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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Weiying Yang Xiaoyu Liu Zhiyang Liu Shilin Xiao The State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

Thanks to the flexibility and adaptability of polar codes, a Free-space optical (FSO) communication scheme combining it with probabilistic shaping (PS) and pulse amplitude modulation (PAM) is proposed to achieve capacity improvement in atmospheric turbulence (AT) channels. The proposed scheme generates a non-uniform probability distribution PAM-8 transmission symbol by a multilevel polar-coded modulation (MLPC) method equipped with the most significant bit (MSB) level shaping precoder. Under the selected turbulence conditions, it provides up to 1.09dB theoretical shaping gain of capacity at the specified information rate (AIR) of 1.859 bit/channel use and 0.82dB performance gain in block error rate.

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Receiver Sensitivity Improvement with Joint Geometric and Probabilistic Shaping for 200G Flexible Coherent Passive optical Network

Receiver Sensitivity Improvement with Joint Geometric and Pr...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Gengming Lin Yixiao Zhu Zijun Yan Yimin Hu Xi Chen Qunbi Zhuge Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

We optimize and experimentally demonstrate joint GPS scheme under level-dependent PD noise for 200G flexible coherent PON. GPS-16-QAM scheme achieves >1-dB and 0.6-dB receiver sensitivity improvement compared with ...

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Flexible and High-Fidelity Concurrent Dual-Band Delta-Sigma Modulator for Diverse Applications Convergence

Flexible and High-Fidelity Concurrent Dual-Band Delta-Sigma ...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Zijun Yan Yixiao Zhu Yikun Zhang Yimin Hu Gengming Lin Qi Wu Ziyu Cheng Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

We propose and experimentally demonstrate a concurrent dual-band delta-sigma modulation for fronthaul. The proposed modulator can flexibly adjust the center frequency of each passband with ~3.0-dB SNR improvement, sup...

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Experimental demonstration of a quantum downstream access network in continuous variable quantum key distribution with a local local oscillator

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Photonics Research 2024年第6期12卷 1262-1273页

作者： DENGKE QI XIANGYU WANG ZHENGHUA LI JIAYU MA ZIYANG CHEN YUEMING LU SONG YU State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Trustworthy Distributed Computing and Service(MoE) Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronicsand Center for Quantum Information TechnologyPeking UniversityBeijing 100871China

Quantum networks provide opportunities and challenges across a range of intellectual and technical frontiers,including quantum computation,communication,and *** traditional communication networks,quantum networks utilize quantum bits rather than classical bits to store and transmit *** key distribution(QKD)relying on the principles of quantum mechanics is a key component in quantum networks and enables two parties to produce a shared random secret key,thereby ensuring the security of data *** this work,we propose a cost-effective quantum downstream access network structure in which each user can get their corresponding key information through terminal *** on this structure,we demonstrate the first four-end-users quantum downstream access network in continuous variable QKD with a local local *** contrast to point-to-point continuous variable QKD,the network architecture reevaluates the security of each user and accounts for it accordingly,and each user has a lower tolerance for excess noise as the overall network expands with more ***,the feasibility of the experiment is based on the analysis of the theoretical model,noise analysis,and multiple techniques such as the particle filter and adaptive equalization algorithm used to suppress excess *** results show that each user can get a low level of excess noise and can achieve secret key rates of 546 kbps,535 kbps,522.5 kbps,and 512.5 kbps under a transmission distance of 10 km,respectively,with the finite-size block of 1×10~*** not only verifies the good performance but also provides the foundation for the future multi-user quantum downstream access networks.

关键词： quantum oscillator local

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Self-Correcting Beam Training Scheme for Metasurface Enabled XL-MIMO with Hardware Limitations

Self-Correcting Beam Training Scheme for Metasurface Enabled...

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IEEE Conference on Wireless communications and Networking

作者： Zhihan Chen Shupei Zhang Shaohua Yue Boya Di State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China

ISBN: (数字)9798350368369

ISBN: (纸本)9798350368376

Reconfigurable intelligent surfaces (RISs) are considered as an efficient solution for the implementation of extremely large-scale MIMO (XL-MIMO). To mitigate the complexity of channel information acquisition, beam training is identified as an effective solution by selecting the optimal beam from a predefined codebook. However, practical hardware limitations of RIS result in the overlap of codeword coverage, i.e., non-orthogonal beams, which degrades the accuracy of optimal beam selection. In this paper, we propose a self-correcting hierarchical beam training scheme, where beam training is designed as a sequential process based on a tailored long short-term memory network. Received powers of sequentially selected multi-layer codewords are integrated to construct quasi-orthogonality for optimizing the beam selection. Beam training is thus reformulated as a sequential codeword classification problem. A codeword priority adjustment procedure is then designed to prevent the beam selection from looping among layers according to the visit frequency to each codeword of the current selection path. Simulation results show that our proposed method outperforms existing beam training approaches in terms of beam selection accuracy and sum rate in the presence of hardware limitations.

关键词： Training Deep learning Accuracy communication systems Simulation Reconfigurable intelligent surfaces Metasurfaces Hardware Complexity theory Long short term memory

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Self-Correcting Beam Training Scheme for Metasurface Enabled XL-MIMO with Hardware Limitations

Self-Correcting Beam Training Scheme for Metasurface Enabled...

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2025 IEEE Wireless communications and Networking Conference, WCNC 2025

作者： Chen, Zhihan Zhang, Shupei Yue, Shaohua Di, Boya School of Electronics Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing China

ISBN: (纸本)9798350368369

关键词： Deep learning

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Full-Band optical Signal Amplification Using Bismuth-Doped Multicomponent Fibers: Models and Performance 15

Full-Band Optical Signal Amplification Using Bismuth-Doped M...

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15th International Conference on Information Optics and Photonics, CIOP 2024

作者： Zhao, Xiaoan Jiang, Chun Valley Christian High School 100 Skyway Dr #130 San JoseCA95111 United States State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

ISBN: (数字)9781510686175

ISBN: (纸本)9781510686168

Current wavelength division multiplexing (WDM) transmission systems based on silica fibers rely on the single-channel transmission rate and the number of wavelength channels for communication capacity. While single-channel rates have reached Tb/s levels, further enhancement is severely limited by electronic bottlenecks. To boost system capacity, an effective approach is to increase the number of wavelength channels. The low-loss window of silica fibers, spanning 1250-1800 nm with a loss below 0.4 dB, represents a substantial untapped resource. To fully utilize the full-band bandwidth of silica fibers, it is imperative to develop a full-band fiber amplifier covering this wavelength range. This paper proposes bismuth-doped multicomponent fiber concatenation and parallel connection schemes, establishes energy level structures, rate equations, and power propagation equations for pump, signal, and amplified spontaneous emission light in bismuth-doped silica and germano-silica matrices, calculates the full-band gain spectrum, and optimizes its flatness using a genetic algorithm. Results show that the gain magnitude and flatness of the two amplifier structures depend on pump wavelength, pump power, fiber length, and doping concentration, with the parallel structure offering greater flexibility in controlling the full-band gain spectrum. © 2024 SPIE.

关键词： Glass fibers

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Microwave Signal Generation by Heterodyning Dual Lasers Injection-locked to a Single Microring Resonator

Microwave Signal Generation by Heterodyning Dual Lasers Inje...

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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： Siyu, E. Guo, Yuyao Li, Xinhang Fan, Yihao Jin, Minhui Li, Yu Lu, Liangjun Chen, Jianping Zhou, Linjie State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Lab of Navigation and Location Services Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu314200 China

We demonstrate the co-injection locking of two lasers to a high-Q MRR, achieving a linewidth of ~10 Hz. Through heterodyne synthesis, the resulting microwave signal exhibits a drift of only 898 kHz over 10 hours. ... 详细信息

ISBN: (纸本)9798350379266

关键词： Heterodyning

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Active optical clock: Seventeen years of progress and next steps 9

Active optical clock: Seventeen years of progress and next s...

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9th Symposium on Frequency Standards and Metrology, FSM 2023

作者： Zhang, Jia Shi, Tiantian Miao, Jianxiang Guan, Xiaolei Gao, Xun Chen, Jingbiao State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum Electronics School of Electronics Peking University Beijing100871 China School of Integrated Circuits Peking University Beijing100871 China National Key Laboratory of Advanced Micro and Nano Manufacture Technology Beijing100871 China Hefei National Laboratory Hefei230088 China

The concept of the active optical clock (AOC) was proposed seventeen years ago by prof. Jingbiao Chen. After early calculations and experiments that demonstrated the advantages of "cavity-pulling suppression"and "narrower linewidth", the development of AOCs soon became an active competition involving many research groups that proposed schemes based on different atomic species, and different energy-level structures. In this paper, after a brief background introduction, we will mainly focus on the most recent experimental and theoretical progress of AOCs in Peking University. In addition, we give an outlook on AOCs based on cold atoms that can be operated continuously, and report a novel AOC scheme based on diffuse laser cooling that can be operated continuously for the first time, which is proposed and performed by Peking University. The AOC has great promise for applications in quantum metrology, as it can overcome the thermal noise of the reference cavity that limits conventional lasers, making AOC a promising candidate for future atomic optical clocks. © Published under licence by IOP Publishing Ltd.

关键词： Atoms

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Fiber Mapping Using Neural networks for Physical-Layer Secure key Distribution

Fiber Mapping Using Neural Networks for Physical-Layer Secur...

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International Conference on optical communications and networks (ICOCN)

作者： Yuhao Zhong Xinran Huang Zhi Chai Mingye Li Xuelin Yang State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University China

Neural networks are applied for fiber mapping in unidirectional physical-layer key distribution, where the bi-directional long short-term memory increases the key generation rate from 12.28 to 13.68 Gbps.

ISBN: (数字)9798350367652

ISBN: (纸本)9798350367669

关键词： Training Bidirectional control optical fiber networks Long short term memory

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