检索结果-南通市图书馆

同方期刊数据库

Scalable parallel ultrafast optical random bit generation based on a single chaotic microcomb

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第4期13卷 637-644页

作者： Pu Li Qizhi Li Wenye Tang Weiqiang Wang Wenfu Zhang brent elittle Sai Tek Chu KAlan Shore Yuwen Qin Yuncai Wang Institute of Advanced Photonics Technology School of Information EngineeringGuangdong University of TechnologyGuangzhou 51006China. Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of ChinaGuangdong University of TechnologyGuangzhou 51006China. Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of TechnologyGuangzhou 51006China. Key Laboratory of Advanced Transducers andIntelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China. State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China. Department of Physics and Materials Science City University of Hong KongHong KongChina. School of Electronic Engineering Bangor UniversityBangorWales LL571UTUK

Random bit generators are critical for information security,cryptography,stochastic modeling,and *** and scalability are key challenges faced by current physical random bit ***,we propose a massively parallel scheme for ultrafast random bit generation towards rates of order 100 terabit per second based on a single micro-ring resonator.A modulation-instability-driven chaotic comb in a micro-ring resonator enables the simultaneous generation of hundreds of independent and unbiased random bit streams.A proof-of-concept experiment demonstrates that using our method,random bit streams beyond 2 terabit per second can be successfully generated with only 7 comb *** bit rate can be easily enhanced by further increasing the number of comb lines *** approach provides a chip-scale solution to random bit generation for secure communication and high-performance computation,and offers superhigh speed and large scalability.

关键词： resonator random chaotic

CMOS-compatible high-index doped silica waveguide with an embedded silicon-nanocrystal strip for all-optical analog-to-digital conversion

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2019年第10期7卷 1200-1208页

作者： YUHUA LI KUN ZHU ZHE KANG WAI LOK HO ROY DAVIDSON CHAO LU brent elittle SAI TAK CHU Department of Physics City University of Hong KongHong KongChina Photonics Research Centre Department of Electronic and Information EngineeringThe Hong Kong Polytechnic UniversityHong KongChina QXP Technology Inc. Xi’an 710119China State Key Laboratory of Transient Optics and Photonics XIOPMCASXi’an 710119China

Passive all-optical signal processors that overcome the electronic bottleneck can potentially be the enabling components for the next-generation high-speed and lower power consumption systems. Here, we propose and experimentally demonstrate a CMOS-compatible waveguide and its application to the all-optical analog-to-digital converter(ADC) under the nonlinear spectral splitting and filtering scheme. As the key component of the proposed ADC, a 50 cm long high-index doped silica glass spiral waveguide is composed of a thin silicon-nanocrystal(Si-nc) layer embedded in the core center for enhanced nonlinearity. The device simultaneously possesses low loss(0.16 dB/cm at 1550 nm), large nonlinearity(305 W^-1∕km at 1550 nm), and negligible nonlinear absorption.A 2-bit ADC basic unit is achieved when pumped by the proposed waveguide structure at the telecom band and without any additional amplification. Simulation results that are consistent with the experimental ones are also demonstrated, which further confirm the feasibility of the proposed scheme for larger quantization *** demonstrated approach enables a fully monolithic solution for all-optical ADC in the future, which can digitize broadband optical signals directly at low power consumption. This has great potential on the applications of high-speed optical communications, networks, and signal processing systems.

关键词： waveguide optical pumped

Program-controlled single soliton microcomb source

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2021年第1期9卷 66-72页

作者： XINYU WANG PENG XIE WEIQIANG WANG YANG WANG ZHIZHOU LU LEIRAN WANG SAI TCHU brent elittle WEI ZHAO WENFU ZHANG State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision Mechanics(XIOPM)Chinese Academy of Sciences(CAS)Xi’an 710119China University of Chinese Academy of Sciences Beijing 100049China Department of Physics and Materials Science City University of Hong KongHong KongChina

Soliton microcombs(SMCs)are spontaneously formed in a coherently pumped high-quality microresonator,which provides a new tool for use as an on-chip frequency comb for applications of high-precision metrology and ***,generation of SMCs seriously relies on advanced experimental techniques from professional ***,we experimentally demonstrate a program-controlled single SMC source where the intracavity thermal effect is timely balanced using an auxiliary laser during single SMC *** microcomb power is adopted as the criteria for microcomb states discrimination and a forward and backward thermal tuning technique is employed for the deterministic single SMC ***,based on a closed-loop control system,the repetition rate stability of the SMC source improved more than 20 times and the pump frequency can be continuously tuned by simply changing the operation *** reliability of the SMC source is verified by consecutive 200 generation trials and maintaining over 10 *** believe the proposed SMC source will have significant promising influences in future SMC-based application development.

关键词： tuning pumped pump

Athermal third harmonic generation in micro‐ring resonators

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2020年第12期3卷 17-27页

作者： Shaohao Wang Yuhua Li brent elittle Leiran Wang Xiang Wang Roy RDavidson Sai Tak Chu FZU-Jinjiang Joint Institute of Microelectronics Jinjiang Science and Education ParkFuzhou UniversityJinjiang 362200China Department of Physics City University of Hong KongKowloon TongHong Kong 999077China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China QXP Technology Xi’an 710311China Department of Microelectronics Science and Technology Qi Shan CampusFuzhou UniversityFuzhou 350108China Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China

Nonlinear high-harmonic generation in micro-resonators is a common technique used to extend the operating range of applications such as self-referencing systems and coherent communications in the visible ***,the generated high-harmonic emissions are subject to a resonance shift with a change in *** present a comprehensive study of the thermal behavior induced phase mismatch that shows this resonance shift can be compensated by a combination of the linear and nonlinear thermo-optics *** this model,we predict and experimentally demonstrate visible third harmonic modes having temperature dependent wavelength shifts between−2.84 pm/ºC and 2.35 pm/ºC when pumped at the *** providing a new way to achieve athermal operation,this also allows one to measure the thermal coefficients and Q-factor of the visible *** steady state analysis,we have also identified the existence of stable athermal third harmonic generation and experimentally demonstrated orthogonally pumped visible third harmonic modes with a temperature dependent wavelength shift of 0.05 pm/ºC over a temperature range of 12º*** findings promise a configurable and active temperature dependent wavelength shift compensation scheme for highly efficient and precise visible emission generation for potential 2f–3f self-referencing in metrology,biological and chemical sensing applications.

关键词： third-harmonic generation thermodynamics micro-resonators

Hyperbolic resonant radiation of concomitant microcombs induced by cross-phase modulation

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2023年第6期11卷 1075-1084页

作者： YANG WANG WEIQIANG WANG ZHIZHOU LU XINYU WANG LONG HUANG brent elittle SAI TCHU WEI ZHAO WENFU ZHANG State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China Chongqing United Microelectronics Center(CUMEC) Chongqing 401332China Department of Physics and Materials Science City University of Hong KongHong KongChina

A high-quality optical microcavity can enhance optical nonlinear effects by resonant recirculation,which provides a reliable platform for nonlinear optics *** a soliton microcomb and a probe optical field are coexisting in a micro-resonator,a concomitant microcomb(CMC)induced by cross-phase modulation(XPM)will be formed ***,we characterize the CMC comprehensively in a micro-resonator through theory,numerical simulation,and experimental *** is found that the CMCs spectra are modulated due to resonant radiation(RR)resulting from the interaction of dispersion and XPM *** group velocity dispersion induces symmetric RRs on the CMC,which leads to a symmetric spectral envelope and a dual-peak pulse in frequency and temporal domains,respectively,while the group velocity mismatch breaks the symmetry of RRs and leads to asymmetric spectral and temporal *** the group velocity is linearly varying with frequency,two RR frequencies are hyperbolically distributed about the pump,and the probe light acts as one of the asymptotic *** results enrich the CMC dynamics and guide microcomb design and applications such as spectral extension and dark pulse generation.

关键词： resonant symmetric dispersion

Atom-referenced and stabilized soliton microcomb

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 2-8页

作者： Rui Niu Shuai Wan Tian-Peng Hua Wei-Qiang Wang Zheng-Yu Wang Jin Li Zhu-Bo Wang Ming Li Zhen Shen Yu Robert Sun Shui-Ming Hu brent elittle Sai Tak Chu Wei Zhao Guang-Can Guo Chang-Ling Zou Yun-Feng Xiao Wen-Fu Zhang Chun-Hua Dong State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China University of Chinese Academy of Sciences Beijing 100049China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Department of Physics and Materials Science City University of Hong KongHong Kong 999077China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

For the applications of the frequency comb in microresonators,it is essential to obtain a fully frequency-stabilized microcomb laser *** this study,we present a system for generating a fully atom-referenced stabilized soliton *** pump light around 1560.48 nm is locked to an ultra-low-expansion(ULE)*** pump light is then frequency-doubled and referenced to the atomic transition *** repetition rate of the soliton microcomb is injection-locked to an atomic-clockstabilized radio frequency(RF)source,leading to mHz stabilization at 1 *** a result,all comb lines have been frequencystabilized based on the atomic reference and the ULE cavity,achieving a very high precision of approximately 18 Hz at 1 s,corresponding to the frequency stability of 9.5×10^(-14).Our approach provides a fully stabilized microcomb experiment scheme with no requirement of f-2f technique,which could be easily implemented and generalized to various photonic platforms,thus paving the way towards the ultraprecise optical sources for high precision spectroscopy.

关键词： microcavity frequency comb dissipative Kerr solitons fully stabilized microcomb

同方期刊数据库

Terabit FSO communication based on a soliton microcomb

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2022年第12期10卷 2802-2808页

作者： WEN SHAO YANG WANG SHUAIWEI JIA ZHUANG XIE DUORUI GAO WEI WANG DONGQUAN ZHANG PELXUAN LIAO brent elittle SAI TCHU WEI ZHAO WENFU ZHANG WEIQIANG WANG XIAOPING XIE State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision Mechanics(XIOPM)Chinese Academy of SciencesXi'an 710119China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Department of Physics and Materials Science City University of Hong KongHong KongChina

Free-space optical(FSO)communication technology is a promising approach to establish a secure wireless link,which has the advantages of excellent directionality,large bandwidth,multiple services,low mass and less power requirements,and easy and fast *** the communication capacity is the perennial goal in both scientific and engineer *** this paper,we experimentally demonstrate a Tbit/s parallel FSO communication system using a soliton microcomb as a multiple wavelength laser *** communication terminals are installed in two buildings with a straight-line distance of~1 km.102 comb lines are modulated by10 Gbit/s differential phase-shift keying signals and demodulated using a delay-line *** the transmitted optical power is amplified to 19.8 dBm,42 optical channels have optical signal-to-noise ratios higher than 27 dB and bit error rates less than 1×10^(-9).Our experiment shows the feasibility of a wavelength-division multiplexing FSO communication system which suits the ultra-high-speed wireless transmission application scenarios in future satellite-based communications,disaster recovery,defense,last mile problems in networks and remote sensing,and so on.

关键词： communication FSO interferometer

LiDAR mapping of ground damage in a heading re-orientation case study

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2021年第1期31卷 67-74页

作者： Nicole Evanek brent Slaker Anthony Iannacchione Tim Miller National Institute for Occupational Safety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA University of Pittsburgh PittsburghPA 15260USA East Fairfield Coal Company North LimaOH 44452USA

The Subtropolis Mine is a room-and-pillar mine extracting the Vanport limestone near Petersburg,Ohio,*** February of 2018,mine management began implementing a heading re-orientation to better control the negative effects of excessive levels of horizontal *** conditions in the headings improved,but as expected,stress-related damage concentrated within *** mine operator has worked to lessen the impact of the instabilities in the outby crosscuts by implementing several engineering *** the implementation of each control,conditions were monitored and analyzed using observational and measurement techniques including 3D LiDAR *** the heading re-orientation,several 3D LiDAR surveys have been conducted and analyzed by researchers from the National Institute for Occupational Safety and Health(NIOSH).This study examines(1)the characteristics of each 3D LiDAR survey,(2)the change in the detailed strata conditions in response to stress concentrations,and(3)the change detection techniques between 3D LiDAR surveys to assess entry ***,the 3D LiDAR surveys proved to be a useful tool for characterizing ground instability and assessing the effectiveness of the engineering controls used in the heading re-orientation at the Subtropolis Mine.

关键词： Ground control Limestone Horizontal stress Stress control layout Crosscut Windows

A practical application of photogrammetry to performing rib characterization measurements in an underground coal mine using a DSLR camera

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2017年第1期27卷 83-90页

作者： brent A.Slaker Khaled M.Mohamed Mining Engineer Ground Control Branch NIOSH Office of Mine Safety and Health ResearchPittsburghPAUSA

Understanding coal mine rib behavior is important for inferring pillar loading conditions as well as ensuring the safety of miners who are regularly exposed to ribs. Due to the variability in the geometry of underground openings and ground behavior, point measurements often fail to capture the true movement of mine workings. Photogrammetry is a potentially fast, cheap, and precise supplemental measurement tool in comparison to extensometers, tape measures, or laser range meters, but its application in underground coal has been limited. The practical use of photogrammetry was tested at the Safety Research Coal Mine, National Institute for Occupational Safety and Health(NIOSH). A commercially available, digital single-lens reflex(DSLR) camera was used to perform the photogrammetric surveys for the experiment. Several experiments were performed using different lighting conditions, distances to subject,camera settings, and photograph overlaps, with results summarized as follows: the lighting method was found to be insignificant if the scene was appropriately illuminated. It was found that the distance to the subject has a minimal impact on result accuracy, and that camera settings have a significant impact on the photogrammetric quality of images. An increasing photograph resolution was preferable when measuring plane orientations; otherwise a high point cloud density would likely be excessive. Focal ratio(F-stop) changes affect the depth of field and image quality in situations where multiple angles are necessary to survey cleat orientations. Photograph overlap is very important to proper three-dimensional reconstruction, and at least 60% overlap between photograph pairs is ideal to avoid unnecessary post-processing. The suggestions and guidelines proposed are designed to increase the quality of photogrammetry inputs and outputs as well as minimize processing time, and serve as a starting point for an underground coal photogrammetry study.

关键词： Photogrammetry Coal mining Underground Rib characterization