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2021 optical Fiber communications Conference and Exhibition, OFC 2021

作者： Lun, Huazhi Liu, Xiaomin Cai, Meng Wu, Yiwen Fu, Mengfan Yi, Lilin Hu, Weisheng Zhuge, Qunbi Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai200240 China

We propose a GAN based soft failure detection and identification algorithm. For the training, the detection and identification only need normal samples and very few soft failure samples, respectively. 95% accuracy is ... 详细信息

ISBN: (纸本)9781943580866

关键词： optical fibers

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Gbps key rate passive-state-preparation continuous-variable quantum key distribution within an access-network area

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Photonics Research 2024年第7期12卷 1485-1493页

作者： FEIYU JI PENG HUANG TAO WANG XUEQIN JIANG GUIHUA ZENG State Key Laboratory of Advanced Optical Communication Systems and Networks Center for Quantum Sensing and Information ProcessingSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China College of Information Science and Technology Donghua UniversityShanghai 201620China

The conventional Gaussian-modulated coherent-state quantum key distribution(QKD) protocol requires the sender to perform active modulations based on a true random number generator. Compared with it, the passive-state-preparation(PSP) continuous-variable quantum key distribution(CVQKD) equivalently performs modulations passively by exploring the intrinsic field fluctuations of a thermal source, which offers the prospect of chip integration QKD with low cost. In this paper, we propose and experimentally demonstrate a high-rate PSP-CVQKD scheme within an access-network area using high-bandwidth detectors in a continuous wave encoding and decoding way. By proposing effective methods for suppressing the noises during the PSP process and polarization multiplexing to decrease the photon leakage noises, we realize the high-intensity local oscillator transmission, thereby achieving coherent detection with high efficiency, low noise, and high bandwidth. The secure key rates over transmission distance of 5.005 km with and without consideration of the finite-size effect are 273.25 Mbps and 1.09 Gbps. The use of the PSP method boosts the asymptotic secret key rate of CVQKD to Gbps level for the first time, to our knowledge, within the range of the access network, which provides an effective and secure key distribution strategy for high-speed quantum cryptography access communication.

关键词： passive network distribution

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Beyond 300Gb/s from an integrated single-channel silicon photonics modulator driver combination

Beyond 300Gb/s from an integrated single-channel silicon pho...

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IEEE International Conference on Group IV Photonics

作者： Ke Li David J. Thomson Lingjun Zhou Weiwei Zhang Shenghao Liu Wei Cao Callum G. Littlejohns XingZhao Yan Martin Ebert Mehdi Banakar Dehn Tran Fanfan Meng Lei Wang Zhixue He Fan Zhang Shaohua Yu Graham T. Reed Peng Cheng Laboratory Shenzhen China Silicon Photonics Group Optoelectronics Research Centre University of Southampton Southampton UK State Key Laboratory of Advanced Optical Communication System and Networks Frontiers Science Center for Nano-Optoelectronics School of Electronics Peking University Beijing China

ISBN: (数字)9798350394047

ISBN: (纸本)9798350394054

We investigate the performance boundary of integrated CMOS silicon photonics transmitters by using optical equalisation techniques. Without using any off-line DSP techniques at the receiver side, experimental results demonstrate 182Gbps OOK and 308Gbps PAM-4 transmissions with the energy efficiency including driver, of better than 1pJ/bit.

关键词： Integrated optics Silicon photonics CMOS technology optical receivers Energy efficiency optical transmitters optical modulation

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Agile dispersion engineering of photonic waveguides by using neural network aided inverse design 26

Agile dispersion engineering of photonic waveguides by using...

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26th Optoelectronics and communications Conference, OECC 2021

作者： Wang, Zhaonian Du, Jiangbing Shen, Weihong Liu, Jiacheng Xu, Ke He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China Shenzhen518055 China

A photonic design automation method for agile dispersion engineering of photonic waveguides is demonstrated by using neural network aided inverse design. Broadband low dispersion, wideband maintained constant dispersi... 详细信息

ISBN: (纸本)9781557528209

关键词： Inverse problems

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Broadband infinite-Q plasmons enable intense Smith–Purcell radiation

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Photonics Research 2023年第11期11卷 1945-1958页

作者： ZI-WEN ZHANG CHAO-HAI DU YU-LU LEI JUAN-FENG ZHU PU-KUN LIU Center for Carbon-based Electronics School of ElectronicsPeking UniversityBeijing 100871China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China Science Mathematics and Technology(SMT)Singapore University of Technology and DesignSingapore 487372Singapore

With the rapid development of nanophotonics for enhancing free-electron radiation,bound states in the continuum(BICs)have emerged as a promising approach for emitting intense Smith–Purcell radiation(SPR)with enhanced ***,current BIC-based methods are limited to single-frequency operation,thereby restricting their applications requiring spectral and angular tunability,such as particle detectors and light *** overcome this limitation,this work proposes an approach for constructing plasmonic BICs over a broad spectral range in symmetry-broken *** leveraging the high-Q resonances near the BICs,we achieve intense SPR with broadband tunability,potentially improving the radiation intensity by six orders compared to traditional ***,we validate the construction of BIC using plasmonic antennas and achieve broadband *** proposed concept can be extended to other plasmonic or guided-wave systems,paving the way toward compact and efficient free-electron sources in hard-to-reach frequency regimes.

关键词： intense infinite enable

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Plasmonic vortex beam emitter

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Photonics Research 2023年第10期11卷 1723-1732页

作者： ZI-WEN ZHANG YU-LU LEI JUAN-FENG ZHU CHAO-HAI DU Center for Carbon-based Electronics School of ElectronicsPeking UniversityBeijing 100871China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China Science Mathematicsand Technology(SMT)Singapore University of Technology and DesignSingapore 487372Singapore

Terahertz vortices prompt numerous advanced applications spanning classical and quantum communications,sensing, and chirality-based detection, owing to the inherent physical properties of terahertz waves and orbital angular momentum(OAM). Nonetheless, existing methodologies for generating terahertz vortices face challenges such as unalterable topological charges and intricate feed networks. To address these limitations, we propose a novel approach to generate multi-mode and tunable vortex beams based on chiral plasmons. Through eigenmode analysis, the uniform helical gratings are demonstrated to support chiral plasmons carrying OAM. By leveraging their vortex characteristics and introducing modulation into the periodic system, these chiral plasmons are alternatively diffracted into high-purity vortex radiations according to the Bragg law. To validate the theory, the vortex beam emitter is fabricated and measured in the microwave regime based on the modulated scheme. Experimental results confirm the emission of vortex beams with desirable phase distributions and radiation patterns. Our findings highlight the potential of chiral plasmons as seeds for tunable and compact vortex radiation, offering promising applications in tunable vortex sources.

关键词： emitter tunable vortex

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Scanning-free Brillouin optical time domain analyzer with single-end access

Scanning-free Brillouin optical time domain analyzer with si...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Linjing Huang Xinyu Fan Zuyuan He Department of Electronic Engineering State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China Peng Cheng Laboratory Shenzhen China

We propose a scanning-free BOTDA system with single-end access by employing the Rayleigh backscattering lightwave of a linear frequency modulated optical pulse as the probe wave to simplify the system and increase the... 详细信息

ISBN: (纸本)9781957171258

关键词： Absolute distance measurement Backscattering Brillouin scattering Stimulated Brillouin scattering Stimulated scattering Strain measurement

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Emerging material platforms for integrated microcavity photonics

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Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 10-28页

作者： Jin Liu Fang Bo Lin Chang Chun-Hua Dong Xin Ou Blake Regan Xiaoqin Shen Qinghai Song Baicheng Yao Wenfu Zhang Chang-Ling Zou Yun-Feng Xiao State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510000China MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300071China State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China CAS Key Lab of Quantum Information University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Functional Material for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Mathematical and Physical Sciences University of Technology SydneyUltimo 2007Australia School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Many breakthroughs in technologies are closely associated with the deep understanding and development of new material *** the main material used in microelectronics,Si also plays a leading role in the development of integrated *** indirect bandgap,absence ofχ(2)nonlinearity and the parasitic nonlinear absorptions at the telecom band of Si imposed technological bottlenecks for further improving the performances and expanding the functionalities of Si microcavities in which the circulating light intensity is dramatically *** past two decades have witnessed the burgeoning of the novel material platforms that are compatible with the complementary metal-oxide-semiconductor(COMS)*** particular,the unprecedented optical properties of the emerging materials in the thin film form have resulted in revolutionary progress in microcavity *** this review article,we summarize the recently developed material platforms for integrated photonics with the focus on chip-scale microcavity *** material characteristics,fabrication processes and device applications have been thoroughly discussed for the most widely used new material *** also discuss open challenges and opportunities in microcavity photonics,such as heterogeneous integrated devices,and provide an outlook for the future development of integrated microcavities.

关键词： microcavity integrated optics nonlinear optics

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Meta-Critic Reinforcement Learning for IOS-Assisted Multi-User communications in Dynamic Environments

Meta-Critic Reinforcement Learning for IOS-Assisted Multi-Us...

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IEEE Conference on Vehicular Technology (VTC)

作者： Qinpei Luo Boya Di Zhu Han State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Electrical and Computer Engineering Department University of Houston TX USA

Capable of reflecting and refracting the incident signals on both sides simultaneously, the intelligent omnidirectional surface (IOS) has recently been proposed as a promising solution to enhance the capacity of wireless networks. However, the large number of IOS elements brings a heavy burden to the beamforming scheme design, especially for applications that require a fast response to varying environments. In this paper, aiming to maximize the sum rate of an IOS-aided multi-user system via IOS-enabled beamforming design that can rapidly adapt to dynamic channel states and user mobility, we develop a novel meta-critic reinforcement learning framework where a meta-critic network recognizes the environment change and automatically re-trains of the learning model. A stochastic Explore and Reload procedure is tailored to reduce the high-dimensional action space problem. Simulation results show the proposed scheme can converge to a higher sum rate more rapidly compared to the benchmark methods in dynamic settings. The robustness of our scheme against different IOS sizes is also verified.

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Enhanced sensitivity via polarization switching in fiber-based quantum sensing

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Physical Review Applied 2023年第4期20卷 044020-044020页

作者： Xiaorui Tan Hongjing Li Qi Song Binke Xia Tailong Xiao Shurong Wei Jingzheng Huang Guihua Zeng State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronic Information and Electrical Engineering Institute of Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China

Quantum sensing has performance advantages that far exceed classical sensing, where sensing with photons is one of the most useful branches, and fiberization is a significant development approach to achieve a broader range of applications. However, the birefringence effect in optical fibers can cause polarization drift, which severely reduces the sensitivity of measurement on weak signals and influences the development of quantum sensing. In order to solve this problem, we propose a scheme that builds four time-division-multiplexing channels in the system by switching the polarization states of different optical pulses, and achieves the effect of suppressing polarization drift by analyzing and integrating the effective information of the four polarization channels. Moreover, the sensitivity and linear dynamic range of the system can be adjusted by inserting a reference phase. We demonstrate the feasibility of the system via theoretical analysis, and the numerical simulation results show that the scheme can demodulate the signal well and improve the signal-to-noise ratio by 30 dB, even in the case of the signal of the direct demodulation method is drowned out by noise and completely distorted.

关键词： Quantum sensing optical techniques

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