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22nd International Conference on optical communications and networks, ICOCN 2024

作者： Wu, Guiping Lin, Xiao Lin, Huihuang Hong, Zhixiang Zhang, Jia Chen, Zhen Li, Jun Sun, Weiqiang Lou, Zhilan College of Physics and Information Engineering Fuzhou University Fuzhou China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai China School of Electronic and Information Engineering Soochow University Suzhou China School of Data Sciences Zhejiang University of Finance and Economics Hangzhou China

In this paper, an STC-SnF approach is presented to schedule bulk data transfers across the CPON. Studies show it can ensure the coordinated space-time relation of bandwidth fragments and hence benefit the SnF scheduli... 详细信息

ISBN: (纸本)9798350367652

关键词： Computing power

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Silicon Photonic Tunable Flat-top Filters based on CROW Structures at 2-μm Spectral Range

Silicon Photonic Tunable Flat-top Filters based on CROW Stru...

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2023 optical Fiber communications Conference and Exhibition, OFC 2023

作者： Wu, You Guo, Xiaoyuan Wang, Xi Du, Jiangbing Song, Qinghai Xu, Ke Harbin Institute of Technology Department of Electronic and Information Engineering Shenzhen518055 China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai200240 China Harbin Institute of Technology Department of Science Shenzhen518055 China

Silicon photonic tunable flat-top filters are demonstrated via the 5th-order and the 10th-order CROW structure at 2-μm waveband. Box-like transmission spectra are measured with 3-dB bandwidth of 3.34 nm and 5.34 nm, ... 详细信息

ISBN: (纸本)9781957171180

关键词： Silicon photonics

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Integrated W-band Photonic-Wireless Transmitter Enabled by Silicon Microring Modulator and On-chip Dual-mode DFB Laser

Integrated W-band Photonic-Wireless Transmitter Enabled by S...

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2023 optical Fiber communications Conference and Exhibition, OFC 2023

作者： Liu, Xuying Zhang, Wenjia Jiang, Yue Lu, Dan Yang, Fan He, Zuyuan Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai200240 China Institute of Semiconductors Chinese Academy of Sciences Key Laboratory of Semiconductor Material Science Beijing100083 China University of Electronic Science and Technology of China School of Electronic Science and Engineering Chengdu610054 China

We propose an integrated W-band transmitter enabled by dual-mode DFB laser and silicon microring modulator for next generation wireless communication. Error free transmission of 10 Gb/s communication at 85 GHz have be... 详细信息

ISBN: (纸本)9781957171180

关键词： Distributed feedback lasers

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Tunable Silicon Ring Resonator with Wavelength-scale Radius at 2-μm Waveband

Tunable Silicon Ring Resonator with Wavelength-scale Radius ...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Wu, You Wang, Xi Zhang, Zimeng Du, Jiangbing Song, Qinghai Xu, Ke Department of Electronic and Information Engineering Harbin Institute of Technology Shenzhen518055 China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China Department of Science Harbin Institute of Technology Shenzhen518055 China

A tunable silicon photonic microring resonator with radius of 2 μm is demonstrated at 2-μm waveband. Ultra-large free spectral range of 75.312 nm and extinction ratio of 23.93 dB are achieved. © Optica Publishi... 详细信息

ISBN: (纸本)9781957171258

关键词： Silicon photonics

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The Miniaturized Integrating Sphere Cold Atom Clock based on Fiber Mirrors

The Miniaturized Integrating Sphere Cold Atom Clock based on...

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2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2023

作者： Wang, Xiumei Wang, Danyang Wang, Yifei Wang, Wenming Deng, Bohan Li, Shiguang Wang, Yunjia Wang, Weili Wang, Liang He, Jin Chen, Jingbiao Beijing Institute of Radio Measurement and Metrology Time and Frequency Center Beijing100857 China PKU-HKUST Shen Zhen-HongKong Institution Shen Zhen SoC Key Laboratory Shen Zhen518057 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing100871 China

ISBN: (纸本)9798350311426

Diffuse laser cooling provides a compact cold atom system for quantum precision measurement processes, especially for the integrating sphere cold atom clock. However, the laser cooling system of current integrating sphere cold atom clock is bulky and complex, which is not conductive to the miniaturization of cold atom clock. In order to make a less complex diffuse laser cooling system, we adopt the scheme to combine the fiber mirrors and the diffuse laser cooling technique. The incident laser beams are reflected by the fiber mirrors and teflon, and the atoms can be successfully cooled and detected in the miniaturized zone. The preparation of fiber mirrors and the realization of diffuse laser cooling system with a simple optical system can lay a solid foundation for further miniaturization of the overall system of integrating sphere cold atom clock in the future. © 2023 IEEE.

关键词： diffuse laser cooling fiber mirrors ISCAC miniaturization

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Capacity increase in dual-polarization nonlinear frequency division multiplexing systems with probabilistic shaping 26

Capacity increase in dual-polarization nonlinear frequency d...

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26th Optoelectronics and communications Conference, OECC 2021

作者： Li, Chenjia Chen, Xinyu Chen, Zhangyuan Zhang, Fan State Key Laboratory of Advanced Optical Communication System Networks Frontiers Science Center for Nano-Optoelectronics Department of Electronics Peking University Beijing100871 China

We demonstrate 200Gb/s dual-polarization continuous spectrum NFDM systems combined with the probability shaping transmission over SSMF by numerical simulation. For 16QAM and 64QAM systems, the transmission distance ca... 详细信息

ISBN: (纸本)9781557528209

关键词： Multiplexing equipment

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Q-BIC Enhanced Free Electron Radiation Based on a Double-Period Grating Structure

Q-BIC Enhanced Free Electron Radiation Based on a Double-Per...

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Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSRWTC)

作者： Ji- Tao Yang Yu-Lu Lei Chao-Hai Du Center for Carbon-based Electronics School of Electronics Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University

ISBN: (数字)9798331507794

ISBN: (纸本)9798331507800

Smith-Purcell radiation (SPR), which occurs when electrons traverse a diffraction grating, is a promising candidate for tunable terahertz sources. Recent advancements in enhancing free-electron radiation have highlighted bound states in the continuum (BICs) as a significant approach to augmenting SPR intensity. In this study, we systematically explore the resonance enhancement of SPR using a two-period planar metal grating. We demonstrate that deep modulation of this grating can convert conventional Smith-Purcell radiation into quasi-BIC-enhanced Smith-Purcell radiation, achieving an intensity increase of 60 times compared to standard radiation. Our findings offer a mechanism for enhancing SPR from metal gratings and suggest potential applications in free-electron terahertz sources.

关键词： Wireless communication Metals Modulation Terahertz radiation Resonance system-on-chip Gratings Standards Electrons Terahertz communications

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A LiDAR-Aided Channel Model for Vehicular Intelligent Sensing-communication Integration

arXiv

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arXiv 2024年

作者： Huang, Ziwei Bai, Lu Sun, Mingran Cheng, Xiang The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China Shandong University Jinan250101 China

In this paper, a novel channel modeling approach, named light detection and ranging (LiDAR)-aided geometry-based stochastic modeling (LA-GBSM), is developed. Based on the developed LA-GBSM approach, a new millimeter wave (mmWave) channel model for sixth-generation (6G) vehicular intelligent sensing-communication integration is proposed, which can support the design of intelligent transportation systems (ITSs). The proposed LA-GBSM is accurately parameterized under high, medium, and low vehicular traffic density (VTD) conditions via a sensing-communication simulation dataset with LiDAR point clouds and scatterer information for the first time. Specifically, by detecting dynamic vehicles and static building/tress through LiDAR point clouds via machine learning, scatterers are divided into static and dynamic scatterers. Furthermore, statistical distributions of parameters, e.g., distance, angle, number, and power, related to static and dynamic scatterers are quantified under high, medium, and low VTD conditions. To mimic channel non-stationarity and consistency, based on the quantified statistical distributions, a new visibility region (VR)-based algorithm in consideration of newly generated static/dynamic scatterers is developed. key channel statistics are derived and simulated. By comparing simulation results and ray-tracing (RT)-based results, the utility of the proposed LA-GBSM is verified. Copyright © 2024, The Authors. All rights reserved.

关键词： Millimeter waves

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A Compact Rubidium optical Clock Based on Modulation Transfer Spectrum

A Compact Rubidium Optical Clock Based on Modulation Transfe...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Zhendong Chen Ruoao Yang Yang Qiaohui Tianyu Liu Ya Wang Jie Miao Duo Pan Jianjun Wu Zhigang Zhang Jingbiao Chen State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum Electronics School of Electronics Peking University Beijing China Hefei National Laboratory Heifei China

ISBN: (数字)9798350371901

ISBN: (纸本)9798350371918

A compact rubidium optical clock is presented, incorporating an optical frequency standard, a fiber frequency comb, and associated control electronics. Modulation transfer spectroscopy, devoid of Doppler background and characterized by a high signal-to-noise ratio and sensitivity, is employed to lock the laser frequency to the hyperfine transitions of rubidium atomic lines. The clock exhibits a short-term stability of 4.10 × 10 -13 at a 1-second gate time, and the stability remains below 7.27 × 10 -13 up to 1000 seconds. These results offer a promising alternative approach for the development of portable optical clocks.

关键词： optical fibers optical fiber sensors Frequency modulation Atom optics Laser stability optical variables control optical modulation Rubidium Frequency control Clocks

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Channel Estimation for Holographic communications in Hybrid Near-Far Field

arXiv

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arXiv 2024年

作者： Yue, Shaohua Zeng, Shuhao Liu, Liang Di, Boya State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China The Hong Kong Polytechnic University Hong Kong

To realize holographic communications, a potential technology for spectrum efficiency improvement in the future sixth-generation (6G) network, antenna arrays inlaid with numerous antenna elements will be deployed. However, the increase in antenna aperture size makes some users lie in the Fresnel region, leading to the hybrid near-field and far-field communication mode, where the conventional far-field channel estimation methods no longer work well. To tackle the above challenge, this paper considers channel estimation in a hybrid-field multipath environment, where each user and each scatterer can be in either the far-field or the near-field region. First, a joint angular-polar domain channel transform is designed to capture the hybrid-field channel’s near-field and far-field features. We then analyze the power diffusion effect in the hybrid-field channel, which indicates that the power corresponding to one near-field (far-field) path component of the multipath channel may spread to far-field (near-field) paths and causes estimation error. We design a novel power-diffusion-based orthogonal matching pursuit channel estimation algorithm (PD-OMP). It can eliminate the prior knowledge requirement of path numbers in the far field and near field, which is a must in other OMP-based channel estimation algorithms. Simulation results show that PD-OMP outperforms current hybrid-field channel estimation methods. Copyright © 2024, The Authors. All rights reserved.

关键词： Antenna arrays

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