检索结果-南通市图书馆

Photonic integration on rare earth ion-doped thin-film lithium niobate

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 157-158页

作者： Yuping Chen state key laboratory of advanced optical communication systems and networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China

The modulation bandwidth of silicon-based photonics is limited to approximately 60 GHz because of the maximum carrier mobility,which limits its development in high-capacity and high-speed information *** niobate has r... 详细信息

关键词： niobate lithium film

Silicon-based optoelectronics for general-purpose matrix computation:a review

在线全文

学校读者我要写书评

暂无评论

advanced Photonics 2022年第4期4卷 1-13页

作者： Pengfei Xu Zhiping Zhou Peking University State Key Laboratory of Advanced Optical Communication Systems and NetworksSchool of ElectronicsBeijingChina Chinese Academy of Sciences Shanghai Institute of Optics and Fine MechanicsShanghaiChina

Conventional electronic processors,which are the mainstream and almost invincible hardware for computation,are approaching their limits in both computational power and energy efficiency,especially in large-scale matrix *** combining electronic,photonic,and optoelectronic devices and circuits together,silicon-based optoelectronic matrix computation has been demonstrating great capabilities and *** computation is one of the few general-purpose computations that have the potential to exceed the computation performance of digital logic circuits in energy efficiency,computational power,and ***,electronic processors also suffer from the tremendous energy consumption of the digital transceiver circuits during high-capacity data *** review the recent progress in photonic matrix computation,including matrix-vector multiplication,convolution,and multiply–accumulate operations in artificial neural networks,quantum information processing,combinatorial optimization,and compressed sensing,with particular attention paid to energy *** also summarize the advantages of siliconbased optoelectronic matrix computation in data interconnections and photonic-electronic integration over conventional optical computing *** toward the future of silicon-based optoelectronic matrix computations,we believe that silicon-based optoelectronics is a promising and comprehensive platform for disruptively improving general-purpose matrix computation performance in the post-Moore’s law era.

关键词： silicon-based optoelectronics photonic matrix computation optical interconnections photonic-electronic integration

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

在线全文

学校读者我要写书评

暂无评论

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

Comb-based photonic neural population for parallel and nonlinear processing

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2022年第1期10卷 174-182页

作者： BOWEN MA JUNFENG ZHANG WEIWEN ZOU state key laboratory of advanced optical communication systems and networks Intelligent Microwave Lightwave Integration Innovation Center(imLic)Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

It is believed that neural information representation and processing relies on the neural population instead of a single *** neuromorphic photonics,photonic neurons in the form of nonlinear responses have been extensively studied in single devices and temporal ***,to construct a photonic neural population(PNP),the process of scaling up and massive interconnections remain challenging considering the physical complexity and response ***,we propose a comb-based PNP interconnected by carrier coupling with superior *** unique properties of neural population are theoretically and experimentally demonstrated in the comb-based PNP,including nonlinear response curves and population activities coding.A classification task of three input patterns with dual radio-frequency(RF) tones is successfully implemented in a time-efficient manner,which allows the comb-based PNP to make effective use of the ultra-broad bandwidth of photonics for parallel and nonlinear processing.

关键词： nonlinear scaling neural

Integrated terahertz vortex beam emitter for rotating target detection

在线全文

学校读者我要写书评

暂无评论

advanced Photonics 2023年第6期5卷 37-46页

作者： Jingya Xie Jun Qian Tengjiao Wang Linjie Zhou Xiaofei Zang Lin Chen Yiming Zhu Songlin Zhuang University of Shanghai for Science and Technology Terahertz Technology Innovation Research InstituteShanghai Key Laboratory of Modern Optical SystemShanghaiChina Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronic EngineeringShanghaiChina

We propose a terahertz(THz)vortex emitter that utilizes a high-resistance silicon resonator to generate vortex beams with various topological *** the challenge of double circular polarization superposition resulting from the high refractive index contrast,we regulate the transverse spin state through a newly designed second-order grating partially etched on the waveguide’s top *** reflected wave can be received directly by a linearly polarized antenna,simplifying the *** from the tuning feature,a joint detection method involving positive and negative topological charges identifies and detects rotational Doppler effects amid robust micro-Doppler interference *** emitter can be used for the rotational velocity measurement of an on-axis spinning object,achieving an impressive maximum speed error rate of∼2%.This approach holds promise for the future development of THz vortex beam applications in radar target detection and countermeasure systems,given its low cost and potential for mass production.

关键词： vortex beam emitter terahertz rotational Doppler detection

Continuous-variable quantum key distribution with on-chip light sources

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2023年第4期11卷 504-516页

作者： LANG LI TAO WANG XINHANG LI PENG HUANG YUYAO GUO LIANGJUN LU LINJIE ZHOU GUIHUA ZENG state key laboratory of advanced optical communication systems and networks Center for Quantum Sensing and Information ProcessingDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China 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

Integrated quantum key distribution(QKD)systems based on photonic chips have high scalability and stability,and are promising for further construction of global quantum communications ***-chip quantum light sources are a critical component of a fully integrated QKD system;especially a continuous-variable QKD(CVQKD)system based on coherent detection,which has extremely high requirements for the light ***,for what we believe is the first time,we designed and fabricated two on-chip tunable lasers for CV-QKD,and demonstrated a high-performance system based on these *** of the high output power,fine tunability,and narrow linewidth,the involved on-chip lasers guarantee the accurate shot-noise-limited detection of quantum signals,center wavelength alignment of nonhomologous lasers,and suppression of untrusted excess *** system’s secret key rate can reach 0.75 Mb/s at a 50 km fiber distance,and the secure transmission distance can exceed 100 *** results mark a breakthrough toward building a fully integrated CV-QKD,and pave the way for a reliable and efficient terrestrial quantum-secure metropolitan area network.

关键词： quantum sources distribution

Monolithic thin film lithium niobate electro-optic modulator with over 110 GHz bandwidth

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2022年第2期20卷 148-152页

作者：杨帆方先松陈心羽朱立新张帆陈章渊李艳萍 state key laboratory of advanced optical communication systems and networks Department of ElectronicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China

High-performance thin film lithium niobate(LN) electro-optic modulators with low cost are in demand. Based on photolithography and wet etching, we experimentally demonstrate a thin film LN Mach–Zehnder modulator with a 3 d B bandwidth exceeding 110 GHz, which shows the potential of boosting the throughput and reducing cost. The fabricated modulator also exhibits a comparable low half-wave voltage-length product of ~2.37 V · cm, a high extinction ratio of >23 d B, and the propagation loss of optical waveguides of ~0.2 d B/cm. Besides, six-level pulse amplitude modulation up to 250 Gb/s is successfully achieved.

关键词： lithium niobate electro-optic modulator high bandwidth photolithography wet etching

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

在线全文

学校读者我要写书评

暂无评论

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

Accurate and broadband manipulations of harmonic amplitudes and phases to reach 256 QAM millimeter-wave wireless communications by time-domain digital coding metasurface

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第1期9卷 36-46页

作者： Ming Zheng Chen Wankai Tang Jun Yan Dai Jun Chen Ke Lei Zhang Cheng Zhang Jin Yang Lianlin Li Qiang Cheng Shi Jin Tie Jun Cui Institute of Electromagnetic Space Southeast University state key laboratory of Terahertz and Millimeter Waves City University of Hong Kong state key laboratory of advanced optical communication systems and networks Department of Electronics Peking University National Mobile communications Research laboratory Southeast University state key laboratory of Millimeter Waves Southeast University Center of Intelligent Metamaterials Pazhou Laboratory

We propose a theoretical mechanism and new coding strategy to realize extremely accurate manipulations of nonlinear electromagnetic harmonics in ultrawide frequency band based on a time-domain digital coding metasurface(TDCM).Using the proposed mechanism and coding strategy,we design and fabricate a millimeter-wave(mmWave) TDCM,which is composed of reprogrammable meta-atoms embedded with positive-intrinsic-negative *** controlling the duty ratios and time delays of the digital coding sequences loaded on a TDCM,experimental results show that both amplitudes and phases of different harmonics can be engineered at will simultaneously and precisely in broad frequency band from 22 to33 GHz,even when the coding states are imperfect,which is in good agreement with theoretical *** on the fabricated high-performance TDCM,we further propose and experimentally realize a large-capacity mmWave wireless communication system,where 256 quadrature amplitude modulation,along with other schemes,is *** new wireless communication system has a much simpler architecture than the currently used mmWave wireless systems,and hence can significantly reduce the hardware *** believe that the proposed method and system architecture can find vast application in future mmWave and terahertz-wave wireless communication and radar systems.

关键词： metasurface time-domain digital coding accurate and broadband harmonic control 256 QAM millimeter-wave wireless communications