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Compact and Tunable Mid-IR Light Source Based on a Dual-Wavelength Fiber Laser

Chinese Physics Letters 2013年第11期30卷 106-108页

作者： CHANG Jian-Hua WANG Ting-Ting ZHANG Chuang GE Yi-Xian TAO Zai-Hong Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science&TechnologyNanjing 210044 Jiangsu Technology&Engineering Center of Meteorological Sensor Network Nanjing University of Information Science&TechnologyNanjing 210044

A compact,tunable mid-IR difference-frequency generation(DFG)light source based on a dual-wavelength fiber laser and a 5mol%MgO-doped periodically poled lithium niobate(MgO:PPLN)crystal is developed and *** output power of 233μW is achieved with a conversion efficiency of 0.1%/*** mid-IR wavelength can be tuned between 3308 nm and 3314 nm by changing the temperature of a pair of fiber Bragg grating(FBG)taking as cavity mirrors in the dual-wavelength fiber laser from 26.5°C to 106.5°C.

关键词： fiber tunable Dual

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Generalized Metasurface Design for Polarization Reconstruction in a Single Snapshot

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Journal of Lightwave technology 2025年

作者： Xu, Wenhui Li, Hui Liu, Yufei Li, Jie Tan, Qi Xu, Hang Zhang, Yan Yao, Jianquan Tianjin University Key Laboratory of Opto-Electronics Information Technology Ministry of Education School of Precision Instruments and Opto-Electronics Engineering Tianjin300072 China Capital Normal University Beijing Key Laboratory for Metamaterials and Devices Key Laboratory of Terahertz Optoelectronics Ministry of Education Beijing Advanced Innovation Center for Imaging Technology Department of Physics Beijing100048 China Chengdu University of Information Technology Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center Chengdu610225 China

Metasurfaces enable the design of compact devices that can detect polarization with high precision. This capability is highly significant in applications where space and weight are constraints, such as in portable sensors, optical systems, or communications. Nevertheless, traditional metasurface-based polarization measurement techniques may not work efficiently at terahertz (THz) frequencies due to the different behavior of THz waves compared to visible light. In this work, we propose and experimentally demonstrate a design strategy for THz polarization recognition that utilizes all-dielectric metasurface. This approach necessitated only the extraction of the electric field distribution at the focal plane in the transmission mode. The focal spot located at the center of the focal plane carries orbital angular momentum (OAM), which assisted in determining the azimuthal angle of the incident polarization state. Furthermore, off-axis focal spot positioned in four quadrants provided additional information regarding ellipticity and enable characterization of both axis ratio and the handedness of the polarization ellipse. The pivotal information delineated by the Stokes parameter S3, the axial ratio (AR), and ellipticity (χ) can effectively identify arbitrary polarization states that encompass the entire surface of Poincaré sphere. The consistency between the experimental and simulated results confirms the effectiveness of the designed metasurface in accurately reconstructing THz polarization states. The ability of the designed metasurface to manipulate and detect polarization states with high precision can improve performance in imaging, sensing, and communication systems. © 1983-2012 IEEE.

关键词： Spin polarization

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Explosive synchronization in a mobile network in the presence of a positive feedback mechanism

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Chinese Physics B 2022年第1期31卷 187-191页

作者： Dong-Jie Qian Jiangsu Provincial Sensor Network Engineering Technology Research Center Wuxi Institute of TechnologyWuxi 214121China

Synchronization is a process that describes the coherent dynamics of a large ensemble of interacting *** study of explosive synchronization transition attracts considerable ***,I report the explosive transition within the framework of a mobile network,while each oscillator is controlled by global-order parameters of the *** numerical simulation,I find that the explosive synchronization(ES)transition behavior can be controlled by simply adjusting the fraction of controlled *** influences of some parameters on explosive synchronization are ***,due to the presence of the positive feedback mechanism,I prevent the occurrence of the synchronization of continuous-phase transition and make phase transition of the system a first-order phase transition accompanied by a hysteresis loop.

关键词： complex network explosive synchronization positive feedback mobile agent

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A class of asymptotic solution for the time delay wind field model of an ocean

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Chinese Physics B 2014年第4期23卷 83-90页

作者：周先春石兰芳莫嘉琪 College of Electronic and Information Engineering Nanjing University of Information Science and Technology (NUIST) Jiangsu Technology and Engineering Center for Meteorological Sensor Network Nanjing University of Information Science and Technology (NUIST) Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology (NUIST) College of Mathematics and Statistics Nanjing University of Information Science and Technology (NUIST)

A time delay model of a two-layer barotropic ocean with Rayleigh dissipation is built. Using the improved perturba- tion method, an analytic asymptotic solution of a better approximate degree is obtained in the mid-la... 详细信息

关键词： two-layers barotropic time delay model asymptotic method

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An enhanced grouping proof for multiple rfid readers and tag groups

International Journal of Control and Automation

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International Journal of Control and Automation 2014年第12期7卷 239-246页

作者： Shen, Jian Tan, Haowen Wang, Yang Ji, Sai Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing China Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China School of Computer and Software Nanjing University of Information Science and Technology Nanjing China

RFID authentication on large numbers of tags or tag groups has attracted many researchers' attention as an extension of initial one-or-two-tags scenarios. Due to demands of RFID application in supply chain, various proofs are proposed in the purpose of solving existing problems of grouping tags identification. However, it is proved that verifiers in these proofs are not aware of abnormal relating devices instantly, which may cause both security and technical risks and lie heavy upon identification of the problematic tags and readers. In this paper, we propose an enhanced grouping proof for multiple RFID readers and tag groups, according to which the verifier is able to cope with multiple readers and tag groups simultaneously and know the detailed status of the problematic tags. In addition, privacy protection is provided by offering mutual authentication between the readers and tags. Moreover, it is hard for the malicious tags to pass the verification in the proposed proof. © 2014 SERSC.

关键词： Supply chains

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Adaptive Rake receiver joined with chip equalization for DS-CDMA UWB systems over ISI channels

Adaptive Rake receiver joined with chip equalization for DS-...

引用

2012 International Workshop on Information and Electronics engineering, IWIEE 2012

作者： Wang, Feng Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing 210044 China

Since there is much larger channel delay spread, there is serious inter-symbol interference (ISI) when ultrawideband (UWB) wireless communication systems work at high data speed. The serious ISI affects the performance of UWB systems seriously. In this paper, a scheme to suppress ISI is developed for direct sequence spread-code division multiple access (DS-CDMA) UWB systems with a high data speed and an adaptive joint chip equalization Rake (AJCE-Rake) receiver is proposed. The proposed AJCE-Rake receiver spreads the number of traditional Rake receiver taps to collect multi-path component and equalize the inter-chip interference simultaneously. Then the soft output of AJCE-Rake receiver is despreaded with the user's spreading code. Finally, the decision is made to recover the transmitted symbol. The simulation results verify that ISI is suppressed effectively and the system performance is improved evidently. © 2011 Published by Elsevier Ltd.

关键词： Code division multiple access

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Homotopic mapping solitary traveling wave solutions for the disturbed BKK mechanism physical model

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Chinese Physics B 2014年第9期23卷 54-59页

作者：周先春石兰芳韩祥临莫嘉琪 College of Electronic and Information Engineering Nanjing University of Information Science and Technology Jiangsu Technology and Engineering Center for Meteorological Sensor Network Nanjing University of Information Science and Technology Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology College of Mathematics and Statistics Nanjing University of information Science and Technology Department of Mathematics Huzhou Teachers College Department of Mathematics Anhui Normal University

Using the trial equation method, a Broer-Kau-Kupershmidt （BKK） mechanism physical model is obtained, and the exact and approximate solitary traveling wave solutions are found. As an example, it is pointed out that t... 详细信息

关键词： nonlinear solitary traveling wave

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An Incentive Mechanism Considering Privacy Metric for Personalized Application

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IEEE Transactions on Consumer Electronics 2025年

作者： Xie, Yun Li, Peng Zhang, Jindan Attar, Razaz Waheeb Arya, Varsha Gupta, Brij B. Nanjing Vocational College of Information Technology Jiangsu Province Service Customization Network Application Engineering Research Center Jiangsu Province Service Customization Network Application Engineering Research Center Nanjing210023 China Nanjing University of Posts and Telecommunications School of Computer Science Nanjing210023 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing210023 China Xianyang Polytechnic Institute China Princess Nourah bint Abdulrahman University College of Business Administration Management Department Riyadh11671 Saudi Arabia Hong Kong Metropolitan University Hong Kong Hong Kong Center for Interdisciplinary Research Dehradun India Asia University Department of Computer Science and Information Engineering Taichung413 Taiwan China Medical University Hospital China Medical University Department of Medical Research Taichung Taiwan Pune India Korea University School of Cybersecurity Seoul Korea Republic of Kyung Hee University Kyungheedae-ro Seoul26 Korea Republic of

Edge-based federated learning (EFL) is a solution for personalized applications. It addresses the limitations of cloud-based consumer service systems, such as data privacy and network latency. To further enhance the EFL system’s ability to protect data privacy, differential privacy (DP) is introduced. It is crucial to motivate high-quality collaboration among participants for optimal performance of the DP-EFL system. Researchers primarily focus on efficient learning algorithms, optimized resource scheduling, and user-oriented incentive mechanisms. Existing research exhibits notable limitations in modeling and analyzing the heterogeneity of resource costs (e.g., communication costs), particularly failing to comprehensively account for the additional costs imposed by participants’ privacy protection mechanisms‌. To address this gap, we propose a novel market transaction model based on Stackelberg game theory. This framework integrates incentive-driven reward allocation mechanisms to rigorously investigate the collaborative behaviors and strategic interactions between edge nodes (ENs) and the cloud server (CS)‌. We incorporate privacy costs into the multidimensional costs of participants with privacy metric, and based on this, derived collaboration strategies between ENs and CS, thus solving the Stackelberg game problem by theoretical analysis. Furthermore, numerical experiments validated the rationality of our proposed model, the impact of strategies on the performance of collaborators, and the advantages over other incentive mechanisms. © 2025 IEEE. All rights reserved.

关键词： Federated learning

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Application of composite hermitian operator eigenfunctions on analysis of RCS

Application of composite hermitian operator eigenfunctions o...

引用

2016 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2016

作者： Wang, You-Bao Wang, Xiang Rao, Yue-Fei Xiao, Shun Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing210044 China

ISBN: (纸本)9781467381949

The technique to integrate the composite hermitian operator eigenfunctions (CHOEs) with the general asymptotic waveform evaluation (GAWE) is proposed for computing the radar cross section (RCS) of a perfect electric conductor (PEC). In the analysis, the orthogonal and complete properties of the CHOEs are used to construct the solution space of a matrix equation. Hence, the solution of the equation can be obtained by combining the based-vectors of the solution space with a set of coefficients, which can be determined by the GAWE technique at a given frequency. The results of numerical examples prove that the novel technique is effective in computing RCS. © 2016 IEEE.

关键词： Radar cross section

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Design and optimization of CMOS LNA with ESD protection for 2.4 GHz WSN application

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Journal of Semiconductors 2011年第10期32卷 103-112页

作者：李智群陈亮张浩 Institute of RF-& OE-ICs Southeast University RFIC and System Engineering Research Center of Ministry of Education of China Southeast University Research Center of Sensor Network Technology Southeast University

A new optimization method of a source inductive degenerated low noise amplifier（LNA） with electrostatic discharge protection is *** can achieve power-constrained simultaneous noise and input matching. An analysis of the input impedance and the noise parameters is also *** on the developed method,a 2.4 GHz LNA for wireless sensor network application is designed and optimized using 0.18-μm RF CMOS technology. The measured results show that the LNA achieves a noise figure of 1.59 dB,a power gain of 14.12 dB, an input 1 dB compression point of-8 dBm and an input third-order intercept point of 1 *** DC current is 4 mA under a supply of 1.8 V.

关键词： LNA ESD protection noise and input impedance matching CMOS

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