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Silicon photonics for high-capacity data communications

Photonics Research 2022年第9期10卷 I0002-I0030页

作者： YAOCHENG SHI YONG ZHANG YATING WAN YU YU YUGUANG ZHANG XIAO HU XI XIAO HONGNAN XU LONG ZHANG BINGCHENG PAN Centre for Optical and Electromagnetic Research State Key Laboratory for Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityZijingang CampusHangzhou 310058China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Institute for Energy Efficiency University of California Santa BarbaraSanta BarbaraCalifornia 93106USA Electrical and Computer Engineering Department King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Wuhan National Laboratory for Optoelectronics&School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China National Information Optoelectronics Innovation Center China Information and Communication Technologies Group Corporation(CICT)Wuhan 430074China State Key Laboratory of Optical Communication Technologies and Networks China Information and Communication Technologies Group Corporation(CICT)Wuhan 430074China Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong KongChina

In recent years,optical modulators,photodetectors,(de)multiplexers,and heterogeneously integrated lasers based on silicon optical platforms have been *** performance of some devices even surpasses the traditional III-V and photonic integrated circuit(PIC)platforms,laying the foundation for large-scale photonic *** photonic technology can overcome the limitations of traditional transceiver technology in high-speed transmission networks to support faster interconnection between data *** this article,we will review recent progress for silicon *** first part gives an overview of recent achievements in silicon *** second part introduces the silicon photonic building blocks,including low-loss waveguides,passive devices,modulators,photodetectors,heterogeneously integrated lasers,and so *** the third part,the recent progress on high-capacity silicon photonic transceivers is *** the fourth part,we give a review of high-capacity silicon photonic networks on chip.

关键词： interconnection passive networks

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MHD simulations of cold bubble formation from 2/1 tearing mode during massive gas injection in a tokamak

arXiv

引用

arXiv 2020年

作者： Zeng, Shiyong Zhu, Ping Izzo, V.A. Li, Haolong Jiang, Zhonghe Department of plasma physics and fusion engineering University of Science and Technology of China Anhui Hefei230026 China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Fiat Lux San DiegoCA United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

Massive gas injection (MGI) experiments have been carried out in many tokamaks to study disruption dynamics and mitigation schemes. Two events often observed in those experiments are the excitation of the m = 2, n = 1 magnetohydrodynamic (MHD) mode, and the formation of cold bubble structure in the temperature distribution before the thermal quench (TQ). Here m is the poloidal mode number, n the toroidal mode number. The physics mechanisms underlying those phenomena, however, have not been entirely clear. In this work, our recent NIMROD simulations of the MGI process in a tokamak have reproduced the main features of both events, which has allowed us to examine and establish the causal relation between them. In these simulations, the 3/1 and 2/1 islands are found to form successively after the arrival of impurity ion cold front at the corresponding q = 3 and q = 2 rational surfaces. At the interface between impurity and plasma, a local thin current sheet forms due to an enhanced local pressure gradient and moves inward following the gas cold front, this may contribute to the formation of a dominant 2/1 mode. Following the growth of the 2/1 tearing mode, the impurity penetration into the core region inside the q = 2 surface gives rise to the formation of the cold bubble temperature structure and initiates the final TQ. A subdominant 1/1 mode developed earlier near the q = 1 surface alone does not cause such a cold bubble formation, however, the exact manner of the preceding impurity penetration depends on the nature of the 1/1 mode: kink-tearing or quasi-interchange. Copyright © 2020, The Authors. All rights reserved.

关键词： Magnetoplasma

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MHD simulations of cold bubble formation from 2/1 tearing mode during massive gas injection in a tokamak

Research Square

引用

Research Square 2021年

作者： Zeng, Shiyong Zhu, Ping Izzo, V.A. Li, Haolong Jiang, Zhonghe Department of Plasma Physics and Fusion Engineering University of Science and Technology of China Anhui Hefei230026 China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Fiat Lux San DiegoCA United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

关键词： Bubble formation

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Study on the relationship between the size of resin sprue on GIS and intensity of UHF electromagnetic waves radiated from partial discharge

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2014年 29卷 531-536页

作者： Wu, Siyang Ye, Qizheng Li, Xingwang Wang, Zengbin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou510600 China

Gas insulated switchgear (GIS) of different manufacturers have different size of resin sprue, and the size of resin sprue has direct effects on the ultra-high-frequency (UHF) electromagnetic waves motivated by partial discharge (PD), which brings about many difficulties in accurate estimate of the severity of PD. On the platform of a 252 kV GIS, we used UHF sensors which were mounted on resin sprues of different size that had been set up in advance to detect electromagnetic wave signals emitted by the needle-plane PD model in GIS and found that with an increase of the length of the long side of the sprue, the signal intensity enhances first and weakens later and get its maximum on 75 mm. Another simulation experiment which used pulse signal generator to provide excitation source for the transmitting antenna in GIS to simulate PD and detected signals in the same way to the former also found the same conclusion. The calculation results in XFDTD--an electromagnetic wave simulation software based on finite difference time domain (FDTD) method also proved the same conclusion. This conclusion offers important references for the options of the best size of resin sprue and development of external UHF sensor. ©, 2014, Diangong Jishu Xuebao/Transactions of China Electrotechnical Society. All right reserved.

关键词： Partial discharges

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Oscillator death induced by amplitude-dependent coupling in repulsively coupled oscillators

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Physical Review E 2015年第5期91卷 052902-052902页

作者： Weiqing Liu Guibao Xiao Yun Zhu Meng Zhan Jinghua Xiao Jürgen Kurths School of Science Jiangxi University of Science and Technology Ganzhou 341000 People's Republic of China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Science Beijing University of Posts and Telecommunications Beijing 100876 China Institute of Physics Humboldt University Berlin Berlin D-12489 Germany Potsdam Institute for Climate Impact Research Telegraphenberg Potsdam D-14415 Germany

The effects of amplitude-dependent coupling on oscillator death (OD) are investigated for two repulsively coupled Lorenz oscillators. Based on numerical simulations, it is shown that as constraint strengths on the amplitude-dependent coupling change, an oscillatory state may undergo a transition to an OD state. The parameter regimes of the OD domain are theoretically determined, which coincide well with the numerical results. An electronic circuit is set up to exhibit the transition process to the OD state with an amplitude-dependent coupling. These findings may have practical importance on chaos control and oscillation depression.

关键词： DYNAMICAL systems CHAOS synchronization PHASE transformations (Physics) LORENZ equations COUPLING constants (Nuclear physics) AMPLITUDE estimation

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Nonsingular Terminal Sliding Mode Control for Speed Regulation of Permanent Magnet Synchronous Motor with Parameter Uncertainties and Torque Change

Nonsingular Terminal Sliding Mode Control for Speed Regulati...

引用

International Conference on Electrical Machines and Systems

作者： Wei Xu Yajie Jiang Chaoxu Mu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Electrical and Automation Engineering Tianjin University Tianjin China

ISBN: (纸本)9781479988068

This paper mainly studies the speed control for a permanent magnet synchronous motor (PMSM) system with parameters uncertainties and torque change. PMSM is a typical nonlinear multivariable coupled system, and is sensitive to the load disturbance and the changing of motor parameters. Hence, the drive performance of PMSM is deteriorated when faced with all kinds of disturbances. A new control algorithm based on nonsingular terminal sliding mode control (NTSMC) is designed to replace the traditional sliding mode control (SMC) in this paper, which can provide effective control for the speed regulation of PMSM servo system with parameter uncertainties and torque change. The high performance in simulation results are proposed to verify the effectiveness of this proposed method.

关键词： PMSM NTSMC SMC

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Mechanically reprogrammable Pancharatnam-Berry metasurface for microwaves

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advanced Photonics 2022年第1期4卷 69-79页

作者： Quan Xu Xiaoqiang Su Xueqian Zhang Lijuan Dong Lifeng Liu Yunlong Shi Qiu Wang Ming Kang Andrea Alù Shuang Zhang Jiaguang Han Weili Zhang Tianjin University Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringKey Laboratory of Optoelectronic Information Technology(Ministry of Education of China)TianjinChina Shanxi Datong University Institute of Solid State Physics and College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsDatongChina Wuhan University of Technology School of Information EngineeringWuhanChina Tianjin Normal University College of Physics and Materials ScienceTianjinChina City University of New York Advanced Science Research CenterPhotonics InitiativeNew YorkUnited States City University of New York Graduate CenterPhysics ProgramNew YorkUnited States University of Hong Kong Faculty of ScienceDepartment of PhysicsHong KongChina University of Hong Kong Department of Electrical and Electronic EngineeringHong KongChina Guilin University of Electronic Technology Guangxi Key Laboratory of Optoelectronic Information ProcessingSchool of Optoelectronic EngineeringGuilinChina Oklahoma State University School of Electrical and Computer EngineeringStillwaterOklahomaUnited States

Metasurfaces have enabled the realization of several optical functionalities over an ultrathin platform,fostering the exciting field of flat *** metasurfaces are achieved by arranging a layout of static meta-atoms to imprint a desired operation on the impinging wavefront,but their functionality cannot be *** and programmability of metasurfaces are the next important step to broaden their impact,adding customized on-demand functionality in which each meta-atom can be individually *** demonstrate a mechanical metasurface platform with controllable rotation at the meta-atom level,which can implement continuous Pancharatnam–Berry phase control of circularly polarized *** the proof-of-concept experiments,we demonstrate metalensing,focused vortex beam generation,and holographic imaging in the same metasurface template,exhibiting versatility and superior *** dynamic control of electromagnetic waves using a single,low-cost metasurface paves an avenue towards practical applications,driving the field of reprogrammable intelligent metasurfaces for a variety of applications.

关键词： reprogrammable metasurfaces Pancharatnam-Berry phase mechanical metasurfaces microwaves

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Target-Oriented WiFi Sensing for Respiratory Healthcare: from Indiscriminate Perception to In-Area Sensing

引用

IEEE Network 2024年

作者： Wang, Meng Huang, Jinyang Zhang, Xiang Liu, Zhi Li, Meng Zhao, Peng Yan, Huan Sun, Xiao Dong, Mianxiong Hefei University of Technology Anhui Province Key Laboratory of Affective Computing and Advanced Intelligence Machine School of Computer and Information Hefei230601 China University of Science and Technology of China CAS Key Laboratory of Electromagnetic Space Information Hefei230026 China The University of Electro-Communications Department of Computer and Network Engineering Tokyo1828585 Japan Guizhou Normal University School of Big Data and Computer Science Guiyang550025 China Muroran Institute of Technology Department of Sciences and Informatics 0508585 Japan

Driven by the vision of integrated sensing and communication (ISAC) toward 6G technology, the WiFi-based respiration sensing approach has emerged as a highly competitive candidate for advanced healthcare services. Nevertheless, the indiscriminate perception of all the moving objects within the sensing area raises challenges for system stability and robustness for real-world deployment, especially for the susceptibility to motion interference from other people. Meanwhile, thanks to the emerging in-area wireless sensing technologies, i.e., beamforming, the dynamic environment tolerance of these technologies gives crucial opportunities for target-oriented WiFi-based healthcare services. This article discusses the compelling intersection of in-area WiFi sensing and the future of target-oriented intelligent respiratory healthcare network services. We first present a novel WiFi-based healthcare-assisting framework tailored for inter-user motion interference-tolerable (IMIT) sensing. The detailed components of low-level signal preprocessing, target-direction signal extraction, and healthcare-related services are discussed. By utilizing CSI beamforming technology, which adjusts a directional beam toward the desired direction and adaptively places beam nulls in noisy directions, we can mitigate motion interference and achieve target-oriented healthcare sensing. Finally, we discuss open challenges and potential solutions for target-oriented WiFi healthcare sensing. © 1986-2012 IEEE.

关键词： Wireless local area networks (WLAN)

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Measuring Near-Field Radiative Heat Transfer in a Graphene-SiC Heterostructure

引用

Physical Review Applied 2023年第2期19卷 024019-024019页

作者： Naeem Iqbal Sen Zhang Shuai Wang Zezheng Fang Yaoyuan Hu Yongdi Dang Minjie Zhang Yi Jin Jianbin Xu Binfeng Ju Yungui Ma State Key Lab of Modern Optical Instrumentation Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou China The State Key Lab of Fluid Power Transmission and Control School of Mechanical Engineering Zhejiang University Hangzhou China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou China Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong China

Near-field radiative heat transfer between closely placed objects may exceed the far-field black-body radiation limit by orders of magnitude, especially between polaritonic materials. Great efforts have been made to experimentally measure this fundamental effect in various systems. In this work, we manage to experimentally characterize the near-field thermal emission between less explored plasmon-phonon hybrid material systems made of a graphene-SiC heterostructure. The experiment is carried out using a custom-designed all-optical measurement setup. A heat flux enhancement factor of 26 over the black-body radiation limit is obtained at a 150-nm vacuum gap. Three fundamental modes, i.e., surface plasmon and phonon polaritons with frustrated modes, are identified to contribute the near-field heat flux in this hybrid system. The measured results are well reproduced from the analytical calculations, indicating the robustness of the measurement. Deeper experimental explorations for near-field heat transfer between more complicated material systems could be encouraged in the future.

关键词： Energy harvesting devices Heat transfer Near-field optics Surface plasmon polariton Graphene Van der Waals systems Optical techniques

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Network-constrained transactive control for multi-microgrids-based distribution networks with SOPs

arXiv

引用

arXiv 2020年

作者： Yang, Xiaodong Song, Zehao Wen, Jinyu Xu, Chongbo Wu, Qiuwei Zhang, Youbing Zhang, Menglin Cheng, Shijie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China College of Information Engineering Zhejiang University of Technology Hangzhou310023 China Center for Electric Power and Energy Department of Electrical Engineering Technical University of Denmark Kongens Lyngby2800 Denmark School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Center for Electric Power and Energy Department of Electrical Engineering Technical University of Denmark Kongens Lyngby2800 Denmark

Different from most transactive control studies only focusing on economic aspect, this paper develops a novel network-constrained transactive control (NTC) framework that can address both economic and secure issues for a multi-microgrids-based distribution network considering uncertainties. In particular, we innovatively integrate a transactive energy market with the novel power-electronics device (i.e., soft open point) based AC power flow regulation technique to improve economic benefits for individual microgrids and meanwhile ensure the security of the entire distribution network. In this framework, a dynamic two-timescale NTC model consisting of slow-timescale pre-scheduling and real-time scheduling stages is formulated to work against multiple system uncertainties. Moreover, the original bilevel game problems are transformed into single-level mixed-integer second-order cone programming problems through KKT conditions, duality, linearization and relaxation techniques to avoid iterations of transitional methods, so as to improve computational efficiency. Finally, numerical simulations on a modified 33-bus test system with 3 MGs verify the effectiveness of the proposed framework. Copyright © 2020, The Authors. All rights reserved.

关键词： Power markets

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