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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Cao, Xianyi Wang, Long Li, Tianyi Cai, Minglu Wu, Guiling Chen, Jianping Wu, Kan State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

We propose a coherent stitching method by exploring the coherence in different beat notes in a dual-comb Lidar. An equivalent sweeping bandwidth of 70 GHz and a voxel rate of 100 kHz are achieved. © Optica Publis... 详细信息

ISBN: (纸本)9781957171395

关键词： optical radar

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Atomic transport dynamics in crossed optical dipole trap

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Chinese Physics B 2024年第7期33卷 293-301页

作者：彭鹏张正熙樊耀塬殷国玲毛德凯陈徐宗熊炜周小计 State Key Laboratory of Advanced Optical Communication System and Network School of ElectronicsPeking UniversityBeijing 100871China Institute of Carbon-based Thin Film Electronics Peking UniversityTaiyuan 030012China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China

We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loading and atomic *** loading process normally is negligible in the evaporative cooling experiment on the ground, while it is significant in preparation of ultra-cold atoms in the space station. Normally, the atomic loading process is much weaker than the atomic loss process, and the atomic number in the central region of the trap decreases monotonically, as reported in previous research. However, when the atomic loading process is comparable to the atomic loss process, the atomic number in the central region of the trap will initially increase to a maximum value and then slowly decrease, and we have observed the phenomenon first. The increase of atomic number in the central region of the trap shows the presence of the loading process, and this will be significant especially under microgravity conditions. We build a theoretical model to analyze the competitive relationship, which coincides with the experimental results well. Furthermore, we have also given the predicted evolutionary behaviors under different conditions. This research provides a solid foundation for further understanding of the atomic transport process in traps. The analysis of loading process is of significant importance for preparation of ultra-cold atoms in a crossed optical dipole trap under microgravity conditions.

关键词： cold atom crossed optical dipole trap transport process

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Intelligent indoor metasurface robotics

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National Science Review 2023年第8期10卷 20-32页

作者： Hanting Zhao Shengguo Hu Hongrui Zhang Zhuo Wang Hao Dong Philipp del Hougne Tie Jun Cui Lianlin Li State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Center on Frontiers of Computing Studies School of Computer Science Peking University The French National Centre for Scientific Research(CNRS) University of Rennes State Key Laboratory of Millimeter Waves Southeast University

Intelligent indoor robotics is expected to rapidly gain importance in crucial areas of our modern society such as at-home health care and factories. Yet, existing mobile robots are limited in their ability to perceive and respond to dynamically evolving complex indoor environments because of their inherently limited sensing and computing resources that are, moreover, traded off against their cruise time and payload. To address these formidable challenges, here we propose intelligent indoor metasurface robotics(I2MR),where all sensing and computing are relegated to a centralized robotic brain endowed with microwave perception; and I2MR's limbs(motorized vehicles, airborne drones, etc.) merely execute the wirelessly received instructions from the brain. The key aspect of our concept is the centralized use of a computation-enabled programmable metasurface that can flexibly mold microwave propagation in the indoor wireless environment, including a sensing and localization modality based on configurational diversity and a communication modality to establish a preferential high-capacity wireless link between the I2MR's brain and limbs. The metasurface-enhanced microwave perception is capable of realizing low-latency and high-resolution three-dimensional imaging of humans, even around corners and behind thick concrete walls, which is the basis for action decisions of the I2MR's brain. I2MR is thus endowed with real-time and full-context awareness of its operating indoor environment. We implement, experimentally, a proof-of-principle demonstration at ～2.4 GHz, in which I2MR provides health-care assistance to a human inhabitant. The presented strategy opens a new avenue for the conception of smart and wirelessly networked indoor robotics.

关键词： intelligent metasurfaces intelligent robotics edge devices IoT 6G

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Breaking the Limitation Between Ranging/Velocity Resolution and Voxel Rate by Coherent Stitching in a Dual-comb Lidar

Breaking the Limitation Between Ranging/Velocity Resolution ...

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CLEO: Applications and Technology in CLEO 2024, CLEO: A and T 2024 - Part of Conference on Lasers and Electro-Optics

关键词： optical fibers

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optical Fiber Time Transfer Monitoring and Management system 8th

Optical Fiber Time Transfer Monitoring and Management System

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8th International Conference on Computing, Control and Industrial Engineering, CCIE 2024

作者： Li, Tianyuan Xie, Kunfeng Yang, Yansong Hu, Liang Chen, Jianping Wu, Guiling State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9789819769360

In the paper, we design a monitoring and management system (MMS) for optical fiber time transfer (OFTT) based on manager/agent model. The proposed system includes monitoring and management server (MM-Server), monitoring and management unit (MMU) on OFTT device, and the communication interfaces interconnecting these entities. Utilizing B/S architecture and the Model-View-Controller design pattern, the MM-Server effectively segregates data, service logic, and the user interface, thereby improving the system’s scalability. The scalable and persistent OFTT-MMS has been tested on a bidirectional time-division multiplexing same-fiber same-wavelength OFTT system. The results indicate that the OFTT-MMS are capable to acquire real-time operational status of the time transfer devices and links, identify and handle faults, as well as realize remote configuration and visual monitoring of system performance, which can effectively improve the reliability, security, and availability of the OFTT system. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： optical fibers

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Neural Channel Model-Aided Distributed Dispersion Manage Optimization for Mitigation of Nonlinearities and Dispersion in Fibre Transmission

Neural Channel Model-Aided Distributed Dispersion Manage Opt...

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2024 Asia communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and optical communications, IPOC 2024

作者： Zeng, Chuyan Niu, Zekun Yang, Hang Shi, Minghui Hu, Weisheng Yi, Lilin State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

A distributed dispersion manage system is proposed for mitigating fibre nonlinearities and dispersion in fibre transmission through optimizing accumulated chromatic dispersion (aCD) distribution. 0.7 dB OSNR improveme... 详细信息

ISBN: (纸本)9798350379266

关键词： Chromatic dispersion

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A Compact Low-crosstalk Silicon Waveguide Array Based on Floquet Theory

A Compact Low-crosstalk Silicon Waveguide Array Based on Flo...

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2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Chen, Yu Yi, Xiaogen Zhan, Hengjie Qiu, Ciyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

We developed a new scheme to suppress the crosstalk between waveguides in a compact half-wavelength pitch silicon waveguide array. In the experimental demonstrations, low crosstalk (CT) of −23 dB is obtained at 1550 n... 详细信息

关键词： optical waveguides

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Design and analysis of an integrated optical coupler based on three-core fiber with long-period gratings

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optical and Quantum Electronics 2024年第10期56卷 1-14页

作者： Jiang, Yan Zhao, Yunhe Wang, Xin Ma, Lin Chen, Siyu Liu, Yunqi He, Zuyuan Institute of Logistics Science and Engineering Shanghai Maritime University Shanghai201306 China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai200444 China

Oriented to the multicore fiber-based space-division multiplexing (SDM) networks, the inter-core coupling in multicore fiber is desired to transfer signals between cores. In this paper, we proposed and designed an integrated optical coupler based on three-core fiber (TCF) with long-period gratings (LPGs). The TCF with three cores distributed in the cladding connected with single-mode fiber at both ends through adjacent cores. The self-coupling characteristics of TCF are studied firstly, and the effects of core pitch and coupling distance on coupling efficiency are analyzed to rule out the direct coupling between adjacent cores, indicating that coupling distance increases with the core pitch increases. With LPGs induced in TCF, coupling between core mode and cladding mode in each individual core is realized, and then the power at resonance wavelength transfers among cores through the overlapped cladding modes. Moreover, with the LPGs, the efficient coupling among adjacent cores in TCF has been realized at the C-band. In addition, the influence of structural parameters such as core pitch, grating duty cycle and coupling co-efficiency do affect the coupling efficiency of TCF-LPGs. By adjusting the structural parameters properly, coupling efficiency of ~ 66% could be achieved to equalizing the output power in three cores. Therefore, the proposed TCF-LPGs could be used as an optical coupler, which would be helpful in multicore fiber-based SDM networks. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

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One-bit quantization is good for programmable coding metasurfaces

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Science China(Information Sciences) 2022年第7期65卷 225-239页

作者： Ya SHUANG Hanting ZHAO Menglin WEI Qiang CHENG Shi JIN Tiejun CUI Philipp DEL HOUGNE Lianlin LI State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking University Institute of Electromagnetic Space Southeast University State Key Laboratory of Millimeter Waves Southeast University Pazhou Laboratory University of Rennes

The information-carrying programmable metasurfaces have found widespread applications in communication, sensing, and other related areas. However, there is a fundamental but unresolved problem,i.e., the rigorous understanding of the quantization of metasurface coding. Here, we theoretically investigate the performance difference between one-bit and continuous information-encoding metasurfaces. To this end,we derive analytical representations of system responses in various cases(single-input single-output, singleinput multiple-output, and multiple-input multiple-output). We analyze the impact of one-bit coding(in contrast to continuous coding) in terms of the resulting channel cross-talk and reduction of information capacity in various representative scenarios from wireless communication and holography. Our main finding indicates that the one-bit coding yields a satisfactory performance in most practical scenarios; we also show that in many cases there are smart ways to mildly relax optimization constraints in order to reduce the performance gap between the one-bit and continuous coding. We expect that our results can provide theoretical guidance for a large variety of metasurface-assisted information systems for electromagnetic waves and other wave phenomena.

关键词： metasurfaces metamaterials information capacity signal representation one-bit coding meta-surface

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Integrated optical frequency transfer and optical physical layer key distribution with enhanced link reciprocity detection

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Science China(Information Sciences) 2024年第7期67卷 335-336页

作者： Kunfeng XIE Liang HU Jianping CHEN Guiling WU State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic EngineeringShanghai Jiao Tong University

optical fiber transmission has been widely used in communications and metrology, wherein optical frequency transfer (OFT) and optical physical layer secure key distribution (OKD) have become research hotspots [1, 2]. Moreover,OFT can perform a comparison between state-of-the-art optical atomic clocks and implement coherent optical phase transfer over long distances to support geodesy [1, 3].

关键词： distribution integrated physical detection layer link with enhanced frequency optical

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