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Deterministic and Stochastic Simulators for Non-Isotropic V2V-MIMO Wideband Channels

China communications 2018年第7期15卷 18-29页

作者： Yiran Li Xiang Cheng Nan Zhang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Wireless Algorithm Department Product Research and Development System ZTE Corporation

In this paper, we consider a novel two-dimensional(2D) geometry-based stochastic model(GBSM) for multiple-input multiple-output(MIMO) vehicle-to-vehicle(V2V) wideband fading channels. The proposed model employs the combination of a two-ring model and a multiple confocal ellipses model, where the signal is sum of the line-of-sight(Lo S) component, single-bounced(SB) rays, and double-bounced(DB) rays. Based on the reference model, we derive some expressions of channel statistical properties, including space-time correlation function(STCF), Doppler spectral power density(DPSD), envelope level crossing rate(LCR) and average fade duration(AFD). In addition, corresponding deterministic and stochastic simulation models are developed based on the reference model. Moreover, we compare the statistical properties of the reference model and the two simulation models in different scenarios and investigate the impact of different vehicular traffic densities(VTDs) on the channel statistical properties of the proposed model. Finally, the great agreement between simulation models and the reference model demonstrates not only the utility of simulation models, but also the correctness of theoretical derivations and simulations.

关键词： vehicle-to-vehicle wideband channels simulation model statistical properties

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16×112Gb/s single-sideband PAM4 WDM transmission over 80km SSMF with Kramers-Kronig receiver

16×112Gb/s single-sideband PAM4 WDM transmission over 80km ...

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optical Fiber communication Conference, OFC 2018

作者： Zhu, Yixiao Jiang, Mingxuan Ruan, Xiaoke Li, Chenjia Zhang, Fan State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing100871 China

Based on Kramers-Kronig receiver and phase alignment operation, we demonstrate 16-channel 56Gbaud single-sideband PAM4 WDM transmission over 80km SSMF. Single channel 80km transmission of 80Gbaud SSB-PAM4 signal is al... 详细信息

ISBN: (纸本)9781943580385

关键词： Light transmission

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High-speed faster-than-nyquist optical transmission

High-speed faster-than-nyquist optical transmission

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Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Zhang, Fan Zhu, Yixiao Wang, Pengfei Yang, Chuanchuan State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing100871 China

Faster-than-Nyquist (FTN) signaling is discussed both theoretically and experimentally. Several schemes of FTN signal generation and reception are compared with emphasize on high-speed transmission with 16-QAM format.... 详细信息

ISBN: (纸本)9781943580453

关键词： Light transmission

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High-speed optical transmission with single-sideband modulation

High-speed optical transmission with single-sideband modulat...

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Signal Processing in Photonic communications, SPPCom 2018

作者： Zhang, Fan Zhu, Yixiao Jiang, Mingxuan State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing100871 China

ISBN: (纸本)9781943580439

关键词： Modulation

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Superhigh-Resolution Recognition of optical Vortex Modes Assisted by a Deep-Learning Method

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Physical Review Letters 2019年第18期123卷 183902-183902页

作者： Zhanwei Liu Shuo Yan Haigang Liu Xianfeng Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China

Orbital angular momentum (OAM) has demonstrated great success in the optical communication field, which theoretically allows an infinite increase of the transmitted capacity. The resolution of a receiver to precisely recognize OAM modes is crucial to expand the communication capacity. Here, we propose a deep learning (DL) method to precisely recognize OAM modes with fractional topological charges. The minimum interval recognized between adjacent modes decreases to 0.01, which as far as we know is the first time this superhigh resolution has been realized. To exhibit its efficiency in the optical communication process, we transfer an Einstein portrait by a superhigh-resolution OAM multiplexing system. As the convolutional neuron networks can be trained by data up to an infinitely large volume in theory, this work exhibits a huge potential of generalized suitability for next generation DL based ultrafine OAM optical communication, which might even be applied to microwave, millimeter wave, and terahertz OAM communication systems.

关键词： Angular momentum of light Geometrical & wave optics optical vortices

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Single-Photon Transport in a Topological Waveguide from a Dynamically Modulated Photonic system

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Physical Review Applied 2020年第1期14卷 014063-014063页

作者： Luojia Wang Luqi Yuan Xianfeng Chen Shanhui Fan State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University Jinan 250358 China Department of Electrical Engineering and Ginzton Laboratory Stanford University Stanford California 94305 USA

The topologically protected one-way edge modes for light show a way to manipulate the interaction between a single photon and a quantum emitter. We systematically study single-photon quantum optics in a topological waveguide supporting the frequency-dependent one-way edge mode at the boundary of a dynamically modulated photonic system, and compare the results of the single-photon interacting dynamics with the quantum emitter in a unidirectional waveguide. As a major difference, a photon in a topological waveguide propagates around the resonant site coupled to the quantum emitter due to the topological protection. Our results show that, despite different subtleties, photon-emitter interactions for one photon at the edge mode and for one photon propagating in a unidirectional waveguide hold similar features. In addition, we consider the interaction between the photon and a Λ-type three-level quantum emitter in the topological waveguide, where we show the nonlocal correlated photon-state generation as well as the single-photon reflection with the frequency conversion. Our work provides insight for understanding the interaction between the topologically protected unidirectional-propagating photon and the quantum emitter, which holds promise for potential applications in quantum-information processing.

关键词： Edge states optical quantum information processing Quantum correlations in quantum information Quantum optics Single photon sources Topological effects in photonic systems Waveguides 2-dimensional systems

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Femtosecond fiber laser at 780 nm for two-photon autofluorescence imaging

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Chinese Optics Letters 2019年第7期17卷 63-65页

作者： Wan Yang Danlei Wu Runlong Wu Guanyu Liu Bingying Chen Lishuang Feng Zhigang Zhang Aimin Wang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing 1008711 China Key Laboratory of Precision Opto-Mechatronics Technology Ministry of EducationSchool of Instrumentation Science&Optoelectronics EngineeringBeihang UniversityBeijing 100191China

We present an Er-doped fiber(Er:fiber)-based femtosecond laser at 780 nm with 256 MHz repetition rate, 191 fs pulse duration, and over 1 W average *** from the careful third-order dispersion management, we introduce moderate self-phase modulation to broaden the output spectrum of the Er:fiber amplifier and achieve 193 fs pulse duration and 2.43W average *** 40% frequency doubling efficiency is obtained by a periodically poled lithium niobate *** through a hollow-core photonic bandgap fiber, this robust laser becomes an ideal and convenient light source for two-photon autofluorescence imaging.

关键词： Femtosecond fiber laser two-photon autofluorescence imaging

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Active spoof plasmonic resonator based on metal-insulator-metal structure 5

Active spoof plasmonic resonator based on metal-insulator-me...

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5th IEEE International Conference on Computational Electromagnetics, ICCEM 2019

作者： Li, Qiao Yu Cai, Jing Zhou, Yong Jin School of Communication and Information Engineering Shanghai University Shanghai200444 China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai200444 China State Key Laboratory of Transducer Technology Chinese Academy of Sciences Shanghai200050 China

ISBN: (纸本)9781538671115

An active spoof plasmonic resonator is proposed, which mainly loads the microwave active amplifier chip on the metal-insulator-metal (MIM) resonator. It was expected that the losses of the structure could be compensated by adjusting the biased voltage of the chip, so as to improve the resonant strength and quality factor of the resonator. Although the simulation and experimental results of the passive structures agree well, the results of the active structure when the biased voltage is applied did not match expectations and the Q factor of only one mode is improved. More works will be done to further improve the performances. © 2019 IEEE.

关键词： Metal insulator boundaries

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Boosting higher secret key rate in quantum key distribution over mature telecom components

Research Square

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Research Square 2021年

作者： Wang, Tao Huang, Peng Li, Lang Zhou, Yingming Zeng, Guihua State Key Laboratory of Advanced Optical Communication Systems and Networks Center for Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai200240 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Hefei National Laboratory CAS Center for Excellence in Quantum Information and Quantum Physics Anhui Hefei230026 China Shanghai XunTai Quantech Co. Ltd Shanghai200241 China

Secret key rate is a core performance indicator in implementing quantum key distribution, which directly determines the transmission rate of enciphered data. Here we demonstrate a high-key-rate quantum key distribution system over mature telecom components. The entire framework of quantum key distribution over these components is constructed. The high-rate low-noise Gaussian modulation of coherent states is realized by a classical electro-optic IQ modulator. High-baud low-intensity quantum signals are received by a commercial integrated coherent receiver under the shot-noise limit. A series of digital signal processing algorithms are proposed to achieve accurate signal recovery and key distillation. The system has yield a secret key rate of 10.37 Mbps, 1.61 Mbps, 337.82 kbps, and 58.06 kbps under the standard telecom fiber of 20 km, 50 km, 70 km, and 100 km, respectively. Our results represent the achieved highest secret key generation rate for quantum key distribution using continuous variables at a standard telecom wavelength. Moreover, it breaks the isolation between quantum communication and classical optical communication in terms of components, and opens the way to a high-speed and cost-effective formation of metropolitan quantum secure communication networks. © 2021, CC BY.

关键词： Quantum cryptography

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Metasurface-assisted passive wireless communication with commodity wi-fi signals

arXiv

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arXiv 2020年

作者： Zhao, Hanting Shuang, Ya Wei, Menglin Cui, Tie Jun del Hougne, Philipp Li, Lianlin State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University Beijing100871 China State Key Laboratory of Millimeter Waves Southeast University Nanjing210096 China Institut de Physique de Nice CNRS UMR 7010 Université Côte d'Azur Nice06108 France

Wireless communication has become a standard solution to address ever-increasing demands for information transfer in our modern society. Conventional systems work in an active way in the sense that an active carrier signal is mandatorily required to transfer information from Alice to Bob. Especially in the era of 5G/6G and with the advent of the Internet of Things (IoT), an exponential growth of users and connectivity confronts conventional systems with important challenges including limited spectrum resources, information security, energy consumption and cost efficiency. Here, we introduce the fundamentally different concept of passive wireless communication (PWC) which has the potential to resolve the above-mentioned issues. PWC transfers digital information by modulating/demodulating already existing omnipresent ambient stray electromagnetic waves using a programmable metasurface. We provide a theoretical framework for encoding/decoding and modulating/demodulating in PWC and build a proof-of-principle prototype system leveraging existing commodity 2.4GHz Wi-Fi signals. We demonstrate information transfer from Alice to Bob with data rates on the order of hundreds of Kbps using distinguishable information-carrying control coding patterns of the metasurface, neither necessitating an active carrier signal and its associated radio-frequency chain nor affecting the background active wireless communication. The presented strategy is particularly appealing for "green" IoT connectivity. At the same time, the concept is applicable to all types of wave phenomena and provides a fundamentally new perspective on the design of future wireless communication architectures. Copyright © 2020, The Authors. All rights reserved.

关键词： Internet of things

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