EAMs) with identical signals and tuning the heaters...
Conference Paper
We present an integrated PAM-4 transmitter consisting of two parallel GeSi electro-absorption modulators wirebonded to a SiGe BiCMOS driver, consuming 160mW excluding laser. 53GBd PAM-4 transmission is demonstrated over more than 1km fiber and 2km non-zero dispersion-shifted fiber, without using equalization or digital signal processing.
Conference Paper
Full-text available
The presented narrowband photoreceiver, optimized for a 27.5-29.5 GHz Analog-RoF link, is based on a 3-stage GaAs narrowband low noise amplifier which offers 24.4-dB gain, 2.1-dB noise figure and 26.6-dBm OIP3. An rms-EVM of 2.46/3.47% is achieved for 100/400-MBaud 16-QAM over the 24.25-29.5 GHz band.
Article
Full-text available
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 the digital signal processing as far as possible int...
Article
Full-text available
A novel hybrid integration strategy for compact, broadband and highly efficient mmWave on-chip antennas is demonstrated by realizing a hybrid on-chip antenna, operating in the [27.5-29.5] GHz band. A cavity-backed stacked patch antenna is implemented on a 600 μm-thick silicon substrate by using air-filled substrate-integrated-waveguide technology....
Conference Paper
Full-text available
High data rate transceivers typically consist of a system with hybrid integration of the electronics and photonics. Impedance levels provided by the opto-electronic device are often not the same as the levels desired by the electronic circuit. This mismatch introduces suboptimal operation and can even be detrimental for the overall system performan...
Article
Full-text available
An advanced transmit remote opto-antenna unit is proposed that accomplishes impedance matching between a photodetector and a low-profile antenna in a specified frequency bandwidth, without requiring an area-consuming matching network. This results in a highly compact design, which also avoids the losses and spurious radiation by such an electricall...
Conference Paper
Full-text available
We present the first real-time 100-GS/s FPGA-based sigma-delta modulator to enable all-digital radio-over-fiber transmission in the 22.75-27.5GHz band. 4.68Gb/s (2.34Gb/s) 64-QAM is transported over 10-km SSMF at 1562nm with 6.46% (4.73%) EVM.
Article
Full-text available
Next-generation wireless communication will require increasingly faster data links. To achieve those higher data rates, the shift towards mmWave frequencies and smaller cell sizes will play a major role. Radio-over-Fiber has been proposed as a possible architecture to allow for this shift but is nowadays typically implemented digitally, as CPRI (Co...
Conference Paper
Full-text available
We demonstrate a very low-cost low-power solution for a short-reach optical-wireless downlink consisting of sigma-delta radio-over-fiber and a fully passive opto-antenna. An FPGA-based prototype, performing sigma-delta modulation at 7-GS/s and covering a wide frequency band from 3.3 to 3.7 GHz, achieves 218.75 MBd 64-QAM over 200 m OM4 multi-mode f...
Conference Paper
Full-text available
A 4-lane proof-of-concept real-time sigma-delta-over-fiber system targeting 5G C-RAN downlink is demonstrated using off-the-shelf components. Per lane, an EVM of 2.67% is achieved for a 3.5 Gbps 256-QAM signal modulated at 3.5 GHz over 20-km single-mode fiber at 1310 nm.
Article
Analog radio-over-fiber transceivers allow a substantial reduction in the complexity of the remote radio heads in the wireless network of the future. In this paper we discuss the building blocks for such a transceiver implemented on a silicon photonics platform, with the heterogeneous integration of III-V devices and the co-integration with electro...
Article
Full-text available
A novel remote antenna unit, intended for application in the downlink of an analog radio frequency over fiber system, is proposed, whose radiated power originates entirely from the optical signal supplied by a single multi-mode fiber. By operating the photodetector of the optical receiver at zero bias voltage, while omitting typical active componen...
Conference Paper
Full-text available
Photodetectors suffer from a limited maximum RF output power. To boost the maximum photodetector RF output power while maintaining a high bandwidth, we designed traveling wave photodetectors (TWPDs) integrated on a silicon photonics platform. By carefully matching the delay in the optical and electrical domain, constructive addition maximizes the o...
Article
Full-text available
Future wireless communication links will require ever decreasing cell sizes to provide massive data capacity densities. Implementing a fully operational base station in each cell is not viable and thus centralized solutions making use of radio-over-fiber (RoF) have been proposed. Transimpedance amplifiers (TIAs) are an essential component in such R...

Network

Cited By

Projects

Project (1)
Project
How can we provide fibre-like connectivity to moving objects (robots, humans) with the following characteristics: very high dedicated bitrate of 100 Gb/s per object, very low latency of <10 μs, very high reliability of 99.999%, very high density of more than one object per m2 and this at low power consumption? ERC Advanced Grant ATTO project (No.695495).