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27th International Conference on optical Fiber Sensors, OFS 2022

作者： Deng, Yuanpeng Liu, Qinwen Li, He Dai, Zhiwei He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

We demonstrate a quasi-distributed temperature sensor with optical frequency domain reflectometry (OFDR) and weak reflector array. A temperatrure resolution of 0.3 C is achieved with large measurement range. © 20... 详细信息

ISBN: (纸本)9781957171142

关键词： Frequency domain analysis

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A 300-km fully-connected quantum secure direct communication network

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Science Bulletin 2025年第9期70卷 1445-1451页

作者： Yang, Yilin Li, Yuanhua Li, Hao Wu, Chennan Zheng, Yuanlin Chen, Xianfeng State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Department of Physics Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric Power Shanghai200090 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal University Jinan250358 China

Transmission distance and number of users limit the realization of large-scale scalable quantum communication networks, as existing quantum network construction techniques struggle to address these two important factors simultaneously. In this paper, we propose a long-distance large-scale and scalable fully-connected quantum secure direct communication (QSDC) network, which employs a double-pumped structure and the introduction of extra noise to successfully realize QSDC over 300 km between four users in the network in pairs. The results demonstrate that the fidelity of the entangled state shared between users following communication remains above 85%. The results of our research demonstrate the viability of this quantum communication network, offering a novel foundation for the future realization of long-distance large-scale quantum communication. © 2025 Science China Press

关键词： Quantum communication

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3D Microwave Imaging as Point Cloud with Continous Normalizing Flows

3D Microwave Imaging as Point Cloud with Continous Normalizi...

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2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Bi, Xueting Li, Lianlin Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing100871 China

ISBN: (纸本)9781665452366

Point cloud is a 3D representation with accurate location information, which can be applied to multi visual and graphic tasks. If the microwave can be imaged as a point cloud, the accurate position information of the target in the 3D solid space can be obtained, which is of great significance and great challenge. In this paper, a model of learning two-level distribution is designed for microwave imaging with point cloud as the target, that is, different kinds of targets are modeled into shape distribution, different individuals in the same kind are modeled into point distribution, and reversible continuous normalizing flow is used in each level. The visualization of experimental results shows that this method can produce impressive results. © 2022 IEEE.

关键词： Imaging systems

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Dispersion Analysis of Ultrathin Grating for Free-Electron-Driven Frequency Comb

Dispersion Analysis of Ultrathin Grating for Free-Electron-D...

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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Lei, Yu-Lu Zhang, Zi-Wen Du, Chao-Hai Center for Carbon-based Electronics School of Electronics Peking University China School of Electronics Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks China

ISBN: (纸本)9781733509657

The utility of free-electron radiation spans numerous fields, including biological imaging, particle detection, and light generation across a wide frequency range, from microwave to X-ray. Despite extensive efforts to manipulate properties such as directionality, phase, and polarization using metamaterials, the intrinsic broadband spectra of free-electron radiation have yet to be fully exploited for the generation of frequency combs, which represent state-of-the-art technology in metrology and spectroscopy. In this study, we demonstrate the analysis of the dispersion of ultrathin grating for the generation of a free-electron-driven frequency comb. By assuming the decay rate of arbitrary mode is the same in all directions of the designed structure, a rational and adaptable platform for generating a specific frequency comb is presented, which has the potential to advance the development of metrology and spectroscopy in the terahertz band. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Decay (organic)

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Platform for designing bipartite entangled quantum frequency combs based on silicon nitride microring resonators

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Physical Review Applied 2024年第5期21卷 054058-054058页

作者： Nianqin Li Bo Ji Yang Shen Guangqiang He State Key Laboratory Of Advanced Optical Communication Systems And Networks Department Of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

Integrated Kerr quantum frequency combs (QFCs), with the potential to generate multiple and scalable quantum states, have emerged as a compact, stable, and fundamental resource for broadband entanglement. Here, we build a platform for designing bipartite entangled QFCs via an on-chip silicon nitride microring resonator. By establishing the system quantum dynamics of Kerr nonlinear microresonators, our platform can support up to 12 continuous-variable quantum modes, in the form of six simultaneously two-mode squeezed pairs under the influence of hysteresis. The entanglement degree of frequency-mode pairs is dependent on the resonator structure and ambient temperature. By adjusting the cavity temperature, we can optimize the performance of entanglement under certain injected pump power and pump detuning. Our comprehensive QFC designing process and entanglement distribution control may ameliorate the generation and optimization of entanglement.

关键词： Frequency combs & self-phase locking Photonics Quantum communication, protocols & technology Nitrides optical microcavities Semiconductor compounds Cavity resonators Kerr effect

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Scalable low-modal-crosstalk mode-group demultiplexer for MDM transmission over MMF

Scalable low-modal-crosstalk mode-group demultiplexer for MD...

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2023 International Academic Conference on Optics and Photonics, IACOP 2023

作者： Cui, Jian Deng, Yu Liu, Zhuo Hao, Bin Tan, Daiwei Wu, Chao Zhang, Leimin Li, Juhao He, Yongqi Wan, Qi Department of Networks China Mobile Communications Group Co. Ltd. Beijing100033 China State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China

ISBN: (纸本)9781510672543

Weakly-coupled mode-division multiplexing (MDM) transmission technique over widely-deployed multimode fiber (MMF) is considered a promising approach to enhance the capacity of optical fiber communication systems. In order to be compatible with cost-efficient intensity-modulation/direct-detection (IM/DD) systems, effective mode-group demultiplexing approaches to simultaneously receive each mode group of MMF are highly desired. In this paper, we propose a scalable low-modal-crosstalk mode-group demultiplexer over MMF using multi-plane light conversion (MPLC), in which input Hermite-Gaussian (HG) modes of MMF are first converted to bridging modes that composed of HG00 modes distributed as a right-angled triangle in Cartesian coordinates, and then each HG00 mode belonging to the same mode group are respectively converted to different HGn0 modes at the same output for simultaneous detection. With the help of bridging modes, the MPLC-based mode-group demultiplexer can scale to demultiplex more mode groups with relatively few phase masks. A 5 mode-group demultiplexer is also design for demonstration, and simulation results show that the modal-crosstalk are lower than -22.26 dB for all mode groups. © 2023 SPIE.

关键词： Multimode fibers

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Calibration of Fiber-Optic Time Synchronization system over 800km

Calibration of Fiber-Optic Time Synchronization System over ...

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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： Dong, Jiameng Wang, Zhaohui Zhang, Rui Yu, Song Luo, Bin Guo, Hong School of Electronic Engineering State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China School of Electronics Center for Quantum Information Technology Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing China

ISBN: (纸本)9798350311426

Due to the excellent performance in accuracy and stability, fiber-optic time synchronization is becoming a key technology in the field of time-frequency metrology. And the accuracy of fiber-optic time synchronization system mainly depends on asymmetry calibration. Here we study the calibration of time synchronization system over 800km laboratory fiber link. Asymmetry caused by chromatic dispersion, bidirectional EDFAs, sending and receiving devices are investigated. After calibration, the residual of clock difference between two sites is 56.80ps, and the timing jitter is 33.91ps. By further optimizing the whole system and the method of calibration, a system with accuracy better than 50ps over thousands of kilometers fiber link is expected to be obtained in the future. © 2023 IEEE.

关键词： accuracy asymmetry calibration fiber link time synchronization system

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Chiral spontaneous emission propagation based on a honeycomb photonic crystal slab

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Physical Review A 2024年第6期109卷 063504-063504页

作者： Zhiyuan Qian Xuefan Yin Xinyi Zhou Feifan Wang Ye Chen Chao Peng State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics & Frontiers Science Center for Nano-optoelectronics Shenzhen 518055 China

We propose the direction-tunable chiral photonic propagation of spontaneous emission based on magnetic helicity and finite-size effect in a topological honeycomb photonic crystal slab. The chiral edge state channels are excited by emitters with magnetic polarization due to the C6 symmetry, where their propagation directions are tuned by the emitter's position on the magnetic helicity pattern. Meanwhile, the finite size of the honeycomb photonic crystal brings chirality oscillation, which also decides the chirality of photonic propagation. This method of controlling chiral transport in two-dimensional designs can be extended to a three-dimensional silicon-based photonic crystal slab containing a silver split ring resonator as the emitter providing spontaneous emission, which is convenient to fabricate via existing nanotechnology. Moreover, we show the magnetic Purcell effect with chiral transport in the three-dimensional topological PC slab structure. Our research reduces the threshold of on-chip photonic transmission under topological protection, which is helpful for single-photon sources, photonic integrated chip manufacturing, and quantum information processing.

关键词： Cavity quantum electrodynamics Spontaneous emission Topological effects in photonic systems

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On-chip erbium-doped lithium niobate microcavity laser

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Science China(Physics,Mechanics & Astronomy) 2021年第3期64卷 2-6页

作者： YiAn Liu XiongShuo Yan JiangWei Wu Bing Zhu YuPing Chen XianFeng Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China

The commercialization of lithium niobate on insulator(LNOI) wafer has resulted in significant on-chip photonic integration application owing to its remarkable photonic,acousto-optic,electro-optic,and piezoelectric *** recent years,a variety of high-performance on-chip LNOI-based photonic devices have been *** this study,we developed a 1-mol% erbium-doped lithium niobate crystal and its LNOI on a silicon substrate and fabricated an erbium-doped LNOI microdisk with high quality factor(~1.05×105).C-band laser emission at ~1530 and ~1560 nm(linewidth 0.12 nm) from the high-Q erbium-doped LNOI microdisk was demonstrated with 974-and 1460-nm pumping,with the latter having better thermal *** microlaser would play an important role in the photonic integrated circuits of the lithium niobate platform.

关键词： erbium-doped lithium niobate on insulator on-chip laser microdisk

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Divided GHz burst mode amplification to mJ burst energy and kHz burst rate

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Chinese Optics Letters 2025年第1期23卷 72-75页

作者： Yunfeng Wu Bowei Yang Zhe Lin Ruoao Yang Xing Chen Yanrong Song Zhigang Zhang School of Physics and Optoelectronic Engineering Beijing University of TechnologyBeijing 100124China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

We demonstrated a divided pulse amplification of burst pulse *** intraburst rate is 1 GHz,and the burst rate ranges from 1.5 k Hz to 15 *** the pump power of 100 W,the burst pulse energy is adjustable from 2.2μJ to 2... 详细信息

关键词： burst-mode pulse divided pulse amplification high repetition rate fiber laser

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