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Long-term ultrastable frequency dissemination via a 50-km spooled fiber link using a two-section DFB laser

Chinese Optics Letters 2024年第1期22卷 164-169页

作者：尹知谦张川博管世健周昕王亚光王磊磊郑满航刘奕彤张云山朱兴邦方涛陈向飞 engineering Research Center of Precision Photonics Integration and System application Ministry of Education&Key Laboratory of Intelligent Optical Sensing and ManipulationMinistry of Education&National Laboratory of Solid State Microstructures&College of Engineering and Applied Sciences&Institute of Optical Communication Engineering&Nanjing University-Tongding Joint Lab for Large-Scale Photonic Integrated CircuitsNanjing UniversityNanjing 210023China College of Electronics and Optical engineering and College of Flexible Electronics Nanjing University of Posts and TelecommunicationsNanjing 210023China The 41st Research Institute of China Electronics technology Group Corp Qingdao 266000China

The stable long-distance transmission of radio-frequency(RF)signals holds significant importance from various aspects,including the comparison of optical frequency standards,remote monitoring and control,scientific research and experiments,and RF spectrum management.We demonstrate a scheme where an ultrastable frequency signal was transmitted over a 50 km coiled fiber.The optical RF signal is generated using a two-section distributed feedback(DFB)laser for direct modulation based on the reconstruction equivalent chirp(REC)technique.The 3-dB modulation bandwidth of the two-section DFB laser is 18 GHz and the residual phase noise of-122.87 dBc/Hz is achieved at 10-Hz offset frequency.We report a short-term stability of 1.62×10^(-14)at an average time of 1 s and a long-term stability of 6.55×10^(-18)at the measurement time of 62,000 s when applying current to the front section of the DFB laser.By applying power to both sections,the stability of the system improves to 4.42×10^(-18)within a testing period of 56,737 s.Despite applying temperature variations to the transmission link,long-term stability of 8.63×10^(-18)at 23.9 h can still be achieved.

关键词： frequency dissemination two-section DFB laser phase stability

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Parametric study on contact sensors for MASW measurement-based interfacial debonding detection for SCCS

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Earthquake engineering and engineering Vibration 2024年第2期23卷 331-344页

作者： Chen Hongbing Pang Xin Gan Shiyu Li Yuanyuan Gokarna Chalise Nie Xin Research Institute of Urbanization and Urban Safety School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Civil engineering Tsinghua UniversityBeijing 100084China Faculty of Infrastructure engineering Dalian University of TechnologyDalian 116081China

Steel-concrete composite structures(SCCS)have been widely used as primary load-bearing components in large-scale civil infrastructures.As the basis of the co-working ability of steel plate and concrete,the bonding status plays an essential role in guaranteeing the structural performance of SCCS.Accordingly,efficient non-destructive testing(NDT)on interfacial debondings in SCCS has become a prominent research area.Multi-channel analysis of surface waves(MASW)has been validated as an effective NDT technique for interfacial debonding detection for SCCS.However,the feasibility of MASW must be validated using experimental measurements.This study establishes a high-frequency data synchronous acquisition system with 32 channels to perform comparative verification experiments in depth.First,the current sensing approaches for high-frequency vibration and stress waves are summarized.Secondly,three types of contact sensors,namely,piezoelectric lead-zirconate-titanate(PZT)patches,accelerometers,and ultrasonic transducers,are selected for MASW measurement.Then,the selection and optimization of the force hammer head are performed.Comparative experiments are carried out for the optimal selection of ultrasonic transducers,PZT patches,and accelerometers for MASW measurement.In addition,the influence of different pasting methods on the output signal of the sensor array is discussed.Experimental results indicate that optimized PZT patches,acceleration sensors,and ultrasonic transducers can provide efficient data acquisition for MASW-based non-destructive experiments.The research findings in this study lay a solid foundation for analyzing the recognition accuracy of contact MASW measurement using different sensor arrays.

关键词： steel-concrete composite structures(SCCS) interface debonding detection multi-channel analysis of surface waves(MASW) sensor selection comparative experimental study

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Static light scattering properties of a ZnO nanosphere aqueous suspension at visible and near-infrared wavelengths

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Chinese Optics Letters 2017年第1期15卷 104-109页

作者：武浩鹏史久林严峰杨俊杰张余宝何兴道 Jiangxi engineering laboratory for optoelectronics testing technology Nanchang Hangkong University Nanchang 330063 China national engineering laboratory for Nondestructive testing and Optoelectric sensing technology and application Nanchang Hangkong University Nanchang 330063 China

The scattering properties of ZnO nanospheres with four different particle diameters of 10, 50, 100, and 200 nm suspended in water are investigated theoretical and experimentally in the spectral range of the entire visible range and part of the near-infrared region. The scattering properties of ZnO nanospheres suspended in water are described by employing three main parameters： the angular distribution of the scattering intensity I, the scattering extinction coefficient ascat, and the scattering cross section ascat. The results indicate that （i） at a certain wavelength, the angular distribution of the scattering intensity appears as an obviously forward- propagating feature, and the forward-scattering intensity is dominant gradually when the particle diameter in- creases from 10 to 200 nm, and （ii） the scattering extinction coefficient and cross section can be determined by using the measured transmittance changes of a pure water sample and a given ZnO sample; they all are shown to be dependent on the particle size and incident wavelength. The experimental results of four different scattering samples agree well with the theoretical predictions within the given wavelength range.

关键词： Angular distribution Infrared devices Light scattering Nanospheres Particle size Suspensions (fluids) Zinc oxide

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Photo-induced Ag modulating carbon dots:Greatly improved fluorescent properties and derived sensing application

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Chinese Chemical Letters 2024年第1期35卷 338-342页

作者： Yuwei Wang Ye Li Guixiang Yang Xiaofeng Yang Chenglu Yan Huaqiao Peng Huiyong Wang Juan Du Baozhan Zheng Yong Guo Department of Chemistry Sichuan UniversityChengdu 610064China Institute of Quality Standard and testing technology for Agro-products Sichuan Academy of Agricultural SciencesChengdu 610066China Key laboratory of Aviation Fuel&Chemical Airworthiness and Green Development The Second Research Institute of Civil Aviation Administration of ChinaChengdu 610041China School of Chemistry and Chemical engineering Henan Normal UniversityXinxiang 453007China

Carbon dots(CDs)have been attracted much attention and widely studied due to their excellent fluorescence(FL)properties,better biocompatibility and outstanding photo/chemical stability.However,the disadvantage of lower quantum yield(QY)still limits its wide application.Herein,we reported a novel and convenient strategy to prepare photo-induced Ag/CDs(p-Ag/CDs)by irradiating the mixed Ag+and hydrophobic CDs(h-CDs)acetone solution with ultraviolet(UV)light.The obtained p-Ag/CDs exhibit a greatly enhanced FL emission together with a blue shift(460 nm)than h-CDs(520 nm).The QY of p-Ag/CDs is measured to be 51.1%,which is 10.4 times higher than that of h-CDs(4.9%),indicating that photo-induced Ag modulation can effectively improve the optical properties of CDs.The mechanisms for the FL enhancement and blue shift of h-CDs are studied in detail.The results prove that the greatly enhanced FL emission is from the generated Ag nanoparticles(AgNPs)by UV light irradiation based on metal-enhanced fluorescence(MEF),and the increased oxygen-contained groups in this process lead to the blue shift in CDs fluorescence.Interestingly,the p-Ag/CDs exhibit higher sensitivity and selectivity for sulfide ions(S2-)detection than that of h-CDs,which have a lower response to S2-.This work not only offers a novel strategy to improve the FL properties of materials but also endows them with new functions and broadens their application fields.

关键词： Carbon dots Photo-induced Ag modulating Fluorescent enhancement High quantum yield Derived sensing application Sulfide determination

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Asymmetric and Single-Side Splitting of Dissipative Solitons in Complex Ginzburg–Landau Equations with an Asymmetric Wedge-Shaped Potential

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Chinese Physics Letters 2019年第1期36卷 24-27页

作者：廖云程刘彬刘娟陈佳 national engineering laboratory for destructive testing and optoelectronic sensing technology and application Nanchang HangKong University Nanchang Institute of Science and technology

We report some novel dynamical phenomena of dissipative solitons supported by introducing an asymmetric wedge-shaped potential(just as a sharp ‘razor') into the complex Ginzburg–Landau equation with the cubicquintic nonlinearity. The potentials corresponding to a local refractive index modulation with breaking symmetry can be realized in an active optical medium with respective expanding antiwaveguiding structures. Using the razor potential acting on a central dissipative soliton, possible outcomes of asymmetric and single-side splitting of dissipative solitons are achieved with setting different strengths and steepness of the potentials. The results can potentially be used to design a multi-route splitter for light beams.

关键词： Dissipative Solitons Complex Ginzburg-Landau Equations Asymmetric Wedge-Shaped Potential

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Review of the application of in-situ sensing techniques to address the tea growth characteristics from leaf to field

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International Journal of Agricultural and Biological engineering 2024年第1期17卷 1-11页

作者： Qiong Cao Chunjiang Zhao Ze Xu Ping Jiang Haibin Yang Xiangyu Meng Guijun Yang Information technology Research Center Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China College of Machnical and Electrical engineering Hunan Agricultural UniversityChangsha 410125China Tea Research Institute of Chongqing Academy of Agricultural Sciences Chongqing 400000China

The tea plant is a valuable and evergreen crop that is extensively cultivated in China and many other countries.Currently,there is growing research interest in this plant.For the tea industry,it is crucial to develop rapid and non-invasive methods to evaluate tea plants in their natural environment.This article provides a comprehensive overview of non-invasive sensing techniques used for in-situ detection of tea plants.The topics covered include leaf,canopy,and field-level assessments,as well as statistical analysis techniques and characteristics specific to the research.Non-invasive testing technology is primarily used for monitoring and predicting tea pests and diseases,monitoring quality,and nutrients,determining tenderness and grade,identifying tea plant varieties,automatically detecting,and identifying tea buds,monitoring tea plant growth,and extracting tea garden areas through remote sensing.It also helps to evaluate planting suitability,assess disasters,and estimate yields.Additionally,the article examines the challenges and prospects of emerging techniques aimed at resolving the in-situ detection problem for tea plants.It can assist researchers and producers in comprehensively understanding the tea environment,quality characteristics,and growth process,thereby enhancing tea production quality,and fostering tea industry development.

关键词： non-destructive in-situ detection tea plants growth characteristics sensors

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Asymmetrical tapered SMS fiber coupler for simultaneous measurement of temperature and refractive index and its application for biosensing

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Chinese Optics Letters 2020年第6期18卷 34-39页

作者：吴哲宇刘彬朱江峰刘娟万生鹏吴涛孙敬华 School of Physics and optoelectronic engineering Xidian UniversityXi’an 710071China national engineering laboratory for destructive testing and optoelectronic sensing technology and application Nanchang Hangkong UniversityNanchang 330063China School of Electrical engineering&Intelligentization Dongguan University of TechnologyDongguan 523808China

An asymmetrical tapered singlemode–multimode–singlemode(SMS)fiber coupler based on two parallel physical contact SMS fiber structures was proposed.Since the coupler includes modes both from fiber core and cladding,two dips of the transmission spectrum exhibit different sensing characteristics to the surrounding temperature and refractive index(RI)change,which allows the use of the standard matrix inversion method to determine temperature and RI simultaneously.The temperature sensitivities of 0.0498 and 0.0324 nm/℃ and RI sensitivities of 1151.76 and 1325.66 nm/RIU have been achieved,respectively.For biosensing application,with the functionalized fiber coupler sensor,a human chorionic gonadotropin concentration of 0.05 mIU/mL has been detected for a wavelength shift of 0.2 nm with good stability and excellent selectivity.The developed tapered SMS fiber coupler structure has advantages of simultaneous measurement of two independent parameters,simple configuration,low cost,and good repeatability that offer a great potential for medical diagnostics.

关键词： optical fiber sensing fiber coupler biosensor human chorionic gonadotropin

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High-performance fiber-integrated multifunctional graphene-optoelectronic device with photoelectric detection and optic-phase modulation

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Photonics Research 2020年第12期8卷 1949-1957页

作者： LINQING ZHUO PENGPENG FAN SHUANG ZHANG YUANSONG ZHAN YANMEI LINYU ZHANG DONGQUAN LI ZHEN CHE WENGUO ZHU HUADAN ZHENG JIEYUAN TANG JUN ZHANG YONGCHUN ZHONG WENXIAO FANG GUOGUANG LU JIANHUI YU ZHE CHEN Key laboratory of optoelectronic Information and sensing Technologies of Guangdong Higher Education Institutes Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China engineering Research Center on Visible Light Communication of Guangdong Province Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China Key laboratory of Visible Light Communications of Guangzhou Jinan UniversityGuangzhou 510632China Science and technology on Reliability Physics and application of Electronic Component laboratory China Electronic Product Reliability and Environmental Testing Research InstituteGuangzhou 510610China

In graphene-based optoelectronic devices,the ultraweak interaction between a light and monolayer graphene leads to low optical absorption and low responsivity for the photodetectors and relative high half-wave voltage for the phase modulator.Here,an integration of the monolayer graphene onto the side-polished optical fiber is demonstrated,which is capable of providing a cost-effective strategy to enhance the light–graphene interaction,allowing us to obtain a highly efficient optical absorption in graphene and achieve multifunctions:photodetection and optical phase modulation.As a photodetector,the device has ultrahigh responsivity(1.5×10^(7) A/W)and high external quantum efficiency(>1.2×10^(9)%).Additionally,the polybutadiene/polymethyl methacrylate(PMMA)film on the graphene can render the device an optical phase modulator through the large thermo-optic effect of the PMMA.As a phase modulator,the device has a relatively low half-wave voltage of 3 V with a 16 dB extinction ratio in Mach–Zehnder interferometer configuration.

关键词： optoelectronic fiber modulator

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Rapid self-healing,self-adhesive,anti-freezing,moisturizing,antibacterial and multi-stimuli-responsive PVA/starch/tea polyphenol-based composite conductive organohydrogel as flexible strain sensor

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Journal of Materials Science & technology 2023年第4期135卷 199-212页

作者： Tao Ke Li Zhao Xin Fan Haibin Gu Key laboratory of Leather Chemistry and engineering of Ministry of Education Sichuan UniversityChengdu 610065China national engineering Research Center of Clean technology in Leather Industry Sichuan UniversityChengdu 610065China

The complexity of application environment stimulates the development of wearable devices based on functional hydrogels.Among all the promising performances,self-healing and self-adhesion properties are ideal for hydrogel sensors,which can guarantee good accuracy,comfort and long service life.However,it is still a challenge to achieve simultaneous self-healing and self-adhesion in different environments(in the air,underwater and at low temperatures).Herein,a feasible new strategy was successfully carried out to prepare a starch-based composite conductive organohydrogel based on the reversible borate ester bonds formed by complexing starch/polyvinyl alcohol(PVA)/tea polyphenol(TP)with borax,and multiple hydrogen-bond interactions among PVA,starch,TP and ethylene glycol(EG).Silver nanoparticles(Ag-NPs),reduced and stabilized by TP,and MWCNTs(multi-walled carbon nanotubes)were introduced into the cross-linking networks to endow the resulting PBSTCE organohydrogel with considerable antibacterial property and conductivity,respectively.The organohydrogel possessed rapid self-healing(HE(self-healing efficiency)=96.07%in 90 s,both in the air and underwater,also at-20℃),considerable self-adhesion(both in the air and underwater,also at-20℃),remarkable stretchability(814%of elongation),anti-freezing(-20℃)and moisture-retention abilities,antibacterial activity,sensitive pH/sugar-responsiveness,and plasticity.The strain sensor formed by the PBSTCE organohydrogel can not only effectively record large-scale human motions(e.***.finger/wrist/elbow bending,walking,etc.),but also accurately capture subtle motion changes(e.***.breathing,chewing,swallowing,speaking,smiling and frowning).Moreover,the self-healed organohydrogel sensor also exhibited almost invariable mechanical,electrical and sensing behaviors.This work demonstrates a feasible strategy to construct multifunctional starch-based organohy-drogels,and promotes their efficient,stable and eco-friendly application as flexible wearable devices.

关键词： Conductive organohydrogel Strain sensor Self-healing Self-adhesive Anti-freezing Antibacterial

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Highly sensitive and miniature microfiber-based ultrasound sensor for photoacoustic tomography

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Opto-Electronic Advances 2022年第6期5卷 55-62页

作者： Liuyang Yang Yanpeng Li Fang Fang Liangye Li Zhijun Yan Lin Zhang Qizhen Sun School of Optical and Electronic Information&national engineering laboratory for Next Generation Internet Access System(NGIA)&Wuhan national laboratory for optoelectronics(WNLO) Huazhong University of Science and TechnologyWuhan 430074China Aston Institute of Photonic Technologies Aston UniversityBirmingham B47ETUK.

A microfiber with large evanescent field encapsulated in PDMS is proposed and demonstrated for ultrasound sensing.The compact size and large evanescent field of microfiber provide an excellent platform for the interaction between optical signal and ultrasound wave,exhibiting a high sensitivity of 3.5 mV/kPa,which is approximately 10 times higher than the single-mode fiber sensor.Meanwhile,a phase feedback stabilization module is introduced into the coherent demodulation system for long-term stable measurement.In addition,a photoacoustic tomography experiment with the microfiber ultrasound sensor is implemented to verify the excellent performance on imaging,with the depth of 12 mm,the highest lateral resolution of 65μm and axial resolution of 250μm,respectively.The highly sensitive microfiber ultrasound sensor provides a competitive alternative for various applications,such as industrial non-destructive testing,biomedical ultrasound and photoacoustic imaging.

关键词： ultrasound sensor microfiber photoacoustic tomography

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