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IEEE International Conference on Group IV Photonics

作者： Hua Zhong Jingchi Li Yu He Meng Tian Yong Zhang Yikai Su Department of Electronic Engineering State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We demonstrate a silicon TO switch based on photonic crystal nanobeam cavity with doped-silicon heaters. The insertion loss and crosstalk are less than 2.01 dB and -9.78 dB, respectively. The thermo-optic tuning effic... 详细信息

ISBN: (数字)9798331506186

ISBN: (纸本)9798331506193

关键词： Heating systems optical losses Crosstalk Switches Photonic crystals Insertion loss Silicon photonics Foundries Tuning Standards

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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 lab.led failure data, DT-LSV utilizes normal data, and as lab.led 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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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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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 scalab.e 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 scalab.e 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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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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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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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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Performance Improvement of Adaptive N-Square PS-QAM Based on LUT for Flexible Coherent PON

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Journal of Lightwave Technology 2025年

作者： Lin, Gengming Zhu, Yixiao Yan, Zijun Cheng, Ziyu Zhuge, Qunbi Hu, Weisheng Shanghai Jiao Tong University State Key Lab of Advanced Optical Communication Systems and Networks School of Electronic Information and Electrical Engineering Department of Electronic Engineering Shanghai200240 China

Flexible coherent passive optical network (PON) is recognized as an advanced capacity optimization strategy for beyond 100G PON due to its flexibility and adaptability, which are pivotal for the evolution of high-capacity optical access networks. In this study, we propose an adaptive N-square QAM scheme compatible with probabilistic shaping (PS), enabling a more continuous variation of shaping entropy compared to standard 2M-QAM shaping scheme and improved frequency offset estimation (FOE) accuracy in blind 4th-power Fast-Fourier-transform (FFT) algorithm. In experimental demonstrations, dynamic-range and data-rate product (DRDRP) of uniform N2-QAM surpasses that of uniform 2M-QAM by 86 dB·Gbps. The DRDRP of PS N2-QAM also outperforms that of PS 2N-QAM by around 41 dB·Gbps. The development of PON optimization scheme for multi-carrier transmission is achieved through the generation of a look-up table (LUT) based on channel signal-to-noise ratio (SNR) conditions. The feasibility of the LUT is demonstrated under different super-Gaussian filter parameter settings at the back-to-back (B2B) scenario. After 20-km standard single-mode fiber (SSMF) transmission, the normalized generalized mutual information (NGMI) is greater than 0.985 across four subcarriers with varying received optical power (ROP) from -16 to -11 dBm. © 2025 IEEE.

关键词： Single mode fibers

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