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Atom-referenced and stabilized soliton microcomb

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 source.In this study,we present a system for generating a fully atom-referenced stabilized soliton microcomb.The pump light around 1560.48 nm is locked to an ultra-low-expansion(ULE)cavity.This pump light is then frequency-doubled and referenced to the atomic transition of87Rb.The repetition rate of the soliton microcomb is injection-locked to an atomic-clockstabilized radio frequency(RF)source,leading to mHz stabilization at 1 s.As 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

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

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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 simulations.Speed and scalability are key challenges faced by current physical random bit generation.Herein,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 lines.This bit rate can be easily enhanced by further increasing the number of comb lines used.Our 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

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Four-wave mixing in silicon-nanocrystal embedded high-index doped silica micro-ring resonator

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Journal of Semiconductors 2021年第4期42卷 104-110页

作者： Yuhua Li Xiang Wang Roy Davidson Brent E.Little sai tak chu Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics City University of Hong KongHong Kong 999077China QXP Technology Inc. Xi’an 710119China State Key Laboratory of Transient Optics and Photonics XIOPMCASXi’an 710119China

A nonlinear integrated optical platform that allows the fabrication of waveguide circuits with different material composition,and at small dimensions,offers advantages in terms of field enhancement and increased interaction length,thereby facilitating the observation of nonlinear optics effects at a much lower power level.To enhance the nonlinearity of the conventional waveguide structure,in this work,we propose and demonstrate a microstructured waveguide where silicon rich layer is embedded in the core of the conventional waveguide in order to increase its nonlinearity.By embedding a 20 nm thin film of silicon nanocrystal(Si-nc),we achieve a twofold increase of the nonlinear parameter,γ.The linear relationship between the fourwave mixing conversion efficiency and pump power reveals the negligible nonlinear absorption and small dispersion in the micro-ring resonators.This simple approach of embedding an ultra-thin Si-nc layer into conventional high-index doped silica dramatically increases its nonlinear performance,and could potentially find applications in all-optical processing functions.

关键词： four-wave mixing silicon nanocrystal high-index doped silica micro-ring resonator

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Athermal third harmonic generation in micro‐ring resonators

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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 region.However,the generated high-harmonic emissions are subject to a resonance shift with a change in temperature.We 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 effects.Using 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 L-band.Besides providing a new way to achieve athermal operation,this also allows one to measure the thermal coefficients and Q-factor of the visible modes.Through 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 12ºC.Our 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

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

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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 resolution.This 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

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基于疲劳可靠度的钢桥面板限载取值

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交通运输工程学报 2024年第1期24卷 245-256页

作者：翟慕赛钱佳宸褚乐陶怡然苏州科技大学土木工程学院江苏苏州215011

为确定钢桥面板限载的合理取值,建立钢桥面板多尺度有限元模型,利用动态称重(WIM)和Monte Carlo方法生成随机车流样本并进行有限元模型动态加载,通过雨流计数法获取钢桥面板随机疲劳应力谱,基于可靠度理论和疲劳累积损伤理论计算钢桥面... 详细信息

为确定钢桥面板限载的合理取值,建立钢桥面板多尺度有限元模型,利用动态称重(WIM)和Monte Carlo方法生成随机车流样本并进行有限元模型动态加载,通过雨流计数法获取钢桥面板随机疲劳应力谱,基于可靠度理论和疲劳累积损伤理论计算钢桥面板典型细节疲劳可靠度,提出基于疲劳可靠度的钢桥面板限载取值方法;以某跨海斜拉桥钢桥面板为例,基于连续12个月的WIM数据,分别对钢桥面板典型细节进行疲劳可靠性评估,考虑交通量和荷载水平的线性年增长系数,确定了不同交通状况下钢桥面板的限载取值。研究结果表明:当前交通状况下钢桥面板疲劳可靠度指标均高于目标疲劳可靠度指标;交通量和荷载水平对钢桥面板疲劳可靠度指标影响较大,考虑交通量线性年增长系数为2.0%或荷载线性年增长系数为0.4%时,钢桥面板部分细节在设计使用年限内疲劳可靠度指标低于目标疲劳可靠度指标;考虑交通量线性年增长系数为3.0%且荷载线性年增长系数为0.6%时,当前49.0 t限载条件下细节疲劳可靠度指标低于目标疲劳可靠度指标,设置限载为36.5 t时疲劳可靠度能够满足疲劳安全要求;当前荷载水平下行车道最大日均货车交通量为3 820 veh,运营过程中交通量增加显著时应加强钢桥面板疲劳损伤检测,必要时采取车辆分流或桥梁限载措施。

关键词：桥梁工程钢桥面板疲劳可靠度限载动态称重疲劳累积损伤理论

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On-chip frequency combs and telecommunications signal processing meet quantum optics

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Frontiers of Optoelectronics 2018年第2期11卷 134-147页

作者： Christian REIMER Yanbing ZHANG Piotr ROZTOCKI Stefania SCIARA Luis Romero CORTES Mehedi ISLAM Bennet FISCHER Benjamin WETZEL Alfonso Carmelo CINO sai tak chu Brent LITTLE David MOSS Lucia CASPANI Jose AZANA Michael KUES Roberto MORANDOTTI Institut National de la Recherche Scientifique - Centre Energie Matrriaux et Telecommunications (INRS-EMT) 1650 Boulevard Lionel-Boulet Varennes Qurbec J3X 1S2 Canada Department of Energy Information Engineering and Mathematical Models University of Palermo Palermo Italy Department of Physics & Astronomy University of Sussex Falmer Brighton BN1 9QH UK Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong China State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710119 China Centre for Micro Photonics Swinburne University of Technology Hawthorn Victoria 3122 Australia Institute of Photonics Department of Physics University of Strathclyde Glasgow G1 1RD UK School of Engineering University of Glasgow Rankine Building Oakfield Avenue Glasgow G 12 8LT UK Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China National Research University of Information Technologies Mechanics and Optics St Petersburg 197101 Russia

Entangled optical quantum states are essential towards solving questions in fundamental physics and are at the heart of applications in quantum information science. For advancing the research and development of quantum technologies, practical access to the generation and manipulation of photon states carrying significant quantum resources is required. Recently, integrated photonics has become a leading platform for the compact and cost- efficient generation and processing of optical quantum states. Despite significant advances, most on-chip non- classical light sources are still limited to basic bi-photon systems formed by two-dimensional states （i.e., qubits）. An interesting approach beating large potential is the use of the time or frequency domain to enabled the scalable on- chip generation of complex states. In this manuscript, we review recent efforts in using on-chip optical frequency combs for quantum state generation and telecommunica- tions components for their coherent control. In particular, the generation of bi- and multi-photon entangled qubit states has been demonstrated, based on a discrete time domain approach. Moreover, the on-chip generation of high-dimensional entangled states （quDits） has recentlybeen realized, wherein the photons are created in a coherent superposition of multiple pure frequency modes. The time- and frequency-domain states formed with on-chip frequency comb sources were coherently manipulated via off-the-shelf telecommunications compo- nents. Our results suggest that microcavity-based entangled photon states and their coherent control using accessible telecommunication infrastructures can open up new venues for scalable quantum information science.

关键词： nonlinear optics quantum optics entangledphotons

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胃印戒细胞癌皮肤转移1例并文献复习

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肿瘤研究与临床 2024年第4期36卷 302-304页

作者：李照岚赵赛单昆昆王储张琪蔡建辉河北北方学院研究生学院张家口075000 河北省人民医院胃肠外科石家庄050051 华北理工大学研究生学院唐山063210

目的探讨胃印戒细胞癌皮肤转移的临床表现、鉴别诊断及治疗。方法回顾性分析河北省人民医院2018年5月收治的1例胃印戒细胞癌皮肤转移患者的临床病理资料,并复习相关文献。结果患者为61岁男性,入院后完善胃镜及CT等相关检查诊断为胃癌,... 详细信息

目的探讨胃印戒细胞癌皮肤转移的临床表现、鉴别诊断及治疗。方法回顾性分析河北省人民医院2018年5月收治的1例胃印戒细胞癌皮肤转移患者的临床病理资料,并复习相关文献。结果患者为61岁男性,入院后完善胃镜及CT等相关检查诊断为胃癌,行胃癌根治术。术后病理诊断为胃印戒细胞癌,规律行多次化疗,化疗期间肩背部皮肤出现红色皮肤结节及斑块,局部皮肤皮革样增厚,皮沟加深,触之较硬,更换多次化疗方案后仍未见缓解。行皮肤穿刺活组织检查综合诊断为胃印戒细胞癌皮肤转移。结论胃印戒细胞癌是高度恶性的肿瘤之一,皮肤转移罕见,当出现皮肤转移时需与其他皮肤良性病变进行鉴别,且目前晚期胃癌皮肤转移治疗方案尚不明确,需结合病情酌情使用化疗、靶向及免疫等综合治疗。

关键词：癌,印戒细胞胃皮肤转移

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响应面法优化山楂多糖和山药多糖的提取工艺及其抗氧化活性研究

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中国调味品 2024年第7期49卷 38-44,59页

作者：杨欣宇高赛刘寅初高晓炜冯随高晓光河北科技大学食品与生物学院石家庄050018 河北双鸽食品股份有限公司石家庄050021 石家庄市生猪产业技术研究院石家庄050021 廊坊市晟味食品有限公司河北廊坊065600

该研究优化超声波辅助热水提取山楂多糖和山药多糖的工艺,并研究其单糖组成和抗氧化活性。在单因素试验的基础上,以超声时间、料液比和浸提温度为因素,以多糖提取率为响应值,采用响应面法建立模型并分析。研究发现山楂多糖提取工艺的最... 详细信息

该研究优化超声波辅助热水提取山楂多糖和山药多糖的工艺,并研究其单糖组成和抗氧化活性。在单因素试验的基础上,以超声时间、料液比和浸提温度为因素,以多糖提取率为响应值,采用响应面法建立模型并分析。研究发现山楂多糖提取工艺的最佳参数为超声时间28 min、料液比1∶24.8(g/mL)、浸提温度71.5℃、浸提时间120 min,在此条件下,提取率为49.09%;山药多糖提取工艺的最佳参数为超声时间42 min、料液比1∶30(g/mL)、浸提温度70.0℃、浸提时间180 min,在此条件下,提取率为12.81%。通过离子色谱法确定了山楂多糖和山药多糖的单糖组成和比例。由体外抗氧化试验可知,山楂多糖对DPPH自由基、ABTS自由基、羟基自由基的清除率分别为80.58%、97.61%、68.4%,表现出较强的自由基清除能力。

关键词：山楂多糖山药多糖单糖超声波自由基抗氧化活性

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基于CEEMDAN和小波包分解的闸门振动信号降噪研究

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水电站机电技术 2024年第1期47卷 16-18,119页

作者：李初辉孔令超董懿杨赛黄天雄中国长江电力股份有限公司湖北宜昌443000

针对闸门监测振动信号去噪问题,提出基于CEEMDAN(经验模态分解)和小波包分解的闸门振动信号降噪算法,通过采用CEEMDAN和小波包分解方法进行信号去噪,可以有效处理水电站泄洪闸门振动信号中受到的外部干扰。CEEMDAN方法能够将信号分解成... 详细信息

针对闸门监测振动信号去噪问题,提出基于CEEMDAN(经验模态分解)和小波包分解的闸门振动信号降噪算法,通过采用CEEMDAN和小波包分解方法进行信号去噪,可以有效处理水电站泄洪闸门振动信号中受到的外部干扰。CEEMDAN方法能够将信号分解成多个本征模态函数(IMF),每个IMF代表不同频率的振动成分,使得外部干扰和真实信号成分可以分离。随后,小波包分解能够将每个IMF进一步分解成不同尺度和频率的子频带,这有助于更准确地定位和分离干扰成分。对每个子频带应用阈值去噪技术,可以有效去除噪声,保留真实信号。由测试结果可知,该算法能很好地剔除闸门振动信号中的无用噪声,有效提高闸门振动信号的准确性。

关键词：闸门振动信号 CEEMDAN 小波包分解阈值降噪

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