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IEEE International Wireless Symposium (IWS)

作者： Wenyu Hao Fan He Zheng Ye Jianjun Jiang Xiao Ji School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China National Key Laboratory of Electromagnetic Effect and Security on Marine Equipment Wuhan China

ISBN: (数字)9798350389999

ISBN: (纸本)9798350390001

This paper presents a novel broadband quasi-elliptical bandpass frequency selective surface (FSS) for radome applications. The proposed FSS consists of a periodic array of patch with the stub-loaded resonator in pieces of double-layer printed circuit boards, which are connected by via through the ground and then stacked together with a certain distance. The simulation results show that the −1.5 dB transmission bandwidth is 8.21 ~ 11.66 GHz, and two transmission zeros are outside of a passband. This configuration enables FSS to facilitate broadband transmission and high selectivity.

关键词： Frequency selective surfaces Wireless communication Simulation Filtering theory Broadband communication Radomes Broadband antennas Passband Sandwich structures Wideband

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Large bandwidth and high efficiency silicon nitride grating coupler with bottom reflector 3

Large bandwidth and high efficiency silicon nitride grating ...

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3rd International Conference on Laser, Optics, and Optoelectronic technology, LOPET 2023

作者： Chen, Haihong Zhang, Weilun Chen, Yang Ye, Mengyuan Yu, Yu Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan430074 China School of Automation China University of Geosciences Wuhan430074 China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan430074 China

ISBN: (纸本)9781510667624

Grating coupler, one of the essential devices in silicon-based optical integrated chip, is still suffering with low coupling efficiency and small operation bandwidth. In this paper, we design and experimentally demonstrate a silicon nitride (Si3N4) grating coupler with high coupling efficiency and large bandwidth. Instead of using bottom distributed Bragg reflector, metal mirror or other complex designs, a bottom silicon grating reflector based on a 220 nm industrially standard silicon-on-insulator wafer is employed to improve coupling efficiency and simplify the fabrication processes. The interlayer coupler enables the light transmission between Si3N4 and Si waveguides. By optimizing structure parameters and apodizing the Si3N4 grating coupler, a high coupling efficiency of -2.37 dB and large 1-dB bandwidth of 53 nm are obtained. © 2023 SPIE.

关键词： Silicon nitride

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Thermal camera based on frequency upconversion and its NETD characterization

arXiv

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arXiv 2023年

作者： Ge, Zheng Zhou, Zhi-Yuan Ceng, Jing-Xin Chen, Li Li, Yin-Hai Li, Yan Niu, Su-Jian Shi, Bao-Sen CAS Key Laboratory of Quantum Information University of Science and Technology of China Anhui Hefei230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

We present a scheme for estimating the noise-equivalent temperature difference (NETD) of frequency upconversion detectors (UCDs) that detect mid-infrared (MIR) light. In particular, this letter investigates the frequency upconversion of a periodically polarized crystal based on lithium niobate, where a mid-infrared conversion bandwidth of 220 nm can be achieved in a single poled period by a special design. Experimentally for a temperature target with a central wavelength of 7.89 μm in mid-infrared radiation, we estimated the NETD of the device to be 56 mK. Meanwhile, a direct measurement of the NETD was performed utilizing conventional methods, which resulted in 48 mK. We also compared the NETD of our UCD with commercially available direct mid-infrared detectors. Here, we showed that the limiting factor for further NETD reduction of our device is not primarily from the upconversion process and camera noise, but from the limitations of the heat source performance. Our detectors have good temperature measurement performance and can be used for a variety of applications involving temperature object identification and material structure detection. Copyright © 2023, The Authors. All rights reserved.

关键词： Temperature measurement

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100 km Discrete-Modulated Continuous-Variable Quantum key Distribution Using Probabilistic Shaped 16QAM

100 km Discrete-Modulated Continuous-Variable Quantum Key Di...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Yan Pan Mingze Wu Heng Wang Yun Shao Jinlu Liu Yang Li Yichen Zhang Wei Huang Bingjie Xu National Key Laboratory of Security Communication Institute of Southwestern Communication Chengdu China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China

We first experimentally demonstrated discretemodulated continuous-variable quantum key distribution over 100.93 km of standard single-mode fiber using probabilistic shaped 16QAM. The results show that a secret key rat... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Protocols Noise reduction Asia Estimation Probabilistic logic optical fiber communication Quantum key distribution System analysis and design Standards Photonics

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Bayesian Framework for Multi-User Cooperative Radio SLAM 35

Bayesian Framework for Multi-User Cooperative Radio SLAM

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35th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2024

作者： Que, Hang Yang, Jie Du, Tao Xia, Shuqiang Wen, Chao-Kai Jin, Shi Southeast University National Mobile Communications Research Laboratory Nanjing211189 China Southeast University Frontiers Science Center for Mobile Information Communication and Security Nanjing210096 China Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Nanjing210096 China Zte Corporation Shenzhen518001 China State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen518001 China Institute of Communications Engineering National Sun Yat-sen University Kaohsiung804 Taiwan

ISBN: (纸本)9798350362244

The advancement of millimeter-wave communication technology heralds new sensing capabilities. By leveraging channel multipath parameter estimates, we can harness simultaneous localization and mapping (SLAM) for precise user equipment (UE) localization and radio map construction in 6 G communication systems. Particularly in multi-UE scenarios, SLAM empowers base stations to amalgamate the local radio maps of various UEs efficiently. This study introduces a novel Bayesian framework specifically designed for multi-UE SLAM, complemented by a tailored factor graph. We also unveil a two-stage multi-UE SLAM algorithm. Our simulation results reveal that this algorithm substantially enhances radio map construction accuracy by 4 8. 5 % and UE localization accuracy by 13.5 %, outperforming single-UE cases. Moreover, the algorithm demonstrates remarkable adaptability to environmental changes, showcasing its potential for long-term evolution in dynamic settings. © 2024 IEEE.

关键词： Long Term Evolution (LTE)

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A Data Association Method Based on Azimuth Inverse Cotangent Value

A Data Association Method Based on Azimuth Inverse Cotangent...

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International Youth Conference on Radio electronics, Electrical and Power Engineering (REEPE)

作者： Nan Zou Muze Yin Guangpu Zhang Zhenqi Yang Pengbo Ma Dongyu Li National Key Laboratory of Underwater Acoustic Technology Harbin Engineering University Harbin China Key Laboratory of Marine Information Acquisition and Security (Harbin Engineering University) Ministry of Industry and Information Technology Harbin China College of Underwater Acoustic Engineering Harbin Engineering University Harbin China Science and Technology on Electronic Information Control Laboratory Chengdu China

ISBN: (数字)9798331531836

ISBN: (纸本)9798331531843

In this paper, we address the challenge of data association in scenarios involving multiple observers for underwater non-cooperative localization, where it is unclear how measurement data from different stations corresponds to the same target. We propose a novel data association method that leverages the inverse cotangent of azimuthal sequence features. The method first calculates the sequence of cotangent values measured by each station's bearing in a limited time. Linearly analyzes the sequence to obtain the slope, and finally realizes the data association according to the characteristic that the inverse cotangent value of the slope corresponds to the target's motion heading. The simulation results show that the proposed method has better association localization ability compared with the traditional method, overcomes the problem of the conventional method that the computational volume is too large when the number of observation stations and targets is large, and ensures the association correctness under a certain error.

关键词： Location awareness Power engineering Accuracy Azimuth Simulation Noise Observers Time measurement

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A Low-loss X-band Frequency-Selective Rasorber

A Low-loss X-band Frequency-Selective Rasorber

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IEEE International Conference on electronic information and Communication technology (ICEICT)

作者： Fan He Wenyu Hao Xiao Ji National Key Laboratory of Electromagnetic Effect and Security on Marine Equipment China Ship Development and Design Center WuHan China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350384437

ISBN: (纸本)9798350384444

This paper proposes a wideband and low insertion loss frequency-selective Rasorber (FSR). The proposed FSR structure consists of windmill-shaped resistive absorbers and double-layer square-ring frequency selective surfaces. The absorber layer incorporates a U-shaped metal structure that acts as an LC parallel resonator, achieving wideband electromagnetic wave transmission. Simulation results show that this FSR design has -1 dB insertion loss from 8.0 to 12.2 GHz, with a minimum of -0.4 dB. A wideband FSR was fabricated and measured to validate the design.

关键词： Resistors Frequency selective surfaces Simulation Resonant frequency Metals Insertion loss Reliability engineering

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Fabrication of lithium niobate metasurfaces via a combination of FIB and ICP-RIE

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Chinese Optics Letters 2022年第11期20卷 95-99页

作者： Chunyan Jin Wei Wu Lei Cao Bofeng Gao Jiaxin Chen Wei Cai Mengxin Ren Jingjun Xu Key Laboratory of Weak-Light Nonlinear Photonics Ministry of EducationSchool of Physics and TEDA Applied Physics InstituteNankai UniversityTianjin 300071China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300308China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Lithium niobate(LN)metasurfaces have emerged as a new platform for manipulating electromagnetic ***,we report a fabrication technique for LN nano-grating metasurfaces by combining focused ion beam(FIB)milling with inductively coupled plasma reactive ion etching(ICP-RIE).Steep sidewalls with angles larger than 80°are *** quasi-bound states in the continuum are observed from our *** measured transmission spectra show good agreement with the numerical simulations,confirming the high quality of the fabricated *** technique can be applied to fabricate the LN metasurfaces with sharp resonances for various applications in optical communications,on-chip photonics,laser physics,sensing,and so on.

关键词： lithium niobate metasurfaces fabrication FIB ICP-RIE

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QS-Dijkstra: A Safety-Enhanced Routing Algorithm on SDN Framework 10

QS-Dijkstra: A Safety-Enhanced Routing Algorithm on SDN Fram...

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10th International Conference on Internet Computing for science and Engineering, ICICSE 2021

作者： Zhao, Jinjing Pang, Ling Wang, Zibin Zhong, Wenjing Xin, Qin National Key Laboratory of Science and Technology on Information System Security China China Electro-Mechanical Engineering Xidian University China Faculty of Science and Technology University of the Faroe Islands Denmark

ISBN: (纸本)9781450384957

We consider the security problems in Dijkstra caused by routing on the vulnerable communication links. This work employs a SDN framework to mitigate the vulnerable links while maintaining satisfactory QoS request. SDN is able to maintain an overall network awareness, through which a controller is capable of optimizing routing based on metrics of safety interest. A lot of useful link information, like link type, link ownership, interface bandwidth, transition delay and historical record, can be collected and computed by the SDN controller to enable more safe, reliable and efficient paths. In this way, we can consider the varying delay status of the communication network along with other network security parameters and get a presence of a passive/active adversary in the network routing area. The implement and experiment indicate that QS-Dijkstra algorithm is able to minimize traffic routing through vulnerable links while satisfying the QoS constraints of the network. © 2021 ACM.

关键词： Network security

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QS-Dijkstra: A Safety-Enhanced Routing Algorithm on SDN Framework 2021

QS-Dijkstra: A Safety-Enhanced Routing Algorithm on SDN Fram...

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2021 10th International Conference on Internet Computing for science and Engineering

作者： Jinjing Zhao Ling Pang Zibin Wang Wenjing Zhong Qin Xin National Key Laboratory of Science and Technology on Information System Security China China Electro-Mechanical Engineering Xidian University China and National Key Laboratory of Science and Technology on Information System Security China China Faculty of Science and Technology University of the Faroe Islands Denmark

ISBN: (纸本)9781450384957

关键词： routing protocol QoS network security Dijkstra algorithm SDN

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