检索结果-南通市图书馆

Bias-drift-free Mach–Zehnder modulators based on a heterogeneous silicon and lithium niobate platform

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第12期8卷 1958-1963页

作者： SHIHAO SUN MINGBO HE MENGYUE XU SHENGQIAN GAO ZIYAN CHEN XIAN ZHANG ZILIANG RUAN XIONG WU LIDAN ZHOU LIN LIU CHAO LU CHANGJIAN GUO LIU LIU SIYUAN YU XINLUN CAI State key laboratory of optoelectronic Materials and Technologies and School of Electronics and information Technology Sun Yat-sen UniversityGuangzhou 510000China Centre for Optical and Electromagnetic Research Guangdong Provincial Key Laboratory of Optical Information Materials and TechnologySouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityHigher-Education Mega-CenterGuangzhouChina Department of Electronic and information Engineering Photonics Research CentreThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina State key laboratory for Modern Optical instrumentation Centre for Optical and Electromagnetic ResearchZhejiang Provincial Key Laboratory for Sensing TechnologiesZijingang CampusZhejiang UniversityHangzhou 310058China

Optical modulators have been and will continue to be essential devices for energy-and cost-efficient optical communication *** silicon and lithium niobate modulators have demonstrated promising performances of low optical loss,low drive voltage,and large modulation ***,DC bias drift is a major drawback of optical modulators using lithium niobate as the active electro-optic ***,we demonstrate high-speed and bias-drift-free Mach–Zehnder modulators based on the heterogeneous silicon and lithium niobate *** devices combine stable thermo-optic DC biases in silicon and ultra-fast electro-optic modulation in lithium niobate,and exhibit a low insertion loss of 1.8 d B,a low half-wave voltage of 3 V,an electro-optic modulation bandwidth of at least 70 GHz,and modulation data rates up to 128 Gb/s.

关键词： modulators lithium niobate

Improving iconic memory through contrast detection training with HOA-corrected vision

在线全文

学校读者我要写书评

暂无评论

Fundamental Research 2024年第1期4卷 95-102页

作者： Ling Gong Junlei Zhao Yun Dai Zili Wang Fang Hou Yudong Zhang Zhong-Lin Lu Jiawei Zhou State key laboratory of Ophthalmology Optometry and Vision ScienceEye HospitalSchool of Ophthalmology and OptometryWenzhou Medical UniversityWenzhou 325027China Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China The key laboratory of Adaptive Optics Chinese Academy of SciencesChengdu 610209China Chengdu University of Traditional Chinese Medicine Chengdu 610075China Division of Arts and Sciences New York University ShanghaiShanghai 200126China Center for Neural Science Department of PsychologyNew York UniversityNew York 10003United States NYU-ECNU Institute of Brain and Cognitive Science at NYU Shanghai Shanghai 200062China

Iconic memory and short-term memory are not only crucial for perception and cognition,but also of great importance to mental ***,we first showed that both types of memory could be improved by improving limiting processes in visual processing through perceptual *** adults were trained in a contrast detection task for ten days,with their higher-order aberrations(HOA)corrected in *** found that the training improved not only their contrast sensitivity function(CSF),but also their iconic memory and baseline information maintenance for short-term memory,and the relationship between memory and CSF improvements could be well-predicted by an observer *** results suggest that training the limiting component of a cognitive task with visual perceptual learning could improve visual *** may also provide an empirical foundation for new therapies to treat people with poor sensory memory.

关键词： Perceptual learning Iconic memory Higher-order aberrations Contrast sensitivity Short-term memory

Research on Artificial Lateral Line perception of Flow Field based on Pressure Difference Matrix

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2019年第6期16卷 1007-1018页

作者： Guijie Liu Shuikuan Liu Shirui Wang Huanhuan Hao Mengmeng Wang key laboratory of Ocean Engineering of Shandong province Ocean University of ChinaQingdao 266100China

In nature,with the help of lateral lines,fish is capable of sensing the state of the flow field and recognizing the surrounding near-fleld hydrodynamic environment in the condition of weak light or even complete *** order to study the application of lateral lines,an improved pressure distribution model was proposed in this paper,and the pressure distributions of the lateral line carrier under different working conditions were obtained using hydrodynamic ***,a visualized pressure difference matrix was constructed to identify the flow fields under different working *** role of the lateral lines was investigated from a visual image *** features of different flow velocities,flow angles and obstacle offset distances were mapped into the pressure difference ***,a four-layer Convolutional Neural Network(CNN)model was built as a recognition tool to evaluate the effectiveness of the pressure difference matrix *** recognition results demonstrate that the CNN can identify the flow field state with 2 s earlier than the current ***,the proposed method provides a new way to identify flow field information in engineering applications.

关键词： artificial lateral line system bioinspiration pressure difference matrix convolutional neural network flow field visualization

Single-channel vector magnetic information detection method based on diamond NV color center

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第8期30卷 275-281页

作者： Qin-Qin Wang Rui-Rong Wang Jin-Ping Liu Shao-Zhuo Lin Liang-Wei Wu Hao Guo Zhong-Hao Li Huan-Fei Wen Jun Tang Zong-Min Ma Jun Liu key laboratory of instrumentation Science and Dynamic Measurement School of Instrument and ElectronicsNorth University of ChinaTaiyuan 030051China

A method of detecting the single channel triaxial magnetic field information based on diamond nitrogen-vacancy(NV)color center is ***,the incident angle of the bias magnetic field which can achieve the equal frequency difference optically-detected magnetic resonance(ODMR)spectrum of diamond NV color center is calculated theoretically,and the triaxial magnetic information solution model is also ***,the microwave time-controlled circuit module is designed to generate equal timing and equal frequency difference microwave pulse signals in one *** with the optical detection magnetic resonance technology,the purpose of sequentially locking and detecting the four formant signals on one side of the diamond NV color center(m_(s)=-1 state signal)is achieved,and the vector magnetic field information detection is accomplished by combining the triaxial magnetic information solution *** system can obtain magnetic field detection in a range of 0 mT-0.82 *** system's magnetic noise sensitivity is 14.2 nT/Hz^(1/2),and the deviation angle errors of magnetic field detectionθ_(x) andθ_(y) are 1.3° and 8.2° respectively.

关键词： nitrogen-vacancy(NV)color center vector electron spin magnetic detection

Asymmetrical Fabry-Perot cavity slot micro-ring resonator and its sensing characteristics

在线全文

学校读者我要写书评

暂无评论

Journal of Measurement Science and instrumentation 2024年第3期15卷 292-301页

作者： CAO Qianqian LIU Chunjuan WU Xiaosuo SUN Xiaoli School of Electronic and information Engineering Lanzhou Jiaotong UniversityLanzhou 730070China

To achieve high quality factor and high-sensitivity refractive index sensor,a slot micro-ring resonator(MRR)based on asymmetric Fabry-Perot(FP)cavity was *** structure consisted of a pair of elliptical holes to form an FP cavity and a microring *** two different optical modes generated by the micro-ring resonator were destructively interfered to form a Fano line shape,which improved the system sensitivity while obtaining a higher quality factor and extinction *** transmission principle of the structure was analyzed by the transfer matrix *** transmission spectrum and mode field distribution of the proposed structure were simulated by the finite difference time domain(FDTD)method,and the key structural parameters affecting the Fano line shape in the device were *** simulation results show that the quality factor of the device reached 22037.1,and the extinction ratio was 23.9 *** analyzing the refractive index sensing characteristics,the sensitivity of the structure was 354 nm·RIU−1,and the detection limit of the sensitivity was 2×10−4 ***,the proposed compact asymmetric FP cavity slot micro-ring resonator has obvious advantages in sensing applications owing to its excellent performance.

关键词： micro-ring resonator(MRR) Fabry-Perot(FP)cavity Fano resonance refractive index sensing integrated optics silicon waveguide

Magnon squeezing enhanced ground-state cooling in cavity magnomechanics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fundamental Research 2023年第1期3卷 3-7页

作者： M.Asjad Jie Li Shi-Yao Zhu J.Q.You Department of Applied Mathematics and Sciences Khalifa UniversityAbu Dhabi 127788United Arab Emirates Interdisciplinary Center of Quantum information State Key Laboratory of Modern Optical Instrumentationand Zhejiang Province Key Laboratory of Quantum Technology and DeviceDepartment of PhysicsZhejiang UniversityHangzhou 310027China

Cavity magnomechanics has recently become a new platform for studying macroscopic quantum *** magnetostriction induced vibration mode of a large-size ferromagnet or ferrimagnet reaching its ground state represents a genuine macroscopic quantum *** we study the ground-state cooling of the mechanical vibration mode in a cavity magnomechanical system,and focus on the role of magnon squeezing in improving the cooling *** magnon squeezing is obtained by exploiting the magnon self-Kerr *** find that the magnon squeezing can significantly and even completely suppress the magnomechanical Stokes *** thus becomes particularly useful in realizing ground-state cooling in the unresolved-sideband regime,where the conventional sideband cooling protocols become *** also find that the coupling to the microwave cavity plays only an adverse effect in mechanical *** makes essentially the two-mode magnomechanical system(without involving the microwave cavity)a preferred system for cooling the mechanical motion,in which the magnon mode is established by a uniform bias magnetic field and a microwave drive field.

关键词： Cavity magnomechanics Ground-state cooling Magnetostriction Optomechanics Dispersive coupling

Prototype-based classifier learning for long-tailed visual recognition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(information Sciences) 2022年第6期65卷 62-76页

作者： Xiu-Shen WEI Shu-Lin XU Hao CHEN Liang XIAO Yuxin PENG School of Computer Science and Engineering Nanjing University of Science and Technology key Lab of Intelligent perception and Systems for High-Dimensional information of Ministry of Education and Jiangsu Key Lab of Image and Video Understanding for Social Security Wangxuan Institute of Computer Technology Peking University State key laboratory of Integrated Services Networks Xidian University

In this paper, we tackle the long-tailed visual recognition problem from the categorical prototype perspective by proposing a prototype-based classifier learning(PCL) method. Specifically, thanks to the generalization ability and robustness, categorical prototypes reveal their advantages of representing the category semantics. Coupled with their class-balance characteristic, categorical prototypes also show potential for handling data imbalance. In our PCL, we propose to generate the categorical classifiers based on the prototypes by performing a learnable mapping function. To further alleviate the impact of imbalance on classifier generation, two kinds of classifier calibration approaches are designed from both prototype-level and example-level aspects. Extensive experiments on five benchmark datasets, including the large-scale iNaturalist, Places-LT,and ImageNet-LT, justify that the proposed PCL can outperform state-of-the-arts. Furthermore, validation experiments can demonstrate the effectiveness of tailored designs in PCL for long-tailed problems.

关键词： long-tailed distribution categorical prototype classifier generation classifier calibration class imbalance

MIMO Scheduling Effectiveness Analysis for Bursty Data Service from View of QoE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2017年第5期26卷 1079-1085页

作者： CHEN Lei JIANG Dingde BAO Rong XIONG Jiping LIU Fuqiang BEI Lulu Jiangsu province key laboratory of Intelligent Industry Control Technology Xuzhou University of Technology School of Computer Science and Engineering Northeastern University College of Mathematics Physics and Information EngineeringZhejiang Normal University College of Electronics and information Engineering Tongji University

In the user selection phrase of the conventional Multiple-input-multiple-output(MIMO) scheduling schemes,the frequent user exchange deteriorates the Quality of user experience(Qo E) of the bursty data *** the channel vector orthogonalization computation results in a high time *** address these problems,we propose an inertial scheduling policy to reduce the number of noneffective user exchange,and substitute self-organization policy for channel vector orthogonalization computation to reduce computational *** relationship between the scheduling effectiveness and the inertia of objective function is observed in the *** simulation results show that the inertial scheduling policy effectively reduce the number of potential noneffective scheduling which is inversely proportional to the Mean opinion score(MOS)that quantifies the Qo *** proposed scheduling scheme provides significant improvement in Qo E performance in the *** the proposed scheduling scheme does not consider the channel vector orthogonalization in the user selection phrase,its throughput approaches the level of the throughput-oriented scheme because of its selforganization scheduling policy.

关键词： Bursty data service Multiple-inputmultiple-output(MIMO) Quality of user experience(QoE) Time perception

Passive devices at 2 μm wavelength on 200 mm CMOS-compatible silicon photonics platform [Invited]

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2021年第7期19卷 22-26页

作者： Hui Ma Haotian Yang Bo Tang Maoliang Wei Junying Li Jianghong Wu Peng Zhang Chunlei Sun Lan Li Hongtao Lin State key laboratory of Modern Optical instrumentation College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310007China Institute of Microelectronics Chinese Academic SocietyBeijing 100029China key laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang province School of EngineeringWestlake UniversityHangzhou 310007China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310023China

As a promising spectral window for optical communication and sensing, it is of great significance to realize on-chip devices at the 2 μm *** development of the 2 μm silicon photonic platform mainly depends on the performance of passive *** this work, the passive devices were fabricated in the silicon photonic multi-project wafer *** designed micro-ring resonator with a 0.6 μm wide silicon ridge waveguide based on a 220 nm silicon-on-insulator platform achieves a high intrinsic quality factor of 3.0 × *** propagation loss is calculated as 1.62 d B/*** addition,the waveguide crossing, multimode interferometer, and Mach–Zehnder interferometer were demonstrated at 2 μm with good performances.

关键词： silicon photonics integrated photonics grating coupler multimode interferometer waveguide crossing