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CLEO: Science and Innovations, S and I 2022

作者： Liu, Shuting Liu, Qingwen Zhao, Shuangxiang He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University 800 Dongchuan Road Minhang Shanghai200240 China

A fiber grating strain sensing system based on self-reference mechanism was developed. The resolution is 34.6pΕ/√Hz at 1kHz, which is several orders of magnitud better than traditional FBG systems. © Optica Pub...

ISBN: (纸本)9781557528209

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Missing Data Prediction Using LSTM for Radio Frequency Transfer system

Missing Data Prediction Using LSTM for Radio Frequency Trans...

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2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2023

作者： Cheng, Jiahui Gao, Hao Liu, Chenxia Zhao, Zhuoze Qiao, Yaojun Luo, Bin Yu, Song Guo, Hong Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China North China Electric Power University Department of Electronic and Communication Engineering Baoding071066 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Beijing100871 China

ISBN: (纸本)9798350311426

Missing data affects stability analysis of Radio Frequency (RF) transfer system. In this paper, a missing data prediction method using Long Short-Term Memory (LSTM) network is proposed for the short-term failure in RF transfer system. The performance is verified by experimenting on the measurement data of 2.4 GHz RF transfer system using 3000 km single optical fiber bi-directionally. The results demonstrate that our proposed method can achieve higher prediction accuracy compared to back propagation neural network (BPNN) and Support Vector Regression (SVR). When the prediction time is 240 s, the Root Mean Squared Error (RMSE) between the predicted value and the actual value is less than 0.001. This provides an effective and feasible method to impute missing data for RF transfer system. © 2023 IEEE.

关键词： frequency transfer Long Short-Term Memory network missing data prediction

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Free-induction-decay 4He magnetometer using a multipass cell

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Physical Review Applied 2024年第1期22卷 014084-014084页

作者： Kaiwen Yi Yang Liu Bowen Wang Wei Xiao Dong Sheng Xiang Peng Hong Guo State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics and Center for Quantum Information Technology Department of Precision Machinery and Precision Instrumentation Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes

optically pumped magnetometers (OPMs) based on the free-induction-decay (FID) configuration have recently attracted interest owing to their advantages, such as being calibration-free, easy to operate, and showing reduced light shifts induced by the pump light. Currently, alkali-metal vapor cells have been employed in most of the FID magnetometers. However, the relatively narrow linewidth of the magnetic resonance signal and nonlinear Zeeman (NLZ) effects generate bandwidth limitation and heading errors of these magnetometers in the Earth’s field, respectively. In this work, we propose a 4He-based FID magnetometer, which not only has the advantages of being NLZ-free and showing a high bandwidth, but also maintains an enhanced sensitivity assisted by a multipass cell. This magnetometer demonstrates a magnetic field noise floor of 0.34pT/Hz1/2 with a Nyquist-limited bandwidth of 5 kHz, which opens another route for atomic magnetometry using FID signals, and exhibits potential for applications in high-frequency magnetic field detection, such as biomagnetic measurements and magnetic communications in the geomagnetic field.

关键词： Atomic & molecular processes in external fields Magnetometry optical pumping Polarization of light Spin polarization Atomic ensemble Medical imaging optically detected magnetic resonance

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Statistical Characteristics of Distributed Modal Crosstalk for Weakly-Coupled FMF Transmission

Statistical Characteristics of Distributed Modal Crosstalk f...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Qiao, Gang Zuo, Mingqing Zhang, Jiarui Long, Chengbin He, Yongqi Chen, Zhangyuan Li, Juhao State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China Department of Fundamental Network Technology China Mobile Research Institute Beijing100053 China Peng Cheng Laboratory Shenzhen518055 China

We experimentally show that noise induced by the distributed modal crosstalk in weakly-coupled FMFs is well approximated by Gaussian distribution. Its impact on weakly-coupled MDM transmission systems is experimentall... 详细信息

ISBN: (纸本)9781957171258

关键词： Crosstalk

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Implementation of 400 Gbps quantum noise stream cipher encryption for 1520 km fiber transmission using end-to-end deep learning

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Optics Letters 2025年第12期50卷 3808-3811页

作者： Xie, Yunhao Huang, Xianran Xu, Guozhi Xiao, Junzhe Shi, Mengyue Hu, Weisheng Yi, Lilin State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China

In the era of large models and big data, the security of optical fiber communication backbone networks has garnered significant attention. Quantum noise stream cipher (QNSC) stands as a crucial method for safeguarding the physical layer security of optical fiber communications, yet the current schemes lag behind the rate capabilities of existing 400G optical fiber backbone networks. In this paper, we introduce deep learning into QNSC and propose an end-to-end quantum noise stream cipher (E2E-QNSC) scheme, which encrypts 16 quadrature amplitude modulation (QAM) into E2E-65536QAM/QNSC. Our experiments successfully demonstrate secure optical communication with a single-channel rate of 400 Gbps, a total capacity of 8.4 Tbps, and a transmission distance of 1520 km. Even in the most extreme scenarios, the detection failure probability (DFP) of the scheme remains at an excellent level greater than 0.9999, proving the security of the approach. The experimental results presented herein represent the highest rate–distance product record of QNSC secure transmission systems, to the best of our knowledge. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Quadrature amplitude modulation

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Antiresonant Fabry-Pérot cavity with ultralow finesse

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Physical Review A 2023年第2期107卷 023517-023517页

作者： Tiantian Shi Jianxiang Miao Jia Zhang Jingbiao Chen State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum Electronics School of Electronics Peking University Beijing 100871 China

The exact expressions of finesse and full width at half maximum (FWHM) of the Airy distribution of a Fabry-Pérot (FP) resonator are derived, which solves the breakdown problem at ultralow reflectivity in traditional formulas. We demonstrate that, when the cavity-mirror reflectivity R→0, the FWHM approaches half of the free spectral range rather than infinity; moreover, the cavity finesse F approaches 2 rather than zero. These expressions are useful for the development of bad-cavity lasers, such as the four-level active optical clock based on the strong atomic transition of cesium. Also, the exact expressions of the FWHM and finesse of the reflection distribution composed of reflected mode profiles are derived, which separately intersect with that of the Airy one at R=0. In addition, the characteristics of an antiresonant cavity, the frequency of which is exactly at the center of two adjacent resonant cavity modes, are analyzed. It is demonstrated that at the resonant and antiresonant frequencies the enhancement and inhibition of intracavity light intensity caused by the FP cavity are symmetrical in the logarithmic view. Furthermore, we provide a universal expression of the cavity-enhancement factor rather than the classical representation of “2F/2Fππ,” which is inadequate for the high-loss cavity because the cavity-enhancement factor should naturally reach 1 when R→0. Finally, we extend the application of the antiresonant cavity to an inhibited laser, the frequency of which has a stronger suppression effect on the cavity-length thermal noise than the traditional resonant laser.

关键词： Atom lasers Lasers Optics & lasers Quantum optics

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Ultra-low-loss multi-layer 8×8 microring optical switch

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Photonics Research 2023年第5期11卷 712-723页

作者： XIN LI WEI GAO LIANGJUN LU JIANPING CHEN LINJIE ZHOU State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and LocationServicesShanghai Institute for Advanced Communication and Data ScienceDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu 314200China

Microring-based optical switches are promising for wavelength-selective switching with the merits of compact size and low power ***,the large insertion loss,the high fabrication,and the temperature sensitivity hinder the scalability of silicon microring optical switch *** this paper,we utilize a three-dimensional(3D)microring-based optical switch element(SE)on a multi-layer Si_(3)N_(4)-on-SOI platform to realize highperformance large-scale optical switch *** 3D microring-based SE consists of a Si∕Si_(3)N_(4) waveguide overpass crossing in the bottom and the top layers,and Si_(3)N_(4) dual-coupled microring resonators(MRRs)in the middle *** switch is calibration-free and has low insertion *** the 3D microring-based SEs,we implement an 8×8 crossbar optical switch *** the resonance wavelengths of all SEs are well aligned,only one SE needs to be turned on in each routing path,which greatly reduces the complexity of the switch *** optical transmission spectra show a box-like shape,with a passband width of~69 GHz and an average on-state loss of~0.37 *** chip has a record-low on-chip insertion loss of 0.52-2.66 *** also implement a non-duplicate polarization-diversity optical switch by using the bidirectional transmission characteristics of the crossbar architecture,which is highly favorable for practical applications.100 Gb/s dual-polarization quadrature-phase-shift-keying(DP-QPSK)signal is transmitted through the switch without significant *** the best of our knowledge,this is the first time that 3D MRRs have been used to build highly scalable polarization-diversity optical switch fabrics.

关键词： polarization microring optical

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Beam Pattern Modulation Embedded Hybrid Transceiver Optimization for Integrated Sensing and Communication

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IEEE Transactions on Wireless Communications 2025年第6期24卷 4966-4980页

作者： Liu, Boxun Gao, Shijian Yang, Zonghui Cheng, Xiang Yang, Liuqing Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing100871 China Internet of Things Thrust Guangzhou511400 China Internet of Things Thrust Intelligent Transportation Thrust Guangzhou511400 China The Hong Kong University of Science and Technology Department of Electronic and Computer Engineering Department of Civil and Environmental Engineering SAR Hong Kong Hong Kong

Integrated sensing and communication (ISAC) emerges as a promising technology for 6G, particularly in the millimeter-wave (mmWave) band. However, the widely utilized hybrid architecture in mmWave systems compromises multiplexing gain due to the constraints of limited radio-frequency (RF) chains. Moreover, additional sensing functionalities exacerbate the impairment of spectrum efficiency (SE). In this paper, we present an optimized beam pattern modulation-embedded ISAC (BPM-ISAC) transceiver design, which spares one RF chain for sensing and uses the remaining ones for communication. To compensate for the reduced SE, index modulation across communication beams is applied. We formulate an optimization problem aimed at minimizing the mean squared error (MSE) of the sensing beampattern, subject to a symbol MSE constraint. This problem is then solved by sequentially optimizing the analog and digital parts. Both the multi-aperture structure (MAS) and the multi-beam structure (MBS) are considered in the analog part. We conduct theoretical analysis on the asymptotic pairwise error probability (APEP) and the Cramér-Rao bound (CRB) of direction of arrival (DoA) estimation. Numerical simulations validate the overall enhanced ISAC performance over existing alternatives. © 2025 IEEE. All rights reserved.

关键词： Mean square error

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All-optical silicon microring spiking neuron

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Photonics Research 2022年第4期10卷 939-946页

作者： Jinlong Xiang Yujia Zhang Yaotian Zhao Xuhan Guo Yikai Su State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

With the rapid development of artificial intelligence and machine learning, brain-inspired neuromorphic photonics has emerged as an extremely attractive computing paradigm, promising orders-of-magnitude higher computing speed and energy efficiency compared to its electronic counterparts. Tremendous efforts have been devoted to photonic hardware implementations of mimicking the nonlinear neuron-like spiking response and the linear synapse-like weighting functionality. Here, we systematically characterize the spiking dynamics of a passive silicon microring neuron. The research of self-pulsation and excitability reveals that the silicon microring can function as an all-optical class Ⅱ resonate-and-fire neuron. The typical refractory period has been successfully suppressed by configuring the pump power above the perturbation power, hence allowing the microring neuron to operate with a speed up to roughly sub-gigahertz. Additionally, temporal integration and controllable inhibition regimes are experimentally demonstrated for the first time, to the best of our knowledge. Our experimental verification is obtained with a commercial CMOS platform, hence offering great potential for large-scale neuromorphic photonics integration.

关键词： microring optical attractive

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Low temperature sensitivity on-chip Fouriertransform spectrometer based on dual-layer Si_(3)N_(4)spiral waveguides

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Photonics Research 2023年第4期11卷 591-599页

作者： LIANGJUN LU HONGYI ZHANG XIN LI JIANPING CHEN LINJIE ZHOU State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and Location ServicesDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu 314200China

On-chip Fourier-transform spectrometers(FTSs)based on Mach–Zehnder interferometer(MZI)arrays suffer from severe central wavelength and fringe contrast variation due to fabrication *** though a calibration matrix can be employed to correctly retrieve the input spectra,environmental temperature variation greatly degrades the retrieving *** this paper,we devise a dual-layer Si_(3)N_(4) waveguide interferometer to reduce the temperature *** beating of the even and odd supermodes in the dual-layer waveguide generates periodic intensity fluctuations in the *** these two modes have similar modal profiles,their thermal sensitivity and propagation loss are relatively balanced,leading to a low temperature sensitivity and a high interference extinction *** designed and fabricated a passive FTS based on a 32-channel dual-layer Si_(3)N_(4) waveguide *** results show that the temperature sensitivity is reduced to 10 pm/°C,which is almost half that of single-layer Si_(3)N_(4) MZI-based *** this chip,we accurately reconstructed various types of optical spectra,including single and two sparse laser lines,and broadband optical *** method can fit a wide wavelength range,which is a promising technology to improve the practical applications of on-chip FTSs.

关键词： waveguide interferometer layer

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