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A Digital Twin Assisted Link Status Visualization Framework for Failure Monitoring in optical networks: the ROADM Case

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Journal of Lightwave Technology 2025年

作者： Cai, Meng Liu, Xiaomin Fu, Mengfan Zhang, Yihao 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

Reconfigurable optical add-drop multiplexers (ROADMs) based on wavelength selective switches (WSSs) serve as the cornerstone for dynamic signal routing in all-optical networks. With growing demands for higher capacity and flexibility, the deployment of large-scale, high-degree ROADM networks has significantly increased. However, this expansion increases the impact of failures in ROADMs, which may cause widespread service disruption across all fibers connected to a ROADM node. Therefore, it is crucial to monitor and visualize the status of all ROADMs in optical networks. Current approaches are limited by their reliance on scarce real-system failure data or the need for additional monitors. To address these challenges, in this paper, we propose a physics-based digital twin assisted link status visualization (DT-LSV) framework for monitoring ROADM status, specifically focusing on filter shift (FS) and filter tightening (FT) failures. Our approach is only based on the receiver digital signal processing (DSP) and configuration parameters, eliminating the need for additional monitors. In the absence of labeled failure data, DT-LSV utilizes normal data, and as labeled failure data accumulates, it gradually learns to further enhance performance. By integrating a parameter learning module into the theoretical model, we construct a physics-based digital twin (DT) model. Using this model and real data from receiver DSP, we formulate and solve an optimization problem for accurate ROADM status visualization. Our framework is validated through extensive experiments, achieving a 100% accuracy in localizing ≥ 5 GHz FS (with a 0.66 dB signal-to-noise ratio (SNR) penalty) and ≥ 8.5 GHz FT anomalies (with a 1.31 dB SNR penalty). The root mean square error (RMSE) of failure magnitude estimation is 0.60 GHz for FS and 0.41 GHz for FT. Additionally, the high efficiency of the framework is demonstrated, the importance of the parameter learning module is underscored, and the effectiveness

关键词： Fiber to the x

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Reconfigurable Fiber-Optic Time Transfer Network Architecture Based on SD-TTU

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IEEE Internet of Things Journal 2025年

作者： Xie, Kunfeng Yang, Yansong Wang, Long Hu, Liang Chen, Jianping Wu, Guiling Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai200240 China

Network architectural is indispensable for a wide-area and robust fiber-optic time transfer network, however, there is currently a deficiency in effective scheme. This paper proposed a reconfigurable fiber-optic time transfer network architecture based on Software-Defined time transfer units, enhancing the network's capability for flexible resource allocation, automatic protection and restoration. The architecture consists of three layers: (1) Time Transfer Layer for time signal transmission and clock difference cancellation;(2) Monitor & Control Layer for monitoring network states, fault detection, and dynamic reconfiguration of the Software-Defined time transfer units;(3) Service & Configuration Layer for customizable service construction and proactive network reconfiguration. A polymorphic Software-Defined time transfer unit is further designed, which can operate as a master station, intermediate station, and slave station using the same hardware. The proposed architecture and the designed Software-Defined time transfer unit are experimentally demonstrated over chained and ring networks, respectively. Network expansion, contraction, topology reconfiguration, failure and fault recovery are validated. The changes of measured mean clock differences are below 43 ps across different scenarios, verifying the robustness and flexibility of the proposed architecture. © 2014 IEEE.

关键词： Clocks

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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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Sensing-communication-Computation Integration for Federated Edge Learning with Controllable Model Dropout

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IEEE Internet of Things Journal 2025年

作者： Jiao, Xiang Zhu, Guangxu Jiang, Wei Chen, Li Luo, Wu Wen, Dingzhu State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China Shenzhen Research Institute of Big Data Shenzhen China The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China The CAS Key Laboratory of Wireless Optical Communication University of Science and Technology of China Hefei China Network Intelligence Center School of Information Science and Technology ShanghaiTech University Shanghai China

FEderated Edge Learning (FEEL) is an advanced paradigm in edge artificial intelligence, enabling privacy-preserving collaborative model training through periodic communication between edge devices and a central server. FEEL involves three key processes: sensing, computation, and communication for data acquisition, processing, and exchange, respectively. Due to limited system resources, optimizing each process individually may lead to suboptimal learning performance. This challenge has sparked research into Integrated Sensing-Computation-communication (ISCC) design for enhanced FEEL. While previous work has optimized general learning parameters such as batch size and computing frequency, there is a lack of customized designs considering the neural network architecture as an optimizable variable in ISCC for FEEL. To close this gap, we introduce a novel design where each device generates a sub-model through controllable weight dropout, adding flexibility by directly manipulating the learning process and reducing computation and communication overhead. To guide ISCC resource allocation in this new setting, we present a comprehensive convergence analysis, revealing the tight coupling of sensing, computation, and communication across devices and their impact on FEEL convergence. Building on these theoretical insights, we formulate an ISCC problem aiming to maximize the FEEL convergence rate through joint optimization of variables such as batch size, sensing power, dropout rate, and communication power. This non-convex problem is decomposed into two sub-problems via alternating optimization: one controls batch size using a sorting algorithm, while the other focuses on ISCC device parameters, transformable into a convex problem solved by successive convex approximation. Extensive experiments using human motion recognition datasets demonstrate the superiority of the proposed design over baseline schemes. © 2014 IEEE.

关键词： Federated learning

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Thermal engineering in ALD-grown ZGO thin films for high-performance photodetectors

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材料科学技术（英文版） 2025年第6期209卷 19-26页

作者： Si-Tong Ding Yu-Chang Chen Cai-Yu Shi Lei Shen Qiu-Jun Yu Lang-Xi Ou Ze-Yu Gu Na Chen Ting-Yun Wang David Wei Zhang Hong-Liang Lu State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics & SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Zhangjiang Fudan International Innovation Center Shanghai 201203China National Integrated Circuit Innovation Center Shanghai 201203China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai Institute Communication and Data ScienceShanghai UniversityShanghai 200444China State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics & SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Zhangjiang Fudan International Innovation Center Shanghai 201203China National Integrated Circuit Innovation Center Shanghai 201203China Jiashan Fudan Institute Jiaxing 314100China

Doped gallium oxide-based thin films are a class of wide-band semiconductor materials with the ad-vantages of chemically stable,tunable bandgap,and offer the benefit of ultraviolet *** order to obtain photodetectors(PDs)with superior response,higher demands are placed on the quality of growth and processing of doped *** this work,Zn-doped ternary metal oxide ZnGaO(ZGO)thin films were grown using the atomic layer deposition technique and annealed at different temperatures under an oxy-gen *** results showed that the high-quality ZGO films with good uniformity,high visible light transmittance,low roughness,and significant reduction of oxygen vacancies were obtained after ***,metal-semiconductor-metal PDs were prepared based on the studied ZGO *** responsivity(R),detectivity(D*),and external quantum efficiency(EQE)of the optimized device are 61.8 A W-1,1.2 x 1012 Jones,and 255.9％,*** to the unannealed device,the an-nealed ZGO PD achieves a maximum 309-fold increase in *** thermal engineering work may provide a strong reference for the development of low-cost,large-area,high-performance ultraviolet *** it also broadens the application of ternary metal oxides in optoelectronics.

关键词： Atomic layer deposition Oxygen annealing ZGO thin films Photodetector Ultraviolet detection

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Gain-bandwidth-product-induced technical bound in time transfer system without inline amplifiers

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Journal of Applied Physics 2025年第16期137卷

作者： Zhang, Yufei Chen, Ziyang Guo, Hong State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

Time transfer plays a dispensable role in many fields including navigation and positioning, geodesy, and fundamental tests. However, in certain scenarios where effective relay node deployment is often not feasible, such as harsh environments with extremely poor infrastructure and emergency conditions, effective time transfer without inline amplifiers becomes crucial. In this situation, the maximum transmission distance is limited by the receiver’s measurement capability, particularly its ability to amplify the signal. Here, we propose a theoretical model, giving a technical lower bound of the detected signal stability at different transmission distances, induced by limited gain-bandwidth products. The results under common gain-bandwidth products show that while for shorter transmission distances, stability is mainly limited by the background noise of the time interval counter, for longer distances reaching the scale of 300 km, the technical lower bound is below the level of 10 ns without any inline amplification devices. Therefore, the given technical bound offers guidance on managing the balance between distance and stability, together with the optimization of the receiver in long-distance time transfer without inline amplification. © 2025 Author(s).

关键词： Geodesy

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Adaptive Suppression Method for Aeromagnetic Interference Based on Dual Magnetic Sensors

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IEEE Transactions on Instrumentation and Measurement 2025年 74卷

作者： Du, Changping Peng, Xiang Guo, Hong Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Beijing100871 China

Aeromagnetic compensation plays an important role in airborne magnetic anomaly detection (MAD). In recent years, aeromagnetic compensation has developed from the initial coarse compensation stage to the current refined compensation stage. With the deepening of the understanding of interference sources, the compensation accuracy is progressively improved. Nevertheless, further enhancement is confronted with the problems of unknown interference sources and strong coupling. Facing this problem, this article proposes an adaptive noise suppression algorithm based on dual magnetic sensors (ANSD). First, a general compensation model (GCM) is adopted to compensate the magnetic data collected by the dual magnetic sensors installed on the aircraft to remove the magnetic interference that can be modeled and compensated. Then, a noise suppression method is developed by making use of the correlations in the recombined data, which amplifies both the common components of the magnetic field data from the two sensors and the differential components of the remaining magnetic field data. Considering the time-varying nature of the magnetic noise, an adaptive noise suppression algorithm is formed by continuously solving the filtering parameters through a sliding window. Field tests demonstrate that this algorithm can effectively reduce the magnetic interference, the standard deviation (SD) of the residual magnetic interference after processing is consistently held below 8 pT in the calibration flight, and the magnetic interference compensation ability is about 2-3 times more than that of the traditional magnetic compensation method. © 1963-2012 IEEE.

关键词： Magnetic sensors

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Wavelength-tunable, mid-infrared ultrafast pulse generation through Raman self-frequency shift in an all-solid fluorotellurite fiber

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Optics Letters 2025年第8期50卷 2586-2589页

作者： Sun, Weiyi Jiao, Yadong Huang, Jiapeng Jia, Zhixu Chen, Liming Huang, Zhiyuan Jiang, Xin Leng, Yuxin Qin, Guanshi Pang, Meng Russell Centre for Advanced Lightwave Science Hangzhou Institute of Optics and Fine Mechanics Shanghai Institute of Optics and Fine Mechanics Hangzhou311421 China Shanghai201800 China School of Physical Science and Technology Shanghai Tech University Shanghai200031 China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun130012 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

We report a mid-infrared (mid-IR) fiber laser system that can deliver ultrafast soliton-like pulses with a wavelength tunable from 2.8 to 4.0 μm. The pump light source of the system is a mid-IR fiber laser mode-locked at 2.8 μm, which has an average output power of ∼500mW, a repetition rate of ∼30 MHz, a pulse energy of ∼15 nJ, and a pulse duration of ∼150 fs. The pump light was then launched into a short (∼70 cm) sample of fluorotellurite (TeO2-BaF2-Y2O3) glass fiber as the high-nonlinearity waveguide with simultaneously good features of large Raman gain, tailored dispersion, and high-power capability. High-efficiency Raman soliton self-frequency-shift phenomenon can be obtained in this short fiber sample, leading to the generation of broadband tunable (3-4 μm), mid-IR pulses with hundreds-of-fs pulse duration and tens-of-mW average power, corresponding to a pulse energy level of ∼1 nJ. The frequency-conversion efficiency inside the nonlinear fiber was measured to be as high as ∼16%. The present system, combining the advanced techniques of fluorotellurite fiber fabrication and mid-IR ultrafast fiber laser, highlights its application potentials for generating low-noise, high-beam-quality, mid-IR ultrafast pulses with a compact fiber configuration. © 2025 Optica Publishing Group.

关键词： Fiber lasers

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A Symmetric Differential Algorithm for Detecting the Action state of an Elevator Brake 14th

A Symmetric Differential Algorithm for Detecting the Action ...

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14th International Workshop of Advanced Manufacturing and Automation, IWAMA 2024

作者： Zhang, Fusheng Du, Jiangbing Wu, Jian Chen, Xiangjun School of Smart Elevator Industry Changshu Institute of Technology Suzhou215500 China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China Zhejiang Academy of Special Equipment Science Hangzhou310020 China

ISBN: (纸本)9789819626243

The elevator brake is an important device to ensure the safety of the elevator, and is the basis to ensure the safe and smooth operation of the elevator. Its main function is to keep the car stationary when the elevator stops running, and to enable the running elevator to automatically stop the car in the case of power failure, its important position is like the brake device of the car, to ensure its reliable performance. The type test method is usually used to detect the performance of the elevator brake in our country. Due to the external influence of the equipment structure, the test parameters have one-sidedness and can not detect the performance of the elevator brake comprehensively and accurately. The traditional brake testing and testing is manual, and the choice of the distance, position and consumables of the brake lining mainly depends on the subjective experience of the operator, so it is difficult to achieve a unified standard in the maintenance and testing process. In order to solve the above technical problems, the symmetric difference algorithm of elevator brake action state detection is proposed to realize intelligent detection and improve the reliability and accuracy of detection. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Subjective testing

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Secure encryption system based on quantum access network 4

Secure encryption system based on quantum access network

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4th International Computational Imaging Conference, CITA 2024

作者： Liu, Yuchao Wang, Tao Xu, Yuehan Zeng, Guihua State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai200240 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Hefei National Laboratory CAS Center for Excellence in Quantum Information and Quantum Physics Hefei230026 China

ISBN: (纸本)9781510688834

Quantum secure communication technology, grounded in the principles of quantum mechanics, has revolutionized traditional cryptographic methods, which predominantly rely on mathematical algorithms and logical transformations. Quantum key distribution (QKD) facilitates the secure sharing of symmetric keys between legitimate parties, ensuring the integrity and confidentiality of information in communication channels. Among various QKD schemes, continuous variable quantum key distribution (CV-QKD) has emerged as a viable alternative to the more established discrete variable quantum key distribution (DV-QKD). CV-QKD boasts several advantages, including straightforward deployment, reduced operational costs, and stable signal quality, positioning it as a significant component of the quantum communication *** noise stream cipher (QNSC) represents a technique that employs redundant data streams to encrypt plaintext. Notably, QNSC shares structural similarities with the optical path used in quantum key distribution, allowing for compatibility with existing QKD infrastructure. Furthermore, the keys generated through quantum key distribution ensure absolute security, enabling them to substitute the data streams produced by pseudo-random sequences traditionally used in classical encryption schemes. This substitution enhances the overall security framework of the quantum noise stream encryption *** quantum access network (QAN) extends quantum key distribution capabilities from point-to-point connections to point-to-multipoint configurations, thereby becoming an essential component of contemporary network architectures. By interlinking multiple end users with a network backbone, quantum access networks can seamlessly integrate with quantum key distribution protocols. This integration offers a cost-effective and scalable solution for user access to the *** experimental verifications have demonstrated the viability of downstream access networks,

关键词： Quantum noise

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