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2. Experimental Validation of Coherent Joint Transmission in a Distributed-MIMO System with Analog Fronthaul for 6G

Author

Puerta, Rafael, Joharifar, Mahdieh, Han, Mengyao, Djupsjöbacka, Anders, Bobrovs, Vjaceslavs, Popov, Sergei, Ozolins, Oskars, and Pang, Xiaodan

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

The sixth-generation (6G) mobile networks must increase coverage and improve spectral efficiency, especially for cell-edge users. Distributed multiple-input multiple-output (D-MIMO) networks can fulfill these requirements provided that transmission/reception points (TRxPs) of the network can be synchronized with sub nanosecond precision, however, synchronization with current backhaul and fronthaul digital interfaces is challenging. For 6G new services and scenarios, analog radio-over-fiber (ARoF) is a prospective alternative for future mobile fronthaul where current solutions fall short to fulfill future demands on bandwidth, synchronization, and/or power consumption. This paper presents an experimental validation of coherent joint transmissions (CJTs) in a two TRxPs D-MIMO network where ARoF fronthaul links allow to meet the required level of synchronization. Results show that by means of CJT a combined diversity and power gain of +5 dB is realized in comparison with a single TRxP transmission., Comment: Accepted in EuCNC 2023 Conference, 6 pages, 8 figures

Published
2023

3. Unipolar quantum optoelectronics for high speed direct modulation and transmission in 8–14 µm atmospheric window

Author

Dely, Hamza, Joharifar, Mahdieh, Durupt, Laureline, Ostrovskis, Armands, Schatz, Richard, Bonazzi, Thomas, Maisons, Gregory, Gacemi, Djamal, Salgals, Toms, Zhang, Lu, Spolitis, Sandis, Sun, Yan-Ting, Bobrovs, Vjačeslavs, Yu, Xianbin, Sagnes, Isabelle, Pantzas, Konstantinos, Vasanelli, Angela, Ozolins, Oskars, Pang, Xiaodan, and Sirtori, Carlo

Published
2024
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4. NR Conformance Testing of Analog Radio-over-LWIR FSO Fronthaul link for 6G Distributed MIMO Networks

Author

Puerta, Rafael, Han, Mengyao, Joharifar, Mahdieh, Schatz, Richard, Sun, Yan-Ting, Fan, Yuchuan, Djupsjöbacka, Anders, Maisons, Grégory, Abautret, Johan, Teissier, Roland, Zhang, Lu, Spolitis, Sandis, Wang, Muguang, Bobrovs, Vjaceslavs, Lourdudoss, Sebastian, Yu, Xianbin, Popov, Sergei, Ozolins, Oskars, and Pang, Xiaodan

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

We experimentally test the compliance with 5G/NR 3GPP technical specifications of an analog radio-over-FSO link at 9 {\mu}m. The ACLR and EVM transmitter requirements are fulfilled validating the suitability of LWIR FSO for 6G fronthaul., Comment: Accepted in Optical Fiber Communication Conference (OFC) 2023, 3 pages, 2 figures

Published
2023

5. Self-Evolutionary Reservoir Computer Based on Kuramoto Model

Author

Zuo, Zhihao, Gan, Zhongxue, Fan, Yuchuan, Bobrovs, Vjaceslavs, Pang, Xiaodan, and Ozolins, Oskars

Subjects
Computer Science - Neural and Evolutionary Computing, Nonlinear Sciences - Adaptation and Self-Organizing Systems
Abstract

The human brain's synapses have remarkable activity-dependent plasticity, where the connectivity patterns of neurons change dramatically, relying on neuronal activities. As a biologically inspired neural network, reservoir computing (RC) has unique advantages in processing spatiotemporal information. However, typical reservoir architectures only take static random networks into account or consider the dynamics of neurons and connectivity separately. In this paper, we propose a structural autonomous development reservoir computing model (sad-RC), which structure can adapt to the specific problem at hand without any human expert knowledge. Specifically, we implement the reservoir by adaptive networks of phase oscillators, a commonly used model for synaptic plasticity in biological neural networks. In this co-evolving dynamic system, the dynamics of nodes and coupling weights in the reservoir constantly interact and evolve together when disturbed by external inputs., Comment: 13 pages, 7 figures

Published
2023

7. Reconfigurable frequency coding of triggered single photons in the telecom C--band

Author

Gyger, Samuel, Zeuner, Katharina D., Jöns, Klaus D., Elshaari, Ali W., Paul, Matthias, Popov, Sergei, Hedlund, Carl Reuterskiöld, Hammar, Mattias, Ozolins, Oskars, and Zwiller, Val

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Quantum Physics
Abstract

In this work, we demonstrate reconfigurable frequency manipulation of quantum states of light in the telecom C-band. Triggered single photons are encoded in a superposition state of three channels using sidebands up to 53 GHz created by an off-the-shelf phase modulator. The single photons are emitted by an InAs/GaAs quantum dot grown by metal-organic vapor-phase epitaxy within the transparency window of the backbone fiber optical network. A cross-correlation measurement of the sidebands demonstrates the preservation of the single photon nature; an important prerequisite for future quantum technology applications using the existing telecommunication fiber network., Comment: Samuel Gyger and Katharina D. Zeuner contributed equally

Published
2019
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8. High-speed PAM4-based Optical SDM Interconnects with Directly Modulated Long-wavelength VCSEL

Author

Van Kerrebrouck, Joris, Pang, Xiaodan, Ozolins, Oskars, Lin, Rui, Udalcovs, Aleksejs, Zhang, Lu, Li, Haolin, Spiga, Silvia, Amann, Markus-Christian, Gan, Lin, Tang, Ming, Fu, Songnian, Schatz, Richard, Jacobsen, Gunnar, Popov, Sergei, Liu, Deming, Tong, Weijun, Torfs, Guy, Bauwelinck, Johan, Chen, Jiajia, and Yin, Xin

Subjects
Electrical Engineering and Systems Science - Signal Processing, Computer Science - Networking and Internet Architecture
Abstract

This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-{\mu}m single-mode vertical cavity surface emitting laser (SM-VCSEL) over multicore fiber with 7 cores over different distances. We have successfully generated up to 70 Gbaud 4-level pulse amplitude modulation (PAM-4) signals with a VCSEL in optical back-to-back, and transmitted 50 Gbaud PAM-4 signals over both 1-km dispersion-uncompensated and 10-km dispersion-compensated in each core, enabling a total data throughput of 700 Gbps over the 7-core fiber. Moreover, 56 Gbaud PAM-4 over 1-km has also been shown, whereby unfortunately not all cores provide the required 3.8 $\times$ 10 $^{-3}$ bit error rate (BER) for the 7% overhead-hard decision forward error correction (7% OH HDFEC). The limited bandwidth of the VCSEL and the adverse chromatic dispersion of the fiber are suppressed with pre-equalization based on accurate end-to-end channel characterizations. With a digital post-equalization, BER performance below the 7% OH-HDFEC limit is achieved over all cores. The demonstrated results show a great potential to realize high-capacity and compact short-reach optical interconnects for data centers., Comment: 7 pages, accepted to publication in 'Journal of Lightwave Technology (JLT)

Published
2018
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9. Inter-Core Crosstalk in Multicore Fibers: Impact on 56-Gbaud/{\lambda}/Core PAM-4 Transmission

Author

Udalcovs, Aleksejs, Lin, Rui, Ozolins, Oskars, Gan, Lin, Zhang, Lu, Pang, Xiaodan, Schatz, Richard, Djupsjöbacka, Anders, Tang, Ming, Fu, Songnian, Liu, Deming, Tong, Weijun, Popov, Sergei, Jacobsen, Gunnar, and Chen, Jiajia

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

We experimentally demonstrate the impact of inter-core crosstalk in multicore fibers on 56Gbaud PAM-4 signal quality after 2.5-km transmission over a weakly-coupled and uncoupled sevencore fibers, revealing the crosstalk dependence on carrier central wavelength in range of 1540-1560 nm., Comment: 3 pages, 44th European Conference on Optical Communication (ECOC 2018), Rome, Italy, 2018

Published
2018

10. 140 Gbaud On-Off Keying Links in C-Band for Short-Reach Optical Interconnects

Author

Ozolins, Oskars, Estaran, José Manuel, Udalcovs, Aleksejs, Jorge, Filipe, Mardoyan, Haik, Konczykowska, Agnieszka, Riet, Muriel, Duval, Bernadette, Nodjiadjim, Virginie, Dupuy, Jean-Yves, Pang, Xiaodan, Westergren, Urban, Chen, Jiajia, Popov, Sergei, and Bigo, Sébastien

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

We demonstrate 140 Gbaud intensity modulated direct detection dispersion-uncompensated links with Mach Zehnder modulator and distributed feedback travelling-wave electro-absorption modulator over 5500 and 960 meters of standard single mode fibre, respectively, enabled by compact packaged ultra-high speed InP-based 2:1-Selector., Comment: 3 pages, 44th European Conference on Optical Communication (ECOC 2018), Rome, Italy, 2018

Published
2018

11. Telecom Compatibility Validation of Quantum Key Distribution Co-existing with 112 Gbps/{\lambda}/core Data Transmission in Non-Trench and Trench-Assistant Multicore Fibers

Author

Lin, Rui, Udalcovs, Aleksejs, Ozolins, Oskars, Pang, Xiaodan, Gan, Lin, Shen, Li, Tang, Ming, Fu, Songnian, Popov, Sergei, Yang, Chen, Tong, Weijun, Liu, Deming, Silva, Thiago Ferreira, Xavier, Guilherme B., and Chen, Jiajia

Subjects
Quantum Physics, Physics - Optics
Abstract

We experimentally characterize photon leakage from 112Gbps data channels in both non-trench and trench-assistant 7-core fibers, demonstrating telecom compatibility for QKD co-existing with high-speed data transmission when a proper core/wavelength allocation is carried out., Comment: 3 pages, 44th European Conference on Optical Communication (ECOC 2018), Rome, Italy, 2018

Published
2018

12. Digital Radio-over-Multicore-Fiber System with Self-Homodyne Coherent Detection and Entropy Coding for Mobile Fronthaul

Author

Zhang, Lu, Udalcovs, Aleksejs, Lin, Rui, Ozolins, Oskars, Pang, Xiaodan, Gan, Lin, Schatz, Richard, Djupsjöbacka, Anders, Mårtensson, Jonas, Tang, Ming, Fu, Songnian, Liu, Deming, Tong, Weijun, Popov, Sergei, Jacobsen, Gunnar, Hu, Weisheng, Xiao, Shilin, and Chen, Jiajia

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

We experimentally demonstrate a 28-Gbaud 16-QAM self-homodyne digital radio-over- 33.6km-7-core-fiber system with entropy coding for mobile fronthaul, achieving error-free carrier aggregation of 330 100-MHz 4096-QAM 5G-new-radio channels and 921 100-MHz QPSK 5G-new-radio channels with CPRI-equivalent data rate up to 3.73-Tbit/s., Comment: 3 pages, 44th European Conference on Optical Communication (ECOC 2018), Rome, Italy, 2018

Published
2018

13. Experimental Demonstration of 503.61-Gbit/s DMT over 10-km 7-Core Fiber with 1.5-\mu m SM-VCSEL for Optical Interconnects

Author

Zhang, Lu, Van Kerrebrouck, Joris, Ozolins, Oskars, Lin, Rui, Pang, Xiaodan, Udalcovs, Aleksejs, Spiga, Siliva, Amann, Markus C., Gan, Lin, Tang, Ming, Fu, Songnian, Schatz, Richard, Jacobsen, Gunnar, Popov, Sergei, Liu, Deming, Tong, Weijun, Torfs, Guy, Bauwelinck, Johan, Yin, Xin, Xiao, Shilin, and Chen, Jiajia

Subjects
Physics - Optics
Abstract

We experimentally demonstrate a net-rate 503.61-Gbit/s discrete multitone (DMT) transmission over 10-km 7-core fiber with 1.5-\mu m single mode VCSEL, where low-complexity kernelrecursive-least-squares algorithm is employed for nonlinear channel equalization., Comment: 3 pages, 44th European Conference on Optical Communication (ECOC 2018), Rome, Italy, 2018

Published
2018

14. Kernel Adaptive Filtering for Nonlinearity-Tolerant Optical Direct Detection Systems

Author

Zhang, Lu, Ozolins, Oskars, Lin, Rui, Udalcovs, Aleksejs, Pang, Xiaodan, Gan, Lin, Schatz, Richard, Djupsjöbacka, Anders, Mårtensson, Jonas, Westergren, Urban, Tang, Ming, Fu, Sonnian, Liu, Deming, Tong, Weijun, Popov, Sergei, Jacobsen, Gunnar, Hu, Weisheng, Xiao, Shilin, and Chen, Jiajia

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

Kernel adaptive filtering (KAF) is proposed for nonlinearity-tolerant optical direct detection. For 7x128Gbit/s PAM4 transmission over 33.6km 7-core-fiber, KAF only needs 10 equalizer taps to reach KP4-FEC limit (BER@2.2e-4), whereas decision-feedback-equalizer needs 43 equalizer taps to reach HD-FEC limit (BER@3.8e-3)., Comment: 3 pages, 44th European Conference on Optical Communication (ECOC 2018), Rome, Italy, 2018

Published
2018

16. 170 Gbaud On-Off-Keying SiP Ring Resonator Modulator-based Link for Short-Reach Applications

Author

Ostrovskis, Armands, primary, Salgals, Toms, additional, Koenigsmann, Michael, additional, Farid, Azra, additional, Marinins, Aleksandrs, additional, Krüger, Benjamin, additional, Pittalà, Fabio, additional, Scott, Ryan P., additional, Haisch, Hansjoerg, additional, Zhang, Lu, additional, Yu, Xianbin, additional, Puerta, Rafael, additional, Spolitis, Sandis, additional, Schatz, Richard, additional, Gallo, Katia, additional, Gruen, Markus, additional, Louchet, Hadrien, additional, Yamaguchi, Kazuo, additional, Bobrovs, Vjaceslavs, additional, Pang, Xiaodan, additional, and Ozolins, Oskars, additional

Published
2024
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17. 106.25 Gbaud On-Off Keying and Pulse Amplitude Modulation Links Supporting Next Generation Ethernet on Single Lambda

Author

Ostrovskis, Armands, primary, Salgals, Toms, additional, Krüger, Benjamin, additional, Pittalà, Fabio, additional, Joharifar, Mahdieh, additional, Schatz, Richard, additional, Koenigsmann, Michael, additional, Fan, Yuchuan, additional, Chacinski, Marek, additional, Westergren, Urban, additional, Zhang, Lu, additional, Mardoyan, Haik, additional, Spolitis, Sandis, additional, Popov, Sergei, additional, Yu, Xianbin, additional, Gruen, Markus, additional, Bobrovs, Vjaceslavs, additional, Louchet, Hadrien, additional, Pang, Xiaodan, additional, and Ozolins, Oskars, additional

Published
2024
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18. 16.9 Gb/s Single-Channel LWIR FSO Data Transmission with Directly Modulated QCL and MCT Detector

Author

Joharifar, Mahdieh, primary, Dely, Hamza, additional, Durupt, Laureline, additional, Ostrovskis, Armands, additional, Schatz, Richard, additional, Puerta, Rafael, additional, Bonazzi, Thomas, additional, Maisons, Gregory, additional, Gacemi, Djamal, additional, Zhang, Lu, additional, Spolitis, Sandis, additional, Sun, Yan-Ting, additional, Bobrovs, Vjačeslavs, additional, Yu, Xianbin, additional, Vasanelli, Angela, additional, Ozolins, Oskars, additional, Sirtori, Carlo, additional, and Pang, Xiaodan, additional

Published
2024
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19. Free Space Communication Enabled by Directly Modulated Quantum Cascade Laser

Author

Pang, Xiaodan, primary, Schatz, Richard, additional, Joharifar, Mahdieh, additional, Dely, Hamza, additional, Durupt, Laureline, additional, Maisons, Gregory, additional, Gacemi, Djamal, additional, Puerta, Rafael, additional, Bonazzi, Thomas, additional, Zhang, Lu, additional, Spolitis, Sandis, additional, Sun, Yan-Ting, additional, Bobrovs, Vjačeslavs, additional, Yu, Xianbin, additional, Vasanelli, Angela, additional, Sirtori, Carlo, additional, and Ozolins, Oskars, additional

Published
2024
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20. Heterogenous InP Electro-Absorption Modulator with Si Waveguides for Beyond 200 Gbps/λ Optical Interconnects

Author

Ostrovskis, Armands, primary, Szczerba, Krzysztof, additional, Salgals, Toms, additional, Norberg, Erik, additional, Koenigsmann, Michael, additional, Sonkoly, John, additional, Rubuls, Kristaps, additional, Yun, Han, additional, Krüger, Benjamin, additional, Piels, Molly, additional, Sedulis, Arvids, additional, Pittalà, Fabio, additional, Spolitis, Sandis, additional, Gruen, Markus, additional, Louchet, Hadrien, additional, Jahn, Robert, additional, Yamaguchi, Kazuo, additional, Bobrovs, Vjaceslavs, additional, Pang, Xiaodan, additional, Guzzon, Robert, additional, and Ozolins, Oskars, additional

Published
2024
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25. Analog Mobile Fronthaul for 6G and Beyond

Author

Puerta, Rafael, Jiang, Tianyu, Joharifar, Mahdieh, Ostrovskis, Armands, Salgals, Toms, Rubuls, Kristaps, Schatz, Richard, Djupsjobacka, Anders, Pittala, Fabio, Gruen, Markus, Louchet, Hadrien, Zhang, Lu, Spolitis, Sandis, Bobrovs, Vjaceslavs, Yu, Xianbin, Ozolins, Oskars, and Pang, Xiaodan

Abstract

This article highlights the potential of photonic-assisted analog fronthaul solutions, particularly analog radio-over-fiber (ARoF) and analog radio-over-free-space-optics (ARoFSO), as prospective alternatives for the development of 6G applications. First, we present (New-Radio) NR/5G conformance testing of ARoF and ARoFSO fronthaul links, including the assessment of the error vector magnitude (EVM) and adjacent channel leakage power ratio (ACLR) to demonstrate compliance with the minimum transmitter requirements outlined by the 3rd Generation Partnership Project (3GPP) standards. Then, with focus on future 6G Distributed-MIMO (D-MIMO) networks, we conduct experimental validations of coherent joint transmissions (CJT) using ARoF and ARoFSO fronthaul links in a 2-transmitter D-MIMO network, demonstrating MIMO gains of up to 5.35 dB and that these links meet the stringent synchronization demands for CJT. These tests represent the first realizations of CJT utilizing ARoF and ARoFSO links. Finally, for consistency, we validate CJT in a 4-transmitter D-MIMO network with ARoF fronthaul links, with MIMO gains up to 9.4 dB and confirming our previous results. This evidence indicates that these technologies hold significant potential for applications in future 6G systems.

Published
2024
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27. High Spectral Efficiency Long-Wave Infrared Free-Space Optical Transmission With Multilevel Signals

Author

Han, Mengyao, primary, Joharifar, Mahdieh, additional, Wang, Muguang, additional, Schatz, Richard, additional, Puerta, Rafael, additional, Sun, Yan-ting, additional, Fan, Yuchuan, additional, Maisons, Grégory, additional, Abautret, Johan, additional, Teissier, Roland, additional, Zhang, Lu, additional, Spolitis, Sandis, additional, Bobrovs, Vjaceslavs, additional, Lourdudoss, Sebastian, additional, Yu, Xianbin, additional, Popov, Sergei, additional, Ozolins, Oskars, additional, and Pang, Xiaodan, additional

Published
2023
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29. High-Baudrate SiP and InP Modulators for Data Center Interconnects

Author

Ozolins, Oskars, primary, Ostrovskis, Armands, additional, Salgals, Toms, additional, Krüger, Benjamin, additional, Pittalà, Fabio, additional, Joharifar, Mahdieh, additional, Schatz, Richard, additional, Koenigsmann, Michael, additional, Fan, Yuchuan, additional, Westergren, Urban, additional, Mardoyan, Haik, additional, Zhang, Lu, additional, Spolitis, Sandis, additional, Yu, Xianbin, additional, Gruen, Markus, additional, Bobrovs, Vjaceslavs, additional, Louchet, Hadrien, additional, and Pang, Xiaodan, additional

Published
2023
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30. Quantum Noise Secured Terahertz Communications

Author

Zhang, Lu, primary, Deng, Qiuzhuo, additional, Zhang, Hongqi, additional, Yang, Zuomin, additional, Pang, Xiaodan, additional, Bobrovs, Vjaceslavs, additional, Popov, Sergei, additional, Wu, Yixin, additional, Yu, Xiongbin, additional, Ozolins, Oskars, additional, and Yu, Xianbin, additional

Published
2023
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31. High-Baudrate Silicon Photonics Ring Resonator and Mach-Zehnder Modulators for Short-Reach Applications

Author

Ozolins, Oskars, primary, Ostrovskis, Armands, additional, Koenigsmann, Michael, additional, Salgals, Toms, additional, Krüger, Benjamin, additional, Pittalà, Fabio, additional, Scott, Ryan P., additional, Haisch, Hansjoerg, additional, Louchet, Hadrien, additional, Marinins, Aleksandrs, additional, Spolitis, Sandis, additional, Porins, Jurgis, additional, Zhang, Lu, additional, Schatz, Richard, additional, Yu, Xianbin, additional, Bobrovs, Vjaceslavs, additional, Gruen, Markus, additional, and Pang, Xiaodan, additional

Published
2023
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33. Silica micro-rod resonator-based Kerr frequency comb for high-speed short-reach optical interconnects

Author

Murnieks, Rihards, primary, Salgals, Toms, additional, Alnis, Janis, additional, Ostrovskis, Armands, additional, Ozolins, Oskars, additional, Brice, Inga, additional, Sedulis, Arvids, additional, Draguns, Kristians, additional, LYASHUK, ILYA, additional, Berkis, Roberts, additional, Udalcovs, Aleksejs, additional, Bi, Toby, additional, Pang, Xiaodan, additional, Porins, Jurgis, additional, Spolitis, Sandis, additional, Del Haye, Pascal, additional, and Bobrovs, Vjaceslavs, additional

Published
2023
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34. 240/160 Gbaud OOK Silicon Photonics MZM/RRM Transmitters for Short-Reach Applications

Author

Ostrovskis, Armands, primary, Koenigsmann, Michael, additional, Salgals, Toms, additional, Krüger, Benjamin, additional, Pittalà, Fabio, additional, Scott, Ryan P., additional, Haisch, Hansjoerg, additional, Louchet, Hadrien, additional, Marinins, Aleksandrs, additional, Spolitis, Sandis, additional, Porins, Jurgis, additional, Zhang, Lu, additional, Schatz, Richard, additional, Yu, Xianbin, additional, Bobrovs, Vjaceslavs, additional, Gruen, Markus, additional, Pang, Xiaodan, additional, and Ozolins, Oskars, additional

Published
2023
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35. Optical amplification-free deep reservoir computing-assisted high baudrate short reach communication

Author

Han, Mengyao, primary, Wang, Muguang, additional, Fan, Yuchuan, additional, Salgals, Toms, additional, Louchet, Hadrien, additional, Schatz, Richard, additional, Gruen, Markus, additional, Pittalà, Fabio, additional, Krüger, Benjamin, additional, Dippon, Thomas, additional, Zhang, Lu, additional, Yu, Xianbin, additional, Spolitis, Sandis, additional, Bobrovs, Vjaceslavs, additional, Popov, Sergei, additional, Pang, Xiaodan, additional, and Ozolins, Oskars, additional

Published
2023
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36. 8.1 Gbps PAM8 Long-Wave IR FSO Transmission using a 9.15-µm Directly-Modulated QCL with an MCT Detector

Author

Joharifar, Mahdieh, primary, Han, Mengyao, additional, Schatz, Richard, additional, Puerta, Rafael, additional, Sun, Yan-Ting, additional, Fan, Yuchuan, additional, Maisons, Grégory, additional, Abautret, Johan, additional, Teissier, Roland, additional, Zhang, Lu, additional, Spolitis, Sandis, additional, Wang, Muguang, additional, Bobrovs, Vjaceslavs, additional, Lourdudoss, Sebastian, additional, Yu, Xianbin, additional, Popov, Sergei, additional, Ozolins, Oskars, additional, and Pang, Xiaodan, additional

Published
2023
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37. Quantum Noise Secured Terahertz Communications

Author

Deng, Qiuzhuo, primary, Zhang, Lu, additional, Zhang, Hongqi, additional, Yang, Zuomin, additional, Pang, Xiaodan, additional, Bobrovs, Vjačeslavs, additional, Popov, Sergei, additional, Wu, Yixin, additional, Yu, Xiongbin, additional, Ozolins, Oskars, additional, and Yu, Xianbin, additional

Published
2023
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38. Deep Reservoir Computing for 100 Gbaud PAM6 IM/DD Transmission Impairment Mitigation

Author

Han, Mengyao, primary, Wang, Muguang, additional, Fan, Yuchuan, additional, Salgals, Toms, additional, Louchet, Hadrien, additional, Schatz, Richard, additional, Gruen, Markus, additional, Pittala, Fabio, additional, Kruger, Benjamin, additional, Dippon, Thomas, additional, Zhang, Lu, additional, Yu, Xianbin, additional, Spolitis, Sandis, additional, Bobrovs, Vjaceslavs, additional, Popov, Sergei, additional, Pang, Xiaodan, additional, and Ozolins, Oskars, additional

Published
2023
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39. 106.25 Gbaud 4-Level Pulse Amplitude Modulation Links Supporting (2x)100Gigabit Ethernet on Single Lambda

Author

Ozolins, Oskars, primary, Ostrovskis, Armands, additional, Salgals, Toms, additional, Krüger, Benjamin, additional, Pittala, Fabio, additional, Joharifar, Mahdieh, additional, Schatz, Richard, additional, Che, Di, additional, Matsui, Yasuhiro, additional, Dippon, Thomas, additional, Fan, Yuchuan, additional, Udalcovs, Aleksejs, additional, Chacinski, Marek, additional, Westergren, Urban, additional, Zhang, Lu, additional, Mardoyan, Haik, additional, Yu, Xianbin, additional, Spolitis, Sandis, additional, Popov, Sergei, additional, Gruen, Markus, additional, Bobrovs, Vjaceslavs, additional, Louchet, Hadrien, additional, and Pang, Xiaodan, additional

Published
2023
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40. Photonic-wireless Communication and Sensing in the Terahertz Band

Author

Yu, Xianbin, primary, Zhang, Hongqi, additional, Yang, Zuomin, additional, Lyu, Zhidong, additional, Yang, Hang, additional, He, Yuqian, additional, Liu, Siqi, additional, Li, Nan, additional, Ozolins, Oskars, additional, Pang, Xiaodan, additional, Zhang, Lu, additional, and Zhang, Xianmin, additional

Published
2023
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41. The future of multi-terabit datacenter interconnects based on tight co-integration of photonics and electronics technologies

Author

Spyropoulou, Maria, primary, Kanakis, Giannis, additional, Brestas, Giorgos, additional, Jiao, Yuqing, additional, Abdi, Salim, additional, Chen, Zhaowei, additional, Wolde, Desalegn Feyisa, additional, Stabile, Ripalta, additional, Calabretta, Nicola, additional, Williams, Kevin, additional, Nodjiadjim, Virginie, additional, Hersent, Romain, additional, Konczykowska, Agnieszka, additional, Riet, Muriel, additional, Schatz, Richard, additional, Ozolins, Oskars, additional, Pang, Xiaodan, additional, Joharifar, Mahdieh, additional, Zvěřina, Jakub, additional, Žoldák, Martin, additional, Atias, Boaz, additional, Bakopoulos, Paraskevas, additional, Mentovich, Elad, additional, and Avramopoulos, Hercules, additional

Published
2023
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42. NR Conformance Testing of Analog Radio-over-LWIR FSO Fronthaul link for 6G Distributed MIMO Networks

Author

Puerta, Rafael, primary, Han, Mengyao, additional, Joharifar, Mahdieh, additional, Schatz, Richard, additional, Sun, Yan-Ting, additional, Fan, Yuchuan, additional, Djupsjöbacka, Anders, additional, Maisons, Grégory, additional, Abautret, Johan, additional, Teissier, Roland, additional, Zhang, Lu, additional, Spolitis, Sandis, additional, Wang, Muguang, additional, Bobrovs, Vjaceslavs, additional, Lourdudoss, Sebastian, additional, Yu, Xianbin, additional, Popov, Sergei, additional, Ozolins, Oskars, additional, and Pang, Xiaodan, additional

Published
2023
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43. Optical Amplification-Free 310/256 Gbaud OOK, 197/145 Gbaud PAM4, and 160/116 Gbaud PAM6 EML/DML-based Data Center Links

Author

Ozolins, Oskars, primary, Ostrovskis, Armands, additional, Salgals, Toms, additional, Krüger, Benjamin, additional, Pittalà, Fabio, additional, Joharifar, Mahdieh, additional, Schatz, Richard, additional, Che, Di, additional, Matsui, Yasuhiro, additional, Dippon, Thomas, additional, Koenigsmann, Michael, additional, Fan, Yuchuan, additional, Chacinski, Marek, additional, Westergren, Urban, additional, Zhang, Lu, additional, Mardoyan, Haik, additional, Spolitis, Sandis, additional, Popov, Sergei, additional, Yu, Xianbin, additional, Gruen, Markus, additional, Bobrovs, Vjaceslavs, additional, Louchet, Hadrien, additional, and Pang, Xiaodan, additional

Published
2023
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44. Optical Amplification-Free High Baudrate Links for Intra-Data Center Communications

Author

Ozolins, Oskars, primary, Joharifar, Mahdieh, additional, Salgals, Toms, additional, Louchet, Hadrien, additional, Schatz, Richard, additional, Gruen, Markus, additional, Dippon, Thomas, additional, Kruger, Benjamin, additional, Pittala, Fabio, additional, Che, Di, additional, Matsui, Yasuhiro, additional, Fan, Yuchuan, additional, Udalcovs, Aleksejs, additional, Westergren, Urban, additional, Zhang, Lu, additional, Yu, Xianbin, additional, Spolitis, Sandis, additional, Bobrovs, Vjaceslavs, additional, Popov, Sergei, additional, and Pang, Xiaodan, additional

Published
2023
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45. High-Speed 9.6-μm Long-Wave Infrared Free-Space Transmission With a Directly-Modulated QCL and a Fully-Passive QCD

Author

Joharifar, Mahdieh, primary, Dely, Hamza, additional, Pang, Xiaodan, additional, Schatz, Richard, additional, Gacemi, Djamal, additional, Salgals, Toms, additional, Udalcovs, Aleksejs, additional, Sun, Yan-Ting, additional, Fan, Yuchuan, additional, Zhang, Lu, additional, Rodriguez, Etienne, additional, Spolitis, Sandis, additional, Bobrovs, Vjaceslavs, additional, Yu, Xianbin, additional, Lourdudoss, Sebastian, additional, Popov, Sergei, additional, Vasanelli, Angela, additional, Ozolins, Oskars, additional, and Sirtori, Carlo, additional

Published
2023
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46. Quantum Noise Secured Terahertz Communications

Author

Zhang, Lu, Deng, Qiuzhuo, Zhang, Hongqi, Yang, Zuomin, Pang, Xiaodan, Bobrovs, Vjaceslavs, Popov, Sergei, Wu, Yixin, Yu, Xiongbin, Ozolins, Oskars, Yu, Xianbin, Zhang, Lu, Deng, Qiuzhuo, Zhang, Hongqi, Yang, Zuomin, Pang, Xiaodan, Bobrovs, Vjaceslavs, Popov, Sergei, Wu, Yixin, Yu, Xiongbin, Ozolins, Oskars, and Yu, Xianbin

Abstract

The terahertz communications display an important role in high-speed wireless communications, the security threat from the eavesdroppers in the terahertz communications has been gaining attention recently. The true randomness in the physical layer can ensure one-time-pad encryption for secured terahertz communications, however, physical layer security schemes like the quantum key distribution methods suffer from device imperfections that limit the desirable signal rate and link distance. Herein, we present the quantum noise secured terahertz wireless communications with photonic terahertz signal generation schemes. With the high-order diffusion algorithms, the signal is masked by the quantum noise ciphers to the eavesdroppers and cannot be detected because the inevitable randomness by quantum noise measurement will cause physical measurement errors. In the experiment, we demonstrate 16 Gbits(-1) quantum noise secured terahertz wireless communications with the conventional optical communication realms and devices, operating at 300 GHz terahertz frequency. This quantum noise secured terahertz communication approach is a significant step toward high-security wireless communications., QC 20221223

Published
2023
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47. Video quality of video professionals for Video Assisted Referee (VAR)

Author

Brunnström, Kjell, Djupsjöbacka, Anders, Billingham, Johsan, Wistel, Katharina, Andrén, Börje, Ozolins, Oskars, Evans, Nicolas, Brunnström, Kjell, Djupsjöbacka, Anders, Billingham, Johsan, Wistel, Katharina, Andrén, Börje, Ozolins, Oskars, and Evans, Nicolas

Abstract

Changes in the footballing world's approach to technology and innovation contributed to the decision by the International Football Association Board to introduce Video Assistant Referees (VAR). The change meant that under strict protocols referees could use video replays to review decisions in the event of a "clear and obvious error" or a "serious missed incident". This led to the need by Fédération Internationale de Football Association (FIFA) to develop methods for quality control of the VAR-systems, which was done in collaboration with RISE Research Institutes of Sweden AB. One of the important aspects is the video quality. The novelty of this study is that it has performed a user study specifically targeting video experts i.e., to measure the perceived quality of video professionals working with video production as their main occupation. An experiment was performed involving 25 video experts. In addition, six video quality models have been benchmarked against the user data and evaluated to show which of the models could provide the best predictions of perceived quality for this application. Video Quality Metric for variable frame delay (VQM_VFD) had the best performance for both formats, followed by Video Multimethod Assessment Fusion (VMAF) and VQM General model., QC 20230919

Published
2023
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48. High-Baudrate Silicon Photonics Ring Resonator and Mach-Zehnder Modulators for Short-Reach Applications

Author

Ozolins, Oskars, Ostrovskis, Armands, Koenigsmann, Michael, Salgals, Toms, Krüger, Benjamin, Pittalà, Fabio, Scott, Ryan P., Haisch, Hansjoerg, Louchet, Hadrien, Marinins, Aleksandrs, Spolitis, Sandis, Porins, Jurgis, Zhang, Lu, Schatz, Richard, Yu, Xianbin, Bobrovs, Vjaceslavs, Gruen, Markus, Pang, Xiaodan, Ozolins, Oskars, Ostrovskis, Armands, Koenigsmann, Michael, Salgals, Toms, Krüger, Benjamin, Pittalà, Fabio, Scott, Ryan P., Haisch, Hansjoerg, Louchet, Hadrien, Marinins, Aleksandrs, Spolitis, Sandis, Porins, Jurgis, Zhang, Lu, Schatz, Richard, Yu, Xianbin, Bobrovs, Vjaceslavs, Gruen, Markus, and Pang, Xiaodan

Abstract

Silicon photonics (SiP) is a key enabling technology for high-baudrate communication. It is a key technology for future 800 Gbps and 1.6 Tbps solutions to meet the ever-increasing demands. The 800G pluggable multi-source agreement (MSA) suggests that intensity-modulated direct-detection (IM/DD) is the most sustainable way forward [1]. The high operational bandwidth of each transceiver component is essential. An ultra-compact SiP slow light modulator with record-high bandwidth of 110 GHz shows the potential [2]. Therefore, both multilevel pulse amplitude modulation (PAM) and on-off keying (OOK) should be considered. SiP offers excellent production yield and has a substantial role in optical interconnects. SiP ring resonator modulators (RRM) have unique advantages like a small footprint, simple driver configuration, low power consumption, and suitability for multichannel applications. On the other hand, the SiP Mach-Zehnder modulator (MZM) offers differential drive benefits., Part of ISBN 9798350303032QC 20230919

Published
2023
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49. The future of multi-terabit datacenter interconnects based on tight co-integration of photonics and electronics technologies

Author

Spyropoulou, Maria, Kanakis, Giannis, Brestas, Giorgos, Jiao, Yuqing, Abdi, Salim, Chen, Zhaowei, Wolde, Desalegn Feyisa, Stabile, Ripalta, Calabretta, Nicola, Williams, Kevin, Nodjiadjim, Virginie, Hersent, Romain, Konczykowska, Agnieszka, Riet, Muriel, Schatz, Richard, Ozolins, Oskars, Pang, Xiaodan, Joharifar, Mahdieh, Zverina, Jakub, Zoldak, Martin, Atias, Boaz, Bakopoulos, Paraskevas, Mentovich, Elad, Avramopoulos, Hercules, Spyropoulou, Maria, Kanakis, Giannis, Brestas, Giorgos, Jiao, Yuqing, Abdi, Salim, Chen, Zhaowei, Wolde, Desalegn Feyisa, Stabile, Ripalta, Calabretta, Nicola, Williams, Kevin, Nodjiadjim, Virginie, Hersent, Romain, Konczykowska, Agnieszka, Riet, Muriel, Schatz, Richard, Ozolins, Oskars, Pang, Xiaodan, Joharifar, Mahdieh, Zverina, Jakub, Zoldak, Martin, Atias, Boaz, Bakopoulos, Paraskevas, Mentovich, Elad, and Avramopoulos, Hercules

Abstract

We propose a novel co-packaged optical transceiver architecture capable of operating at 112 Gbaud per lane and scalable to 1.6 Tb/s capacity and beyond for next generation 51.2T and 102.4T digital switches., QC 20230810

Published
2023

50. Photonic-wireless Communication and Sensing in the Terahertz Band

Author

Yu, Xianbin, Zhang, Hongqi, Yang, Zuomin, Lyu, Zhidong, Yang, Hang, He, Yuqian, Liu, Siqi, Li, Nan, Ozolins, Oskars, Pang, Xiaodan, Zhang, Lu, Zhang, Xianmin, Yu, Xianbin, Zhang, Hongqi, Yang, Zuomin, Lyu, Zhidong, Yang, Hang, He, Yuqian, Liu, Siqi, Li, Nan, Ozolins, Oskars, Pang, Xiaodan, Zhang, Lu, and Zhang, Xianmin

Abstract

This paper reviews the potential of THz photonics in communication and sensing by presenting our experimental results in the 300-500 GHz. Benefiting from the large available bandwidth in both THz and photonics, THz communications with high speed and THz imaging with high resolution have been achieved., QC 20230811

Published
2023

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