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International Conference on Electronic Engineering and Informatics (EEI)

作者： Wanwan Xing Anqi Hu Xingye Zhou Xia Guo State Key Laboratory for Information Photonics and Optical Communications School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing China National Key Laboratory of Solid-State Microwave Devices and Circuits Hebei Semiconductor Research Institute Shijiazhuang China

Avalanche photodiodes working in Geiger mode can realize single photon detection and play important roles in fields of quantum communication, imaging and Lidar system, et al. To keep the device intact and detect the photon signals in time, quenching and reset circuit is a necessary module. In this paper, an active quenching and reset circuit is designed. The circuit achieves voltage feedback by combining analog and digital modules to quench and reset APD, which effectively reduces the dead time. Experimental results show that the dead time of the active circuit is reduced by more than ten times compared with the passive circuit. The circuit is beneficial to improve the detection efficiency and design better detection system.

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Secrecy outage analysis of mixed RF-FSO downlink SWIPT systems

arXiv

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arXiv 2018年

作者： Lei, Hongjiang Dai, Zhijun Park, Ki-Hong Lei, Weijia Pan, Gaofeng Alouini, Mohamed-Slim Chongqing Key Lab of Mobile Communications Technology Chongqing University of Posts and Telecommunications Chongqing400065 China Thuwal23955-6900 Saudi Arabia Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing Southwest University Chongqing400715

We analyze a secure dual-hop mixed radio frequency-free space optical (RF-FSO) downlink simultaneous wireless information and power transfer (SWIPT) systems. The FSO link and all RF links experience Gamma-Gamma, independent and identical Nakagami-mfading, *** analyze the effects of atmospheric turbulence, pointing error, detection technology, path loss, and energy harvesting on secrecy performance. Signal-to-noise ratios at both legitimate and illegitimate receivers are not independent since they are both simultaneously influenced by the FSO link. We derive the closedform expression of the secrecy outage probability (SOP) as well as the asymptotic result for SOP when signal-to-noise ratios at relay and legitimate destinations tend to infinity. Monte-Carlo simulations are performed to verify the accuracy of our analysis. The results show that the secrecy diversity order (SDO) depends on the fading parameter of the relay-destination link and the number of the destination's antennas. Additionally, the SDO also depends on the fading parameters, the pointing error parameter, and the detection type of the FSO link. Copyright © 2018, The Authors. All rights reserved.

关键词： Monte Carlo methods

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EEG-based Emotion Recognition on Unstable Patterns over Time

EEG-based Emotion Recognition on Unstable Patterns over Time

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International Conference on Digital Home (ICDH)

作者： Guopei Wu Sheng Qin Yuling Luo Qiang Fu Jin Zeng Su Yang Junxiu Liu Guangxi Key Lab of Brain-inspired Computing and Intelligent Chips School of Electronic and Information Engineering Guangxi Normal University Guilin China Education Department of Guangxi Zhuang Autonomous Region Key Laboratory of Nonlinear Circuits and Optical Communications (Guangxi Normal University) Guilin China Department of Computer Science Swansea University UK

ISBN: (数字)9798331509873

ISBN: (纸本)9798331509880

In brain-computer interface (BCI) systems, users' emotion can be recognized by using electroencephalography (EEG) data. Recent researches proposed different methods for feature extraction and EEG-based emotion classification. However, EEG data collected over time is not always stable and accuracies of emotion recognition are found not robust. In this paper, a novel EEG emotion recognition system is proposed by combining ReliefF for extracting features, and Long Short-Term Memory Network coupled with Support Vector Machine for classification. A public EEG emotion dataset of SEED which contains three different recordings of EEG data is used in the experiments. It is shown that the proposed network is effective for mitigating the phenomenon of unstable accuracies, and achieves higher emotion classification accuracies compared to other approaches using the same dataset.

关键词： Support vector machines Emotion recognition Accuracy Feature extraction Electroencephalography Brain-computer interfaces Recording Classification algorithms Long short term memory Biological neural networks

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Great chiral fluorescence from optical duality silver nanostructures enabled by 3D laser printing

arXiv

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arXiv 2020年

作者： Wen, Hongjing Song, Shichao Xie, Fei Wang, Bin Xu, Jian Feng, Ziwei Wu, Shiyu Han, Jing Guan, Baiou Xu, Xiaoxuan Cao, Yaoyu Li, Xiangping Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics Technology Jinan University Guangzhou511443 China Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education School of Physics Nankai University Tianjin300071 China

Featured by prominent flexibility and fidelity in producing sophisticated stereoscopic structures transdimensionally, three-dimensional (3D) laser printing technique has vastly extended the toolkit for delivering diverse functional devices. Yet chiral nanoemitters heavily resorting to artificial structures that manifest efficient emission and tightly confined light-mater interactions simultaneously remains alluring but dauntingly challenging for this technique at this moment. In this work, we assert the chiral photoluminescence is implemented from silver nanostructures of optical duality in one go via a twofold three-dimensional laser printing scheme. Such laser printing protocol allows the highly desired duality by simultaneously producing uniformly distributed fluorescent silver nanoclusters and aggregated plasmonic silver nanoparticles to tightly confine chiral interactions at the nanoscale. A helical emitter of 550 nm-helix-diameter as fabricated has seen a record-high luminescence anisotropic factor with the absolute value up to 0.58, which is two orders of magnitude greater than fluorescent chiral silver clusters. This method holds great promise for future versatile applications in chiroptical nanodevices. Copyright © 2020, The Authors. All rights reserved.

关键词： Fluorescence

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Single-microresonator-based dynamic photonic molecule switch

Single-microresonator-based dynamic photonic molecule switch

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Tao, Zihan Shen, Bitao Li, Wencan Xing, Luwen Wang, Haoyu Wu, Yichen Tao, Yuansheng Zhou, Yan He, Yandong Peng, Chao Shu, Haowen Wang, Xingjun State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing100871 China College of Engineering Peking University Beijing100871 China School of Integrated Circuits Peking University Bejing100871 China Peking University Yangtze Delta Institute of Optoelectronics Nantong226010 China Frontiers Science Center for Nano-optoelectronics Peking University Beijing100871 China Peng Cheng Laboratory Shenzhen518055 China

We propose a dynamic on-chip photonic molecule switch in an ultra-compact multimode silicon microring, allowing for flexible either nonlinear control or loss reduction. This strategy leads to a record low-loss transit... 详细信息

关键词： Molecules

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Single-microresonator-based dynamic photonic molecule switch

Single-microresonator-based dynamic photonic molecule switch

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Photonic devices

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Effect of Proton Irradiation on the Structure and Optoelectronic Properties of Ga2o3 Films with Diverse Crystalline Phases

SSRN

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SSRN 2023年

作者： Yue, Jianying Qi, Song Ji, Xueqiang Qi, Xiaohui Liu, Jiahang Wu, Zhenping Li, Peigang Tang, Weihua Laboratory of Information Functional Materials and Devices School of Science State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China School of Integrated Circuits State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications Nanjing210023 China

As Ga2O3-based devices are used as critical materials in defence and military applications, the reliability of materials and devices faces significant challenges from complex irradiation environments. In this study, β-Ga2O3 and e-Ga2O3 epitaxial films were grown on (0001)-oriented c-Al2O3 substrates via metal-organic chemical vapor deposition (MOCVD). We have investigated and compared the variation in the crystal quality and optoelectronic properties of β-Ga2O3 and e-Ga2O3 materials and photodetectors irradiated by protons at an energy of 100 MeV and with an irradiation dose of 1x1011. The XRD rocking curve and AFM results show that as compared to β-Ga2O3, e-Ga2O3 has no significant variations in crystal quality and surface morphology after irradiation, hence e-Ga2O3 film has greater irradiation hardness. The photovoltaic properties indicate an dramatic increase in β-Ga2O3 dark current after irradiation, in contrast to e-Ga2O3. These findings may be attributed to e-Ga2O3's high symmetry space group structure, which results in superior epitaxial films. Nevertheless, the β-Ga2O3-based photodetector remain possesses an unbeatable light-to-dark ratio (PDCRs) of 1.8×105 and excellent detectivity of 3.4×1016 Jones after irradiation. These explorations will be instructive for the application of Ga2O3 in the harsh environment of space ionising radiation. © 2023, The Authors. All rights reserved.

关键词： Gallium compounds

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On outage of dual-hop relay SWIPT system with antenna selection and GSC over Nakagami-m fading channels

On outage of dual-hop relay SWIPT system with antenna select...

引用

International Conference on Communication Systems

作者： Danyang Wang Han Yu Jiliang Zhang Gaofeng Pan Hongjiang Lei Tingting Li Yunfei Chen Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing SWU Chongqing China Chongqing Key Lab of Mobile Communications Technology CQUPT Chongqing China School of Mathematics and Statistics Southwest University Chongqing China School of Engineering University of Warwick Coventry UK

ISBN: (纸本)9781509034246

In this paper, a wireless powered dual-hop relay system, which consists of a source, a destination and a relay equipped with N R (N R > 1) receiving antennas, is considered. Antenna selection scheme is employed for the relay to harvest energy from the received signals, under which the L R (0 R ≤ N R ) strongest received signals are combined for information processing and the others L Z = N R - L R copies of signals are used for energy harvesting. Considering Nakagami-m fading scenarios, we first derive the closed-form expressions for the probability density function and the cumulative distribution function of the signal-to-noise ratio with ascending generalized selection combining, and then the closed-form analysis expression for the outage probability is derived. Finally, simulation results are presented to verify our proposed analysis model.

关键词： Relays Fading channels Diversity reception Receiving antennas Transmitting antennas IP networks Wireless communication

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Characteristic Particle Swarm Optimization Algorithm for Nanophotonic Inverse Design with the Grating Coupler Design as an Application Case

Characteristic Particle Swarm Optimization Algorithm for Nan...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Enge Zhang Junjing Huang Tongxin Yang Liuwei Chen Xiaoran Zhu Shiqi Zhang Xiaofeng Duan Lei Zhang School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China School of Sciences Beijing University of Posts and Telecommunications Beijing China

We propose the characteristic particle swarm optimization (CPSO) for the inverse design of nanophotonic devices. Compared with the traditional PSO algorithm, the proposed method has fewer variables and thus a faster rise speed. It can break through the limitations brought by traditional PSO algorithm to obtain better device performance. We verify the feasibility of the CPSO through the design of a silicon-on-insulator grating coupler. The CPSO is suitable for the design of nanophotonic devices with large parameter space.

关键词： Performance evaluation Couplings Silicon-on-insulator Couplers Wavelength division multiplexing Silicon photonics Nanoscale devices

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Chirped Bright and Kink Solitons in nonlinear optical Fibers with Weak Nonlocality and Cubic-Quantic-Septic nonlinearity

引用

Chinese Physics Letters 2022年第4期39卷 12-16页

作者： Qin Zhou Yu Zhong Houria Triki Yunzhou Sun Siliu Xu Wenjun Liu Anjan Biswas Research Center of Nonlinear Science School of Mathematical and Physical SciencesWuhan Textile UniversityWuhan 430200China Radiation Physics Laboratory Department of PhysicsFaculty of SciencesBadji Mokhtar UniversityP.O.Box 1223000 AnnabaAlgeria School of Electronic and Information Engineering Hubei University of Science and TechnologyXianning 437100China State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China Beijing University of Posts and Telecommunications Research Institute Shenzhen 518057China Department of Physics Chemistry and MathematicsAlabama A&M UniversityNormalAL 35762-4900USA Mathematical Modeling and Applied Computation(MMAC)Research Group Department of MathematicsKing Abdulaziz UniversityJeddah 21589Saudi Arabia

This work focuses on chirped solitons in a higher-order nonlinear Schrodinger equation,including cubic-quinticseptic nonlinearity,weak nonlocal nonlinearity,self-frequency shift,and self-steepening *** the first time,analytical bright and kink solitons,as well as their corresponding chirping,are *** influence of septic nonlinearity and weak nonlocality on the dynamical behaviors of those nonlinearly chirped solitons is thoroughly *** findings of the study give an experimental basis for nonlinear-managed solitons in optical fibers.

关键词： effect nonlinearity solitons

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