Channel Measurements and Modeling for Low Terahertz Communications in an Aircraft Cabin
T. Doeker, J. M. Eckhardt and T. Kürner
in IEEE Transactions on Antennas and Propagation, vol. 70, no. 11, pp. 10903-10916, Nov. 2022.
https://doi.org/10.1109/TAP.2022.3191218 
High-Bandwidth Coherent OFDM-Nyquist-TDM Transceiver With Low-Bandwidth Electronics
Y. Mandalawi, K. Singh, M. I. Hosni, J. Meier and T. Schneider
in IEEE Access, vol. 11, pp. 58244-58253, 2023, doi: 10.1109/ACCESS.2023.3284683
Analysis of Bandwidth Reduction and Resolution Improvement for Photonics-Assisted ADC
Y. Mandalawi, J. Meier, K. Singh, M. I. Hosni, S. De and T. Schneider
in Journal of Lightwave Technology, doi: 10.1109/JLT.2023.3279876
Low-Bandwidth Photonics-Assisted Receiver for Broad-Bandwidth Wireless Signals
M. I. Hosni, Y. Mandalawi, J. Meier, K. Singh, A. M. Mokhtar and T. Schneider
in IEEE Access, vol. 11, pp. 44260-44266, 2023, doi: 10.1109/ACCESS.2023.3272116 .
Wide-Bandwidth, Enhanced-Quality Wireless Signal Detection with Low-Bandwidth Devices
M. I. Hosni, J. Meier, Y. Mandalawi, K. Singh, P. Mandal, E. Baidoo, A. M. Mokhtar and T. Schneider
2023 Optical Fiber Communications Conference and Exhibition (OFC), San Diego, CA, USA, 2023, pp. 1-3, doi: 10.1364/OFC.2023.M1J.3 .
Compact Agnostic Nyquist WDM Transmission System Based on Cascaded Silicon Ring Modulators
M. I. Hosni, K. Singh, Y. Mandalawi, T. Schneider and A. M. Mokhtar
2022 Asia Communications and Photonics Conference (ACP), Shenzhen, China, 2022, pp. 526-529, doi: 10.1109/ACP55869.2022.10088523 .
Thermal isolation of silicon ring modulators in densely packed photonic integrated circuits
Souvaraj De, Ranjan Das, Karanveer Singh, Younus Mandalawi, Thomas Kleine-Ostmann and Thomas Schneider Proc. SPIE 12575, Integrated Optics: Design, Devices, Systems and Applications VII, 125750C (May 31, 2023)
https://doi.org/10.1117/12.2665595
Reconfigurable RF Frequency Sniffer Using Tunable Micro Ring Resonator
K. Singh, R. Das, A. Misra, S. De, M. I. Hosni, A. Venugopalan, L. Zhou, and T. Schneider
in CLEO 2023, Technical Digest Series (Optica Publishing Group, 2023), paper SW3O.5.
Thermal Crosstalk Alleviated Silicon Microring Switches
Rebecca Cubas Heim, Souvaraj De, Ranjan Das, Karanveer Singh, Thomas Kleine-Ostmann and Thomas Schneider
in CLEO Europe Conference, Munich, 2023 (Accepted).
Amorphous Silicon based Crosstalk Resilient Photonic Phase Shifters
Souvaraj De, Ranjan Das, Karanveer Singh, Younus Mandalawi, Thomas Kleine-Ostmann and Thomas Schneider
in CLEO Europe Conference, Munich, 2023 (Accepted).
Thermal Crosstalk resistant, integrated Uni-Traveling Carrier Photodetector
Souvaraj De, Ranjan Das, Karanveer Singh, Younus Mandalawi, Evans Baidoo, Thomas Kleine-Ostmann and Thomas Schneider
in IRMMW-THz, Montreal, Canada 2023 (Accepted)
Real-time reconfigurable on-chip photonic frequency decoder
Karanveer Singh, Ranjan Das, Abhinand Venugopalan, Souvaraj De, Mohamed I. Hosni, Linjie Zhou, and Thomas Schneider
Opt. Express 31, 30160-30170 (2023).
Sensitivity Analysis of a 280 – 312 GHz Superheterodyne Terahertz Link Targeting IEEE802.15.3d Applications
D. Wrana, L. John, B. Schoch, S. Wagner, and I. Kallfass
IEEE Transactions on Terahertz Science and Technology
https://doi.org/10.1109/TTHZ.2022.3172008
Measurements at 300 GHz in Eavesdropping Scenarios and First Results
C. Herold, T. Doeker, and T. Kürner
accepted for publication – 5th International Workshop on Mobile Terahertz Systems (IWMTS) 2022, 4. – 6. July 2022
https://doi.org/10.1109/IWMTS54901.2022.9832458
Investigation of Eavesdropping Opportunities in a Meeting Room Scenario for THz Communications
C. Herold, T. Doeker, J. Eckhardt, and T. Kürner
16th European Conference on Antennas and Propagation (EuCAP) 2022, 27. Mar. – 1. Apr. 2022
https://doi.org/10.23919/EuCAP53622.2022.9769432
RemEduLa – Remote Education Laboratory for FPGA Design Technology
C. Blochwitz, P. Grothe, S. Dreier, W. Aljnabi, R. Butchy, and M. Berekovic
International Symposium for Circuits and Systems (ISCAS) 2022, 28. May – 1. June 2022
https://doi.org/10.1109/ISCAS48785.2022.9937666
Physical Layer Security for THz-Communication
C. Herold, T. Doeker, and T. Kürner
accepted for publication – 10th International Workshop on Terahertz Technology and Applications, 31. May – 1. June 2022
Characterization of the Dielectric Properties of Building Materials for the Design of THz communication Channels
F. Taleb, G. Hernandez-Cardoso, E. Castro-Camus, and M. Koch
accepted for publication – 10th International Workshop on Terahertz Technology and Applications, 31. May – 1. June 2022
The Effect of the Complex Geometries of Building Materials on Scattering Properties for the Design of THz Communication Channels
F. Taleb et al.
accepted for publication – 9th International Conference on Optical Terahertz Science and Technology (OTST) 2022, 19. – 24. June 2022
THz Communications: Paving the way towards wireless Tbps
ed. T. Kürner, D. Mittleman, and T. Nagatsuma – Springer 2022
several chapter by D. Humphreys, T. Kleine Ostmann, T. Schneider, M. Berekovic, M. Koch, I. Kallfass, and A. Jukan
Influence of Channel Impulse Response Characteristics on Wireless THz-Communications
C. Herold, T. Doeker, and T. Kürner
47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) 2022, 28. Aug. – 2. Sept. 2022
https://doi.org/10.1109/IRMMW-THz50927.2022.9895523
Impact of thermal crosstalk in Avalanche Photodetectors in THz domain
S. De, R. Das, K. Singh, Y. Mandalawi, T. Kleine-Ostmann, and T. Schneider
47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) 2022, 28. Aug. – 2. Sept. 2022
https://doi.org/10.1109/IRMMW-THz50927.2022.9896045
THz Channel Sounder and VNA Verification Measurement Based Over-The-Air Multipath Artifact
M. Al-Dabbagh, T. Doeker, T. Kleine-Ostmann, T. Kürner, and D. Humphreys
47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) 2022, 28. Aug. – 2. Sept. 2022
https://doi.org/10.1109/IRMMW-THz50927.2022.9895510
Investigation of the Influence of LO Leakage in an E-Band Quadrature Transmitter
D. Wrana, B. Schoch, L. Manoliu, S. Haußmann, A. Tessmann, and I.Kallfass
2022 German Microwave Conference (GeMIC), 2022.
Performance Optimization of an E-Band Communication Link using Open-Loop Predistortion
B. Schoch, F. Wiewel, D. Wrana, L. Manoliu, S. Haussmann, and I. Kallfass
2022 German Microwave Conference (GeMIC), 2022.
Short Range Wireless Transmission Using a 295–315 GHz Superheterodyne Link Targeting IEEE802.15.3d Applications
D. Wrana, L. John, B. Schoch, S. Wagner, and I. Kallfass
2021 European Microwave Week (EuMW), 2022
https://doi.org/10.23919/EuMC50147.2022.9784217
Temperature insensitive Avalanche Photodetectors
S. De, R. Das, K. Singh, Y. Mandalawi, T. Kleine-Ostmann, T. Schneider
OSA Advanced Photonics Congress, 24th – 28th July, 2022.
High-Bandwidth Signal Reception with Improved ENOB by Frequency-Time Coherence Photonic Sampling
Y. Mandalawi, J. Meier, K. Singh, M. I. Hosni, S. De, S. Preussler, T. Schneider
OSA Advanced Photonics Congress, 24th – 28th July, 2022.
High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics
J. Meier, K. Singh, A. Misra, S. Preußler, J. C. Schyett, and T. Schneider
IEEE Photonics Journal IEEE Photonics Journal 14 (2), 1-7 (2022).
Reconfigurable and real-time high-bandwidth Nyquist signal detection with low-bandwidth in silicon photonics.
Misra, C. Kress, K. Singh, J. Meier, T. Schwabe, S. Preußler, J. C. Scheytt, and T. Schneider
Optics Express, 30 (8), 13776-13789 (2022).
High-Bandwidth Signal Reception with Improved ENOB by Photonics Samplings.
Y. Mandalawi, J. Meier, K. Singh, A. Misra, S. Preußler, and T. Schneider
3rd URSI Atlantic / Asia-Pacific Radio Science Meeting – 2022.
Thermal Crosstalk analysis of dual-drive push-pull Mach-Zehnder modulator and photodetectors for THz communication systems
S. De, R. Das, T. Kleine-Ostmann, and T. Schneider
3rd URSI Atlantic / Asia-Pacific Radio Science Meeting – 2022.
Verification of THz Channel Sounder and Delay Estimation with Over-The-Air Multipath Artefact
D. Dupleich, S. Semper, M. Al-Dabbagh, A. Ebert, T. Kleine-Ostmann, and R. Thoma
16th European Conference on Antennas and Propagation (EuCAP) 2022, 27. Mar. – 1. Apr. 2022
Benchmarking Machine Learning Techniques for THz Channel Estimation Problems
M. Bensalem and A. Jukan
45th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), Opatija, 2022
https://doi.org/10.48550/arXiv.2104.08122
Performance Analysis of MDPC and RS codes in Two-channel THz Communication Systems
C.V. Phung, C. Herold, D. Humphreys, T. Kurner and A. Jukan
accepted for 45th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), Opatija, 2022
Short-Range Full-Duplex Real-Time Wireless Terahertz Link for IEEE802.15.3d Applications
D. Wrana, Y. Leiba, L. John, B. Schoch, A. Tessmann and I. Kallfass
IEEE Radio and Wireless Symposium (RWS) 2022, 16. – 19. Jan. 2022
Influence of the Initial Antenna Orientation on the Performance of Compressed Sensing-assisted Device Discovery
T. Doeker and T. Kürner
Kleinheubach Conference 2021, 28. – 30. Sep. 2021
Radiative Reference Plane Estimation and Uncertainty for THz Path Loss Measurements
M. Al-Dabbagh, T. Kleine-Ostmann and D. Humphreys
46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) 2021, 29. Aug. – 3. Sep. 2021
https://doi.org/10.1109/IRMMW-THz50926.2021.9567147
A 2-20-GHz ultralow phase noise signal source using a microwave oscillator locked to a mode-locked laser
M- Bahmanian and C. Scheytt
IEEE Transactions on Microwave Theory and Techniques, vol. 69, no. 3, 2021
Impact of the local oscillator on high-bandwidth millimeter-wave communication signals
U. Schumann, N. Meyne, and T. Kleine-Ostmann
46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) 2021, 29- Aug. – 3. Sept. 2021
StreamGrid-An AXI-Stream-Compliant Overlay Architecture
C. Blochwitz, L. Philipp, M. Berekovic, and T. Pionteck
International Symposium on Applied Reconfigurable Computing (ARC) 2021, 29. June – 1. July 2021
Development of Calibration Techniques and Traceability of the Measured Variables in THz Wireless Channel
M. Al-Dabbagh, D. Humphreys, T. Kleine-Ostmann, R. Thomä
15th European Conference on Antennas and Propagation (EuCAP) 2021, 27. Mar. – 1. Apr. 2021
Modular Link Level Simulator for the Physical Layer of Beyond 5G Wireless Communication Systems.
Eckhardt, J. M., Herold, C., Jung, B. K., Dreyer, N., & Kürner, T.
Radio Science, 57, 2022, e2021RS007395.
https://doi.org/10.1029/2021RS007395
Link Level Simulations of the Physical Layer for Low THz Communication Systems: Validation and Analysis of a Data Center Use Case.
J. M. Eckhardt, C. Herold, B.K. Jung, N. Dreyer, T. Kürner
https://doi.org/10.24355/dbbs.084-202111032122-0
Photonic Arbitrary Waveform Generation With Three Times the Sampling Rate of the Modulator Bandwidth
K. Singh, J. Meier, A. Misra, S. Preußler, J. C. Scheytt and T. Schneider
IEEE Photonics Technology Letters, vol. 32, no. 24 – Dec. 2020
Low Bandwidth Detection of High Data Rate Nyquist Signals
J. Meier, A. Misra, S. Preußler, and T. Schneider
OSA Advanced Photonics Congress 2021, 26. – 30. Jul. 2021
Agnostic sampling transceiver
A. Misra, J. Meier, S. Preussler, K. Singh, and T. Schneider
Optics Express 29, 2021
https://doi.org/10.1364/OE.425548
Roll-Off Factor Analysis of Optical Nyquist Pulses Generated by an On-Chip Mach-Zehnder Modulator
S. De, K. Singh, C. Kress, R. Das, T. Schwabe, S. Preussler, T. Kleine-Ostmann, J. C. Schyett and T. Schneider
IEEE Photonics Technology Letters, vol. 33, no.21 – Nov. 2021
https://doi.org/10.1109/LPT.2021.3112485
High Modulation Efficiency Segmented Mach-Zehnder Modulator Monolithically Integrated with Linear Driver in 0.25 um BiCMOS Technology
C. Kress, K. Singh, T. Schwabe, S. Preussler, T. Schneider, and C. Scheytt
OSA Advanced Photonics Congress 2021, 26. – 30. July 2022
Optically clocked switched-emitter-follower THA in a photonic SiGe BiCMOS technology
M. Weizel, C. Scheytt, F. Kärtner, and J. Witzens
Optical Express 29, 2021
https://doi.org/10.1364/OE.425710
Modulator-based sinc-sequence sampled time and frequency multiplexed QAM signal transmission
A. Misra, J. Meier, S. Preussler, K. Singh, and T. Schneider
IEEE Photonics Conference (IPC) 2021, 18. – 21. Oct. 2021
https://doi.org/10.1109/IPC48725.2021.9593044
Verification of Dual-Polarized Ultra-Wideband Channel Sounder for THz Applications
D. Dupleich, A. Ebert, R. Müller, G. Del Galdo and R. Thomä
32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2021, 13. – 16. Sept. 2021
Practical Aspects on the Noise Floor Estimation and Cut-off Margin in Channel Sounding Applications
D. Dupleich, R. Müller and R. Thomä
15th European Conference on Antennas and Propagation (EuCAP) 2021, 27. Mar. – 1. Apr. 2021
https://doi.org/10.23919/EuCAP51087.2021.9411409
Angle of Arrival and Angle of Departure Estimation Using Compressed Sensing for Terahertz Communications
T. Doeker, P. Reddy Samala, P. S. Negi, A. Rajwade and T. Kürner
15th European Conference on Antennas and Propagation (EuCAP) 2021, 27. Mar. – 1. Apr. 2021
https://doi.org/10.23919/EuCAP51087.2021.9411406
Athermal Travelling Wave Mach-Zehnder Modulator for Optical Interconnects
S. De, R.Das, T. Kleine-Ostmann and T. Schneider
OSA Advanced Photoncics Congress, 26. – 30. Jul. 2021
On-chip Inductive Peaking to Boost the Silicon Modulator Bandwidth
R. Das, S. De and T. Schneider
OSA Advanced Photonics Congress, 26 – 30 Jul. 2021
Characterization of non-idealities in optical Nyquist pulses for THz signal sampling metrology
S. De, R. Das, T. Kleine-Ostmann and T. Schneider
46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2021), 29. Aug. – 03. Sept. 2021
https://doi.org/10.1109/IRMMW-THz50926.2021.9567411
Effect of Thermal Crosstalk on Travelling-Wave Mach-Zehnder Modulator
S. De, R. Das, T. Kleine-Ostmann and T. Schneider
Conference on Lasers and Electro-Optics (CLEO) Europe, 20 – 24 June 2021
Sampling of a periodic pulse train by a modulator in a ring resonator
J. Meier, A. Misra, S. Preussler, and T. Schneider
SPIE Conference 11713, 5. Mar. 2021
Analysis of Non-idealities in the Generation of Reconfigurable Sinc-shaped Optical Nyquist Pulses
S. De, A. Misra, R. Das, T. Kleine-Ostmann and T. Schneider
IEEE Access
https://doi.org/10.1109/ACCESS.2021.3082847
CMOS-compatible Photonic Phase Shifters with Extremely Low Thermal Crosstalk Performance
S. De, R. Das, R. K. Varshney and T. Schneider
Journal of Lightwave Technology, 2020
https://doi.org/10.1109/JLT.2020.3043631
Photonic Analog-to-Digital-Converters – Comparison of a MZM-Sampler with an Optoelectronic Switched-Emitter-Follower Sampler
M. Weizel, F. Kärtner, J. Witzens, and C. Scheytt
Photonics Networks – 21th ITG-Symposium, 24. – 25. Nov. 2020
Above 60 GHz Bandwidth 10 GS/s Sampling Rate Track-and-Hold Amplifier in 130 nm SiGe BiCMOS Technology
L. Wu, M. Weizel, and C. Scheytt
IEEE International Symposium on Circuits and Systems (ISCAS) 2020, 12. – 14. Nov. 2020
https://doi.org/10.1109/ISCAS45731.2020.9180947
Integrated group delay units for real-time reconfigurable spectrum sensing of mm-wave signals
R. Das and T. Schneider
OSA Optics Letters, vol. 45, issue 17 – Sept. 2020
https://doi.org/10.1364/OL.396038
Forscher entwickeln Messsysteme zur THz-Kommunikation
A. Jukan, T. Kleine-Ostmann, T. Kürner and T. Schneider
IQ Journal, 4/2020 Pioniere für die Zukunft
Online link
Design and Simulation of Thermo-Optic Phase Shifters with Low Thermal Crosstalk for Dense Photonic Integration
S. De, R. Das, R. K. Varshney and T. Schneider
IEEE Access, 2020
https://doi.org/10.1109/ACCESS.2020.3013116
Terahertz beam steering using active diffraction grating fabricated by 3D printing
J. Seifert, G. Hernandez-Cardoso, M. Koch, and E. Castro-Camus
Optics Express 28, 2020
https://doi.org/10.1364/OE.399376
Thermal Crosstalk Resilient Integrated Optical Attenuator
S. De, R. Das, R. K. Varshney and T. Schneider
OSA Frontiers in Optics Laser Science (FiO+LS), September 2020
Photonic Sampling for the Metrology of THz Wireless Communications
R. Das and T. Schneider
9th International Wokshop on Terahertz Technology and Applications (IWTTA), March 2020
Error Correction with Systematic RLNC in Multi-Channel THz Communication Systems
C. V. Phung, A. Engelmann and A. Jukan
43rd International Convention on Information, Communication and Electronic Technology (MIPRO), October 2020
https://doi.org/10.23919/MIPRO48935.2020.9245338
Ultra Low Phase Noise and Ultra Wide-Band Frequency Synthesizer Using an Optical Clock Source
M. Bahmanian, S. Fard, B. Koppelmann and J. C. Scheytt
International Microwave Symposium (IMS), August 2020
https://doi.org/10.1109/IMS30576.2020.9224118
Ultra-Low Phase Noise Frequency Synthesis for THz Communications Using Optoelectronic PLLs
J. C. Scheytt, D. Wrana and I. Kallfass
3rd International Workshop on Mobile Terahertz Systems (IWMTS), July 2020
https://doi.org/10.1109/IWMTS49292.2020.9166347
Improving THz Quality-of-Transmission with Systematic RLNC and Auxiliary Channels
C. V. Phung, A. Engelmann, T. Kürner and A. Jukan
IEEE International Conference on Communications, June 2020
https://doi.org/10.1109/ICCWorkshops49005.2020.9145148
Integrated source-free all optical sampling with a sampling rate of up to three times the RF bandwidth of silicon photonic MZM
A. Misra, C. Kress, K. Singh, S. Preußler, J. C. Scheytt, and T. Schneider
Optics Express 27, 2019
https://doi.org/10.1364/OE.27.029972
Characterization of the Propagation Channel in Conference Room Scenario at 190 GHz
D. Dupleich, R. Müller, S. Skoblikov, M. Landmann, G. Del Galdo, and R. Thomä
14th European Conference on Antennas and Propagation (EuCAP) 2020, 15. – 20. Mar. 2020
https://doi.org/10.23919/EuCAP48036.2020.9135404
Multi-band Characterization of Propagation in Industry Scenarios
D. Dupleich, R. Müller, M. Landmann, J. Luo, G. Del Galdo, and R. Thomä
14th European Conference on Antennas and Propagation (EuCAP) 2020, 15. – 20. Mar. 2020
https://doi.org/10.23919/EuCAP48036.2020.9135630
An Overview of the Meteracom Project
D. Humphreys, M. Berekovic, I. Kallfass, J. C. Scheytt, T. Kürner, A. Jukan, T. Schneider, T. Kleine-Ostmann, M. Koch and R. Thomae
43rd Wireless World Research Forum (WWRF), October 2019
Towards Optimal Path Allocation for Unreliable Reconfigurable Intelligent Surfaces
M. Bensalem, A. Engelmann, and A. Jukan
accepted for publication at Design of Reliable Communication Networks (DRCN), February, 2023. Online Link
Increasing fault tolerance and throughput with adaptive control plane in smart factories
C. V. Phung and A. Jukan
IEEE Global Communications Conference (GLOBECOM), Rio de Janeiro, Brazil, 2022
https://doi.org/10.1109/GLOBECOM48099.2022.10001082
Temperature Insensitive Avalanche Photodetectors
S. De, R. Das, K. Singh, Y. Mandalawi, T. Kleine-Ostmann, and T. Schneider
Optica Advanced Photonics Congress 2022, paper ITu3C.2
https://doi.org/10.1364/IPRSN.2022.ITu3C.2
Study of thermal crosstalk in Avalanche Photodetectors in THz domain
S. De, R. Das, K. Singh, Y. Mandalawi, T. Kleine-Ostmann and T. Schneider
2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), Delft, Netherlands, 2022, pp. 1-2
https://doi.org/10.1109/IRMMW-THz50927.2022.9896045
Thermal crosstalk mitigation in a dual-drive Mach-Zehnder Modulator
S. De, R. Das, K. Singh, Y. Mandalawi, T. Kleine-Ostmann and T. Schneider
2022 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), Turin, Italy, 2022, pp. 27-28
https://doi.org/10.1109/NUSOD54938.2022.9894833
Thermal-aware Multi-Quantum Well Laser
S. De, R. Das, K. Singh, Y. Mandalawi, T. Kleine-Ostmann, and T. Schneider
Frontiers in Optics + Laser Science 2022 (FIO, LS), paper JTu4A.51
https://doi.org/10.1364/FIO.2022.JTu4A.51
Impact of thermal crosstalk in Integrated Photonic PN Phase Shifters
S. De, R. Das, K. Singh, Y. Mandalawi, T. Kleine-Ostmann, and T. Schneider
OWLS-16, 5-9 September 2022 Dresden, Germany
Thermal Insulation of Silicon Ring Modulators in Densely-Packed Photonic Integrated Circuits
S. De, R. Das, K. Singh, Y. Mandalawi, T. Kleine-Ostmann, T. Schneider
accepted at SPIE Optics + Optoelectronics 2023, 23 – 27 April, 2023