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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Shen, Bitao Shu, Haowen Xie, Weiqiang Chen, Ruixuan Liu, Zhi Zhang, Xuguang Wang, Yimeng Zhang, Yunhao Cheng, Buwen Yu, Shaohua Bowers, John E. Chang, Lin Wang, Xingjun State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing100871 China Department of Electrical and Computer Engineering University of California Santa BarbaraCA93106 United States Frontiers Science Center for Nano-Optoelectronics Peking University Beijing100871 China Peng Cheng Laboratory Shenzhen518055 China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

Massively parallel optical chaotic sources with large bandwidth are demonstrated based on chaotic microcombs in the AlGaAsOI platform. 30-channel parallel random bit generation with 30 Gbit/s per channel is realized b... 详细信息

ISBN: (纸本)9781957171258

关键词： Gallium compounds

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Dynamic monitoring of few-mode long-period fiber gratings using swept-wavelength interferometry

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Optics letters 2025年第12期50卷 3954-3957页

作者： Huihui Wang Bingyi Zhao Yuehui Ma Miaomiao Tang Xutao Wang Zongcheng Zhang Zhiqun Yang Yaping Liu Zhanhua Huang Yunqi Liu Lin Zhang State Key Laboratory of Precision Measuring Technology and Instruments Key Laboratory of Opto-Electronic Information Technology of Ministry of Education Tianjin Key Laboratory of Integrated Opto-Electronics Technologies and Devices School of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin 300072 China The Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai University Shanghai 200444 China yangzhiqun@*** Peng Cheng Laboratory Shenzhen 518038 China lin_zhang@***

We present the dynamic monitoring of long-period fiber gratings (LPFGs) using swept-wavelength interferometry (SWI) for the first time, to our knowledge, including both grating fabrication and its environmental responses. One type of LPFGs designed for mode conversion is fabricated by applying pressure to a few-mode fiber. SWI tests provide mode-dependent losses (MDLs), insertion losses (ILs), and mode conversion efficiencies (MCEs) of the LPFG across the C-band. The LPFG exhibits a maximum MCE of 80.73% at 1550 nm, with an MDL of 0.08 dB and an IL of 0.62 dB. This approach enables the high-quality fabrication of LPFGs and is applicable to various fabrication techniques. Also, dynamic thermal responses of LPFGs are monitored using SWI, which reveals a highly linear relationship (R = 0.99) between mode cross talk (XT) and temperature, providing a new approach for LPFG-based temperature sensing.

关键词： Beam splitters Carbon dioxide lasers Few mode fibers Long period fiber gratings Mode conversion optical signal to noise ratio

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Miniaturized Terahertz Source Based on Micro-nano-grating Dielectric Waveguide

Miniaturized Terahertz Source Based on Micro-nano-grating Di...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Ji-Tao Yang Chao-Hai Du Zi-Wen Zhang Shao-Meng Wang Center for Carbon-based Electronics and State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China National Key Laboratory of Science and Technology on Vacuum Electronics University of Electronic Science and Technology of China Chengdu China

In recent years, with the continuous progress of science and technology, terahertz technology has been widely applied. In the preparation of terahertz sources, vacuum electronics technology has always been one of the main research directions. However, the traditional vacuum electronic light source has some shortcomings, such as high energy consumption, easy to damage the crystal and easy to be subjected to environmental noise. Therefore, how to achieve miniaturized, high-efficiency and low-cost terahertz light sources has always been the focus of researchers' attention. In this respect, the miniaturized terahertz source based on micro-nano-grating dielectric waveguide provides us with a new solution. We construct a terahertz source based on a micro-nano-grating dielectric waveguide with an operating frequency of 32THz, which can be driven by single electrons, electron bunches and periodic electron sequences. In addition, the miniaturized terahertz source has the advantages of easy integration and low preparation cost. It can be used in terahertz optics, communication, development, biomedical engineering and other fields.

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High-precision FMCW ranging with a hybrid-integrated external cavity laser

High-precision FMCW ranging with a hybrid-integrated externa...

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OptoElectronics and communications Conference, OECC

作者： Chuxin Liu Ruiyang Xu Weihan Xu Liangjun Lu Yuyao Guo Yu Li Jianping Chen Linjie Zhou Department of Electronic Engineering State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Lab of Navigation and Location Services Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong University Shanghai China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu China Shanghai China

We implement an analog EO-PLL for a III/V-Si 3 N 4 hybrid integrated ECL to generate a highly-linear FMCW signal over multiple wavelengths. A high range precision of 4.2 cm is achieved for a 200-m distance.

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A Nonuniform Quantization Scheme based on optical Phase-shifted Devices

A Nonuniform Quantization Scheme based on Optical Phase-shif...

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2021 Asia communications and Photonics Conference, ACP 2021

作者： Hu, Feifan Bi, Meihua Xu, Hangyong Miao, Xin Hu, Weisheng School of Communication Engineering Hangzhou Dianzi University Xiasha Gaojiaoyuan 2rd Street Zhe Jiang province Hangzhou310018 China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University 800 Dongchuan Rd Shanghai200240 China

We firstly present a nonuniform quantization scheme based on phase-shifted devices used in photonic ADC, which can be used to process the unevenly distributed sampling signals. And, its feasibility is verified by simu... 详细信息

ISBN: (纸本)9781957171005

关键词： Quantization (signal)

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Experimental Demonstration of 16D Voronoi Constellation with Two-Level Coding over 50km Four-Core Fiber

arXiv

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arXiv 2024年

作者： Zhao, Can Chen, Bin Cai, Jiaqi Liang, Zhiwei Lei, Yi Xiong, Junjie Ma, Lin Hu, Daohui Sun, Lin Shen, Gangxiang School of Computer Science and Information Engineering Hefei University of Technology Hefei China School of Electronic and Information Engineering Soochow University Suzhou China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

A 16-dimensional Voronoi constellation concatenated with multilevel coding is experimentally demonstrated over a 50 km four-core fiber transmission system. The proposed scheme reduces the required launch power by 6 dB and provides a 17 dB larger operating range than 16QAM with BICM at the outer HD-FEC BER threshold. © 2024, CC BY-NC-SA.

关键词： Digital television

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Automatic phase compensation of a continuous-variable quantum-key-distribution system via deep learning

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Physical Review A 2023年第6期107卷 062614-062614页

作者： Zhe-Kun Zhang Wei-Qi Liu Jin Qi Chen He Peng Huang School of Information Science and Technology Northwest University Xi'an 710127 Shaanxi People's Republic of China Center for Quantum Sensing and Information Processing State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 People's Republic of China

In a practical continuous-variable quantum-key-distribution (CVQKD) system, it is vital to accurately evaluate and then compensate for the phase drifts of the signals, so that the involved system can achieve better performance and stability. In this paper, based on the long short-term memory network (LSTM) model, an automatic phase compensation approach of the CVQKD system is proposed. The LSTM model is first trained to predict the phase drift value of the quantum signal relative to the local oscillator over time. Then, the predicted phase drift value can be used by Alice to reconstruct her data. Finally, Alice and Bob can obtain the raw key, so that the CVQKD system can achieve enhancements in terms of performance and stability. The experimental results indicate that the proposed LSTM-based automatic phase compensation algorithm can accurately predict the phase drift value and perform phase compensation instead of real-time phase drift measurement, which improves the performance of the CVQKD system without requiring any additional quantum resources and extra experimental hardware.

关键词： Quantum communication

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Temperature insensitive refractive index sensor based on long-period fiber gratings in capillary

Temperature insensitive refractive index sensor based on lon...

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2021 Asia communications and Photonics Conference, ACP 2021

作者： Tang, Mengxue Zhao, Yunhe Wang, Wei Yang, Yongsheng He, Zuyuan Institute of Logistics Science and Engineering Shanghai Maritime University Shanghai201306 China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

We proposed a refractive index (RI) sensor based on arc-discharged long-period fiber gratings in capillary. Sensing performance of the gratings have been investigated experimentally. The proposed RI sensor is insensit... 详细信息

ISBN: (纸本)9781957171005

关键词： Refractive index

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Topological Unidirectional Guided Resonances Emerged from Interband Coupling

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Physical Review Letters 2023年第5期130卷 056401-056401页

作者： Xuefan Yin Takuya Inoue Chao Peng Susumu Noda Department of Electronic Science and Engineering Kyoto University Kyoto-Daigaku-Katsura Nishikyo-ku Kyoto 615-8510 Japan State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics and Frontiers Science Center for Nano-optoelectronics Peking University Beijing 100871 China Peng Cheng Laboratory Shenzhen 518055 China

Unidirectional guided resonances (UGRs) are optical modes in photonic crystal slabs that radiate toward one side without the need for mirrors on the other. In this Letter, we report a mechanism to realize UGRs by tuning the interband coupling effect originating from up-down symmetry breaking. We theoretically find that UGRs that reside along high-symmetric lines correspond to phase singularities of far-field radiation, depicted by phase winding numbers as a type of topological indices. We investigate the phase dislocation lines in three-dimensional parameter space and elaborate on the interplay between UGRs and non-Hermitian degeneracies accordingly. Our findings reveal the topological nature of UGRs about their generation, evolution, and annihilation in general parameter spaces, thus paving the way to new possibilities of light manipulation.

关键词： Electric polarization Phononic crystals Photonics Topological effects in photonic systems Polarization Band structure methods

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Holographic-Pattern Based Multi-User Beam Training in RHS-Aided Hybrid Near-Field and Far-Field communications

arXiv

引用

arXiv 2024年

作者： Zhang, Shupei Di, Boya Kaushik, Aryan Eldar, Yonina C. State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China The Department of Computing & Mathematics Manchester Metropolitan University United Kingdom The Faculty of Mathematics and Computer Science Weizmann Institute of Science Rehovot7610001 Israel

Reconfigurable holographic surfaces (RHSs) have been suggested as an energy-efficient solution for extremely large-scale arrays. By controlling the amplitude of RHS elements, high-gain directional holographic patterns can be achieved. However, the complexity of acquiring real-time channel state information (CSI) for beamforming is exceedingly high, particularly in large-scale RHS-assisted communications, where users may distribute in the near-field region of RHS. This paper proposes a one-shot multi-user beam training scheme in large-scale RHS-assisted systems applicable to both near and far fields. The proposed beam training scheme comprises two phases: angle search and distance search, both conducted simultaneously for all users. For the angle search, an RHS angular codebook is designed based on holographic principles so that each codeword covers multiple angles in both near-field and far-field regions, enabling simultaneous angular search for all users. For the distance search, we construct the distance-adaptive codewords covering all candidate angles of users in a real-time way by leveraging the additivity of holographic patterns, which is different from the traditional phase array case. Simulation results demonstrate that the proposed scheme achieves higher system throughput compared to traditional beam training schemes. The beam training accuracy approaches the upper bound of exhaustive search at a significantly reduced overhead. Copyright © 2024, The Authors. All rights reserved.

关键词： Beamforming

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