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16th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies, UCMMT 2023

作者： Lei, Yu-Lu Du, Chao-Hai Zhang, Zi-Wen Zhu, Juan-Feng Peking University Center for Carbon-Based Electronics School of Electronics Beijing100871 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics China Singapore

ISBN: (纸本)9798350339406

Vortex beams propagate with inherent orbital angular momentum, which can be harnessed for terahertz manipulation, measurement, and communications. Nonetheless, achieving the high-purity generation of high-order topological charges poses a persistent challenge in terms of tunability and operation bandwidth. To overcome these limitations, this paper presents a theoretical and experimental demonstration of a methodology for generating high-order topological charges in emitted vortex Smith-Purcell radiation based on the Bragg law in multi-period systems. The proposed approach offers an alternative means to manipulate vortex free-electron radiation for multi-channel applications, enabling the chiral THz spectroscopy and emissions. © 2023 IEEE.

关键词： Vortex flow

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Simplified single-end Rayleigh and Brillouin hybrid distributed fiber-optic sensing system

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Science China(Information Sciences) 2023年第2期66卷 291-292页

作者： Linjing HUANG Zuyuan HE Xinyu FAN State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University Peng Cheng Laboratory

Dear editor,Distributed fiber-optic sensing(DFOS) technology has been widespread applications in many fields. It is mainly realized by analyzing three kinds of backscattering in optical fibers: Rayleigh, Brillouin, and Raman [1]. Conventionally,the sensing system can only measure one type of parameter:a static one like temperature and strain or a dynamic one like vibration. However, for several applications, such as railway safety monitoring systems, both static and dynamic parameters must be measured simultaneously not only for early warning applications but also for collecting static signals to perform long-term analysis.

关键词： Hybrid systems

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Maniputing Brillouin Scattering on Chip Using Suspended Anti-Resonant Acoustic Waveguides

Maniputing Brillouin Scattering on Chip Using Suspended Anti...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Peng Lei Mingyu Xu Yunhui Bai Zhangyuan Chen Xiaopeng Xie State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China

Inspired by the anti-resonant properties of hollow-core fibers, we introduce suspended anti-resonant acoustic waveguides for on-chip phonon confinement and selection. It enables record-breaking achievements in forward... 详细信息

ISBN: (纸本)9798350369311

关键词： Acoustic waveguides Waveguide lasers Phonons Lasers and electrooptics Acoustics Brillouin scattering system-on-chip Electro-optical waveguides Fiber lasers

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Slow Light Enhanced on-chip Stimulated Brillouin Scattering

Slow Light Enhanced on-chip Stimulated Brillouin Scattering

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Conference on Lasers and Electro-Optics (CLEO)

作者： Mingyu Xu Peng Lei Yunhui Bai Zhangyuan Chen Xiaopeng Xie State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China

We report slow-light enhancement of stimulated Brillouin scattering on SOI for the fisrt time. With suspended Bragg grating structure, the device achieve a 2.1-fold of Brillouin gain coeffiecient.

ISBN: (纸本)9798350369311

We report slow-light enhancement of stimulated Brillouin scattering on SOI for the fisrt time. With suspended Bragg grating structure, the device achieve a 2.1-fold of Brillouin gain coeffiecient.

关键词： Bragg gratings Slow light Measurement by laser beam Waveguide lasers Electro-optic effects Silicon Brillouin scattering system-on-chip Electro-optical waveguides

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Speckle-Based Residual Optronic Convolutional Neural Network for SAR Target Recognition in Scattering Imaging Scenarios

Speckle-Based Residual Optronic Convolutional Neural Network...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Zicheng Huang Fengyuan Hu Lingyu Wang Guozheng Xu Mengyang Shi Yesheng Gao State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9798350360325

ISBN: (纸本)9798350360332

Scattering imaging is a pervasive scenario in many areas, especially challenging the performance of remote sensing and automatic target recognition (ATR). Recently, deep learning was utilized for synthetic aperture radar (SAR) ATR in scattering scenarios by extracting the feature of speckle patterns. However, huge computational costs and power consumption challenge its development. Here, we develop a speckle-based residual optronic convolutional neural network (S-ROPCNN) for SAR target recognition. Specifically, we model the light scattering scenarios and build the optical imaging system to produce the speckle patterns for network training. The S-ROPCNN performs SAR target recognition in optical platforms with the speed of light, low computational cost, and low energy consumption. Experiments on the Moving and Stationary Target Acquisition and Recognition (MSTAR) dataset demonstrate the feasibility of S-ROPCNN for SAR target recognition in scattering imaging scenarios.

关键词： Image recognition Power demand Target recognition Scattering Speckle Feature extraction optical imaging

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laboratory Simulation of Electromagnetic Radiation Signals from Distribution Network Faults using USRP

Laboratory Simulation of Electromagnetic Radiation Signals f...

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International Conference on Microwave and Millimeter Wave Technology Proceedings

作者： Jie Ma Zhuo Wang Xu Zhao Lianlin Li State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China

ISBN: (数字)9798350389968

ISBN: (纸本)9798350389975

Distribution networks exhibit a significantly higher failure probability compared to transmission networks, thereby constituting the primary source of power system disruptions. The early detection and diagnosis of anomalies within these networks are paramount to ensure timely maintenance and to facilitate the swift restoration of power electronic systems. Monitoring the electromagnetic signals emitted by the distribution network enables the assessment of its operational state and facilitates the prognostication of potential faults. However, the sporadic nature of these faults presents a challenge in amassing data solely from real-world occurrences, underscoring the necessity of simulating fault signal generation within a controlled laboratory environment. This paper advocates for the utilization of Universal Software Radio Peripheral (USRP) technology to synthesize fault signals. It further corroborates the viability of this approach by juxtaposing the empirical outcomes with theoretical predictions.

关键词： Deep learning Partial discharges Simulation Prevention and mitigation Distribution networks Electromagnetic radiation Power electronics

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Condition Monitoring of Distribution networks Based on Radiated Electromagnetic Signals

Condition Monitoring of Distribution Networks Based on Radia...

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IEEE International Conference on Computational Electromagnetics (ICCEM)

作者： Jie Ma Lianlin Li State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China

ISBN: (数字)9798350383317

ISBN: (纸本)9798350383324

The reliable operation of the distribution network is intricately linked to the overall stability of the power system. However, existing methodologies often fall short in precisely identifying the fault location within the electricity distribution network and providing timely warnings prior to the occurrence of faults. The development of electromagnetic sensing theory and artificial intelligence algorithms has provided a new method for the monitoring of distribution networks. To address the inverse problem, this work investigates the field distribution around the distribution network, analyzes the characteristics of the power frequency electromagnetic field and partial discharge field. Furthermore, it conducts an analysis of the feasibility of using electromagnetic sensing theory to monitor the operational status of the distribution network.

关键词： Partial discharges Distribution networks Power system stability Reliability theory Stability analysis Sensors Power system reliability

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Wavelength-Selective 2 × 2 optical Switch Based on a Ge2Sb2 Te5-Assisted Microring for the 2-μm Wavelength Band

Wavelength-Selective 2 × 2 Optical Switch Based on a Ge2Sb2...

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2023 Asia communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Zhu, Weixun Yang, Xing Li, Huan Lu, Liangjun Zhou, Linjie Dai, Daoxin Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Lab of Navigation and Location Services Department of Electronic Engineering Shanghai200240 China College of Optical Science and Engineering International Research Center for Zhejiang University State Key Laboratory for Modern Optical Instrumentation Center for Optical & Electromagnetic Research Zijingang Campus Hangzhou310058 China Ningbo Research Institute Zhejiang University Ningbo315100 China

We propose and demonstrate a wavelength-selective 2 ×2 silicon photonic switch using a Ge2Sb2Tes-assisted microring-resonator for the 2-μm wavelength-band, showing an extinction ratio of 20 dB and a low excess l... 详细信息

ISBN: (纸本)9798350312614

关键词： Ge2Sb2Te5 (GST) microring-resonator (MRR) optical switch silicon photonics

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$1.2\text{-Tb}/\mathrm{s}/\lambda$ IM/DD optical Interconnects with Stokes Vector Receiver

$1.2\text{-Tb}/\mathrm{s}/\lambda$ IM/DD Optical Interconnec...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Xiansong Fang Yixiao Zhu Lingjun Zhou Yunchen Li Chuanchuan Yang Xian Zhou Weisheng Hu Zhixue He Lei Wang Ke Li Fan Zhang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Peking University Beijing China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China Pengcheng Laboratory Shenzhen China Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services University of Science and Technology Beijing Beijing China

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

We demonstrate the first $\mathbf{1.2}\mathbf{Tb}/\mathbf{s}/\boldsymbol{\lambda}$ line rate IM/DD optical interconnects using ultra-high-order modulation and Stokes vector receiver. This achievement utilizes polarization division multiplexing and 154-GBd PS-PAM20 signaling, resulting in a net $\mathbf{932}\mathbf{Gb}/\mathbf{s}/\boldsymbol{\lambda}$ transmission record.

关键词： Multiplexing optical interconnections Spectral efficiency Bit rate Asia Modulation Receivers Manuals Vectors Photonics

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Direct detection with an optimal transfer function:toward the electrical spectral efficiency of coherent homodyne detection

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Opto-Electronic Science 2025年第2期4卷 1-15页

作者： Xingfeng Li Jingchi Li Xiong Ni Hudi Liu Qunbi Zhuge Haoshuo Chen William Shieh Yikai Su State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Nokia Bell Labs 600 Mountain AveMurray HillNJ 07974USA School of Engineering Westlake UniversityHangzhou 310030China

Complex-valued double-sideband direct detection(DD)can reconstruct the optical field and achieve a high electrical spectral efficiency(ESE)comparable to that of a coherent homodyne receiver,and DD does not require a costly local oscillator ***,a fundamental question remains if there is an optimal DD receiver structure with the simplest design to approach the performance of the coherent homodyne *** study derives the optimal DD receiver structure with an optimal transfer function to recover a quadrature amplitude modulation(QAM)signal with a near-zero guard band at the central frequency of the *** derive the theoretical ESE limit for various detection schemes by invoking Shannon’s *** proposed scheme is closest to coherent homodyne detection in terms of the theoretical ESE *** leveraging a WaveShaper to construct the optimal transfer function,we conduct a proof-of-concept experiment to transmit a net 228.85-Gb/s 64-QAM signal over an 80-km single-mode fiber with a net ESE of 8.76 b/s/*** the best of our knowledge,this study reports the highest net ESE per polarization per wavelength for DD transmission beyond 40-km single-mode *** a comprehensive metric,denoted as 2ESE×Reach,we achieve the highest 2ESE×Reach per polarization per wavelength for DD transmission.

关键词： optical communication direct detection optical field recovery electrical spectral efficiency

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