Article
Engineering, Electrical & Electronic
Xiaodan Pang, Oskars Ozolins, Shi Jia, Lu Zhang, Richard Schatz, Aleksejs Udalcovs, Vjaceslavs Bobrovs, Hao Hu, Toshio Morioka, Yan-Ting Sun, Jiajia Chen, Sebastian Lourdudoss, Leif Oxenlowe, Sergei Popov, Xianbin Yu
Summary: Since one and half centuries ago, radio and optics have been separate electromagnetic spectrum regions for data transmission, but now the boundaries between them are becoming blurred and intercrossed. Optical technologies are expanding into infrared regions, while radio technologies strive for higher frequencies to gain broader bandwidth. Technological breakthroughs in photonics-assisted free-space transmission have been witnessed in recent years.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Mike S. Ferraro, Rita Mahon, William S. Rabinovich, Andrew G. Coffee, James L. Murphy, James L. Dexter, Wade T. Freeman
Summary: Increased capacity demands and RF congestion have led to increased attention on FSO communication as an augmentation technology. FSO can provide high link bandwidths and data security without RF spectral constraints. However, the performance of FSO links can be impacted by various factors, which can dynamically change.
OPTICAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Mengyao Han, Mahdieh Joharifar, Muguang Wang, Yuchuan Fan, Gregory Maisons, Johan Abautret, Yan-Ting Sun, Roland Teissier, Lu Zhang, Vjaceslavs Bobrovs, Xianbin Yu, Richard Schatz, Sergei Popov, Oskars Ozolins, Xiaodan Pang
Summary: This experiment demonstrates a free-space optical (FSO) transmission system in the long-wave infrared (LWIR, 9.15 μm) utilizing a directly modulated quantum cascade laser (DM-QCL) and a commercial mercury-cadmium-telluride infrared photovoltaic detector. The DMQCL is current-modulated by discrete multitone signals pre-processed with bit-/power-loading at room temperature. A data rate of up to 5.1 Gbit/s is achieved with a bit error rate performance below the 6.25% overhead hard-decision forward error correction limit of 4.5 x 10(-3), enabled by a frequency domain equalizer. The stability study of the FSO system is also conducted at multiple temperature values. This study provides a valuable reference for future terrestrial and space communications.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Mengyao Han, Mahdieh Joharifar, Muguang Wang, Yuchuan Fan, Gregory Maisons, Johan Abautret, Yan-Ting Sun, Roland Teissier, Lu Zhang, Vjaceslavs Bobrovs, Xianbin Yu, Richard Schatz, Sergei Popov, Oskars Ozolins, Xiaodan Pang
Summary: In this study, a free-space optical transmission system is demonstrated in the long-wave infrared region using a directly modulated quantum cascade laser and a commercial infrared detector. The system achieved high-speed data transmission with the help of pre-processing and a frequency domain equalizer. The stability of the system was also investigated at different temperature values.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Xiaodan Pang, Richard Schatz, Mahdieh Joharifar, Aleksejs Udalcovs, Vjaceslavs Bobrovs, Lu Zhang, Xianbin Yu, Yan-Ting Sun, Gregory Maisons, Mathieu Carras, Sergei Popov, Sebastian Lourdudoss, Oskars Ozolins
Summary: A roadmap for future wireless communications is aiming to utilize all transmission-suitable spectrum bands, including the under-exploited mid-infrared (mid-IR) spectrum. This spectrum has gained interest in free-space optical (FSO) communications due to its low propagation loss and high tolerance of atmospheric perturbations. A quantum cascade laser (QCL) is considered a promising technological choice for viable mid-IR FSO transceivers, as it fulfills the requirements of high bandwidth, low energy consumption, and small footprint.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Ziyi Zhu, Molly Janasik, Alexander Fyffe, Darrick Hay, Yiyu Zhou, Brian Kantor, Taylor Winder, Robert W. Boyd, Gerd Leuchs, Zhimin Shi
Summary: Free-space optical communication shows promise for versatile and high-bandwidth communication, but atmospheric turbulence can distort spatial modes. The authors demonstrate an experimentally turbulent-resistant communication protocol using vector beams to transmit high-dimensional information without the need for adaptive optics.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Huibin Zhou, Runzhou Zhang, Xinzhou Su, Yuxiang Duan, Haoqian Song, Hao Song, Kaiheng Zou, Robert W. Boyd, Moshe Tur, Alan E. Willner
Summary: The utilization efficiency of the detector's bandwidth can be increased by using self-homodyne detection in a pilot-assisted FSO link, which also improves the optical-to-electrical mixing efficiency under turbulent conditions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Mengyao Han, Mahdieh Joharifar, Muguang Wang, Richard Schatz, Rafael Puerta, Yan-ting Sun, Yuchuan Fan, Gregory Maisons, Johan Abautret, Roland Teissier, Lu Zhang, Sandis Spolitis, Vjaceslavs Bobrovs, Sebastian Lourdudoss, Xianbin Yu, Sergei Popov, Oskars Ozolins, Xiaodan Pang
Summary: This study explores the potential of long-wave infrared free-space optical (FSO) transmission using multilevel signals to achieve high spectral efficiency. The study conducts measurements and optimization on a directly modulated-quantum cascade laser (DM-QCL) chip and a mercury cadmium telluride (MCT) detector. The results show impressive performance of the FSO system, offering competitive solutions for the next generation of optical wireless communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Wenchen Li, Yijun Jiang, Wanwang Fu, Shichen Wu, Mi Lia
Summary: The atmospheric intensity scintillation effect deteriorates the communication quality of space chaos laser communication. The research analyzed the effect of internal and external mismatches induced by intensity scintillation on bit error rate (BER) in the space downlink chaos laser communication system. The results demonstrate that BER worsens with the effect of intensity scintillation, and internal mismatch has a greater impact on BER than external mismatch. These findings are valuable for designing practical space chaos laser communication systems with optimal performance.
OPTICAL ENGINEERING
(2022)
Article
Computer Science, Information Systems
Nikesh Devkota, Byung Wook Kim
Summary: This paper proposes a deep neural network-based method for detecting small targets in infrared images, which can be used to determine receiver alignment for establishing line-of-sight connection. Experimental results show that the proposed method outperforms conventional schemes.
Article
Environmental Sciences
Revital Marbel, Boaz Ben-Moshe, Tal Grinshpoun
Summary: This paper presents a laser communication framework for low Earth orbit satellites to download a large set of high-quality images from each satellite on a daily basis. The suggested solution utilizes laser communication, which requires no frequency licensing and enables communication with any optical ground station on Earth. The paper also introduces a free-space optical communication system for ground stations and nano-satellites, as well as a scheduling model for optimizing communication between ground stations and lasercom satellites. Additionally, the report highlights the launch of SATLLA-2B, a pico-satellite with basic free-space optics capabilities, and discusses the potential of using a swarm of lasercom pico-satellites as a global communication infrastructure with existing telescope-based observatories as ground stations.
Article
Optics
Tobias Pfeiffer, Jens Klier, Georg von Freymann, Daniel Molter
Summary: Nonlinear frequency conversion provides an elegant method for detecting low-energy photons with different wavelengths from the pump wavelength while providing phase information. We propose a phase-sensitive measurement method in the terahertz spectral range using visible light, which enables fast determination of layer thicknesses and achieves phase-resolved detection of terahertz pulses with standard equipment.
Article
Engineering, Electrical & Electronic
Lu Zhang, Qiuzhuo Deng, Hongqi Zhang, Zuomin Yang, Xiaodan Pang, Vjaceslavs Bobrovs, Sergei Popov, Yixin Wu, Xiongbin Yu, Oskars Ozolins, Xianbin Yu
Summary: The study presents a quantum noise secured terahertz wireless communication approach with photonic terahertz signal generation schemes. By masking the signal and introducing quantum noise ciphers, eavesdroppers are unable to detect the signal, ensuring high-security terahertz communication.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Optics
Jia Xu, Yaru Gao, Yangjian Cai, Taco D. D. Visser
Summary: This paper demonstrates that the focusing of a random electromagnetic beam through a lens results in a scintillation index at the geometric focus that differs from the incident beam. In the examples presented, focusing significantly increases the index. This observation is particularly important for optical communication systems, where scintillation is a major cause of signal degradation.
Article
Chemistry, Multidisciplinary
Changchun Ding, Chengming Li, Ziming Wang, Zhen Gao, Zijian Liu, Junfeng Song, Min Tao
Summary: This paper discusses the importance of optical communication modulation technology and networking technology in constructing free-space optical (FSO) communication. Pulse width modulation (PWM) is used to realize FSO communication, and a field programmable gate array (FPGA) is used for signal modulation and demodulation. An optical communication relay system is built to achieve communication networking. Experimental results show that the system can achieve point-to-multipoint FSO communication, and using ADC for demodulation improves the stability of the system. This system provides a design prototype for FSO communication networking technology.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Qingwang Min, Penghua Miao, Jinghan Liu, Jianjun Ma, Meijuan Qi, Farzaneh Shamsa
Summary: A simple and facile approach was conducted to prepare a series of new SBA-15 supported dendritic imidazolium ILs heterogeneous catalysts with high ionic density. Among these catalysts, SBA-15/IL(3) showed the highest catalytic activity for solvent-free synthesis of 2-imidazolidinone from ethylenediamine and carbon dioxide, with a positive dendritic influence on reaction yields due to the high-density peripheral zwitterionic ionic liquid functional groups on the biobased catalyst surfaces.
Article
Engineering, Aerospace
Chi Peng, Jianjun Ma, Xiaoma Liu
Summary: In this article, an online robust actor-critic-disturbance guidance law is developed for a missile-target interception system with limited normal acceleration capability. The key is to seek the saddle point solution of the Hamilton Jacobi Isaacs (HJI) equation and construct critic NN, actor NN, and disturbance NN based on Neural Networks (NNs). The proposed scheme is proved to be Uniformly Ultimately Bounded (UUB) stable by Lyapunov method and its effectiveness and robustness are illustrated through numerical simulations.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Geochemistry & Geophysics
Xiangzhu Meng, Peian Li, Yuning Hu, Fei Song, Jianjun Ma
Summary: Recognition of road surface conditions using low-THz frequencies is important for transportation safety and efficiency. The theoretical model developed in this study combines IEM, RTE, and Rayleigh scattering theory, showing good agreement between calculation results and measured data. The influence of carrier frequency, ambient temperature, impurities in the ice layer, and frozen soil surface conditions on the method's efficiency is discussed.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Engineering, Chemical
Jinlei Zeng, Yue Yang, Yibo Tang, Xu Xu, Xu Chen, Ganlu Li, Kequan Chen, Hui Li, Pingkai Ouyang, Weimin Tan, Jianjun Ma, Yaozong Liu, Ruiyuan Liang
Summary: The study shows that the new green biobased PDI trimer curing agent has lower carbon emissions and similar performance compared to petrochemical-based HDI trimer curing agents. By optimizing the synthesis, modification, and removal of free PDI monomers, self-made and allophanate-modified PDI isocyanurate trimers exhibit excellent physical and chemical properties, with water resistance, acid and alkali resistance, and aging resistance comparable to or even better than petrochemical-based HDI products.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Endocrinology & Metabolism
Zhiwei Liu, Tao Wu, Shanjin Ma, Wei Xue, Xiaoye Jiang, Qisheng Tang, Jianjun Ma
Summary: This study aimed to evaluate the accuracy of two modes of Rigiscan in predicting tadalafil response and identify the most efficient Rigiscan variables in making these predictions. The results showed that NPTR had a higher area under the curve (AUC) than AVSS in predicting tadalafil responders, while AVSS had a higher AUC than NPTR in predicting cured patients.
FRONTIERS IN ENDOCRINOLOGY
(2022)
Editorial Material
Physics, Multidisciplinary
Jianjun Ma, Yuping Yang, Bin Li, Hichem Guerboukha
FRONTIERS IN PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Jianjun Ma, Miao Zhu, Yunwei Li, Xu Cai
Summary: This article proposes the concept of monopolar fault reconfiguration for bipolar dc distribution system and presents the design and evaluation of a Bipolar Half Bridge (BiHB) converter. The proposed converter achieves mode switching by reconfiguring the switching pattern, and a bipolar modulation method is used for control design considering both monopolar and bipolar working mode. The key factor influencing transient voltage spikes, including fault detection delay and modulation method, is identified, and feed-forward compensation is adopted to suppress voltage spikes caused by monopolar fault. The proposed concept and strategy have been validated through fault protection and restoration tests, ensuring uninterrupted power supply.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yang Chen, Han Wang, Miao Zhu, Jianjun Ma, Xiangping Kong
Summary: This paper introduces an improved multi-port modular multilevel converter for the interconnection of low frequency AC transmission system. Through the analysis of topology and working principle, a partitioned nearest level modulation method is proposed for high-voltage applications, and a mathematical model and decoupling control strategy are presented. To solve the output performance issues for hybrid HVAC and LFAC scenarios, an output current distortion suppression strategy and a circulating current control strategy are proposed.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Optics
Xiang Gao, Huanxin LI, Ting Zhang, Jia Du, Ken Smart, Jianjun Ma, Jianping An
Summary: This paper presents a 600 GHz high-temperature superconducting sub-harmonic mixer with a double-Y-type slot antenna and a cascaded filter network. The experimental results show that the mixer achieves the best performance among similar frequency and operating temperature conditions.
Article
Engineering, Aerospace
Chi Peng, Hanwen Zhang, Yongxiang He, Jianjun Ma
Summary: This article proposes a state-following-kernel-based reinforcement learning method for a missile-target interception system. By estimating the target maneuver, the critic and actor neural networks are constructed using state-following kernels to calculate the approximate optimal guidance policy. Numerical simulations highlight the importance of state-following kernels in value function and policy approximation.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Peian Li, Jianchen Wang, Liangbin Zhao, Xiang Gao, Fei Song, Houjun Sun, Jianjun Ma
Summary: Wireless communication at terahertz frequencies is considered as a potential for future 6G wireless systems. However, secure data transmission in these systems faces complex challenges, including the less explored threat of scattering-induced eavesdropping. In this study, we investigate the security implications of scattering in non-line-of-sight (NLOS) links using metallic wavy surfaces and demonstrate real-time data transmission with a high data rate. We find that signal interception from an NLOS link can occur even with transceiver designs incorporating backscatter measures, posing a common security threat for THz communication systems with NLOS channels.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Peian Li, Jiancheng Wang, Liangbin Zhao, Jianjun Ma, Houjun Sun, Lothar Moeller, John F. Federici
Summary: The increasing capacity demand in wireless connectivity can be met by terahertz communications in the 100 GHz to 10 THz band. However, the performance of terahertz channels in outdoor adverse weather conditions is not well-studied. In this article, the performance of terahertz channels in emulated rain is reported, showing that raindrop size distribution uncertainty is a major factor affecting power attenuation and bit error rate.
NANO COMMUNICATION NETWORKS
(2023)
Article
Energy & Fuels
Yang Chen, Jinggang Yang, Yang Xu, Chuanchuan Hou, Ke Zhao, Jianjun Ma, Miao Zhu
Summary: AC & DC hybrid power grid is an important trend in renewable energy systems, and the power electronic transformer plays a crucial role in the conversion and transmission of renewable energy. Existing topologies have drawbacks such as large volume and complex control. The TP-MMC, with a compact structure and multiple AC and DC ports, provides a solution for the interconnection of AC and DC power grids. The proposed voltage source control strategy in this paper enhances the inertial and self-synchronous ability of the AC port in TP=MMC, allowing flexible control of active and reactive power.
Article
Chemistry, Multidisciplinary
Menghan Wei, Peian Li, Yuanshuai Lei, Xiue Bao, Jianjun Ma
Summary: This article investigates the potential of millimeter-wave (MMW) and sub-terahertz (sub-THz) frequency bands in mobile communication technology, focusing on the biothermal heating effect of human skin under high-power illumination. The research shows that these frequency bands are non-ionizing and safe for humans at low illumination powers. However, the concern remains on biothermal heating at high power. An analysis is conducted in outdoor environments considering atmospheric conditions, using a theoretical model combining Pennes' bioheat transfer equation, the ITU model, and the Mie scattering theory. The influence of factors such as rainfall rate, humidity, operating frequency, illumination time, power density, and propagation distance is discussed.
APPLIED SCIENCES-BASEL
(2023)
Proceedings Paper
Engineering, Industrial
Zhaoxin Du, Jianjun Ma, Kehuan Wang, Ning Gao, Miao Zhu
Summary: This paper proposes a topology of fault current limiting partial power converter to solve the DC short-circuit fault problem of the dc-dc converter.
2022 IEEE 17TH CONFERENCE ON INDUSTRIAL ELECTRONICS AND APPLICATIONS (ICIEA)
(2022)
