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arXiv 2021年

作者： Zuo, Guanhua Zhang, Yuchi Li, Jing Zhu, Shiyao Guo, Yanqiang Zhang, Tiancai State Key Laboratory of Quantum Qptics and Quantum Optics Devices Collaborative Innovation Center of Extreme Optics Institute of Opto-Electronics Shanxi University Taiyuan030006 China College of Physics and Electronic Engineering Shanxi University Taiyuan030006 China Department of Physics Zhejiang University Hangzhou310027 China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan030600 China

Weak squeezed vacuum light, especially resonant to the atomic transition, plays an important role in quantum storage and generation of various quantum sources. However, the general homodyne detection (HD) cannot determine weak squeezing due to the low signal to noise ratio and the limited resolution of the HD system. Here we provide an alternative method based on photon statistics measurement to determine the weak squeezing of the squeezed vacuum light generated from an optical parametric oscillator working far below the threshold. The approach is established the relationship between the squeezing parameter and the second-order degree of coherence. The theoretical analysis agrees well with the experiment results. The advantage of this method is that it provides a feasible and reliable experimental measure to determine the weak squeezing with high precision and the measurement is independent on the detection efficiency. This method can be used to measure other quantum features for various quantum states with extremely weak non-classicality. Copyright © 2021, The Authors. All rights reserved.

关键词： Optical parametric oscillators

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Flat-band Line states in Photonic Kagome Lattices

Flat-band Line states in Photonic Kagome Lattices

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第9届纳米操纵、制造与测量国际会议

作者： Xianglian Liu Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyChina

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Semidiscrete optical vortex droplets in quasi-phase-matched photonic crystals

arXiv

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arXiv 2023年

作者： Xu, Xiaoxi Zhao, Feiyan Huang, Jiayao He, Hexiang Zhang, Li Chen, Zhaopin Nie, Zhongquan Malomed, Boris A. Li, Yongyao School of Physics and Optoelectronic Engineering Foshan University Foshan528000 China School of Electronic and Computer Engineering Peking University Shenzhen518055 China Physics Department Solid-State Institute Technion Haifa32000 Israel Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan030024 China Department of Physical Electronics School of Electrical Engineering Faculty of Engineering Tel Aviv University Tel Aviv69978 Israel Instituto de Alta Investigación Universidad de Tarapacá Casilla 7D Arica Chile Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology Foshan University Foshan528000 China

A new scheme for producing semidiscrete self-trapped vortices ("swirling photon droplets") in photonic crystals with competing quadratic (χ(2)) and self-defocusing cubic (χ(3)) nonlinearities is proposed. The photonic crystal is designed with a striped structure, in the form of spatially periodic modulation of the χ(2) susceptibility, which is imposed by the quasi-phase-matching technique. Unlike previous realizations of semidiscrete optical modes in composite media, built as combinations of continuous and arrayed discrete waveguides, the semidiscrete vortex "droplets" are produced here in the fully continuous medium. This work reveals that the system supports two types of semidiscrete vortex droplets, viz., onsite- and intersite-centered ones, which feature, respectively, odd and even numbers of stripes, N. Stability areas for the states with different values of N are identified in the system's parameter space. Some stability areas overlap with each other, giving rise to the multistability of states with different N. The coexisting states are mutually degenerate, featuring equal values of the Hamiltonian and propagation constant. An experimental scheme to realize the droplets is outlined, suggesting new possibilities for the long-distance transmission of nontrivial vortex beams in nonlinear media. © 2023, CC BY.

关键词： Photonic crystals

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Large-range Dynamic Strain Measurement Using Chaotic BOCDA

Large-range Dynamic Strain Measurement Using Chaotic BOCDA

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International Conference on Optical Communications and Networks (ICOCN)

作者： Yahui Wang Le Zhao Mingjiang Zhang Jianzhong Zhang Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan China

We propose and demonstrate a wide-range dynamic strain measurement system using single-slope assisted chaotic BOCDA. In SBS-based chaotic sensors, the linewidth of chaotic BGS is naturally broaden due to the multi-frequency pump wave. Thus, the linear section is provided a large dynamic range. This experiment is the first that a dynamic strain of 1200 με can be accurately identified using the single-slope assisted method, which is a significant improvement. The proposed method has a great demand potential in large-scale dynamic strain measurement.

关键词： Strain Strain measurement Frequency measurement Probes Scattering Optical fibers Chaotic communication

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A Novel High Energy Efficiency Electronic control Independent Variable Speed Closed Circuit Steering system for Wheel Loader

A Novel High Energy Efficiency Electronic Control Independen...

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International Conference on Fluid Power and Mechatronics (FPM)

作者： Wang Xiangyu Quan Long Yang Jing Feng Jiangjiang Zhang Xiaogang Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan China

ISBN: (数字)9781728103112

ISBN: (纸本)9781728103129

In order to reduce energy loss of steering system, a high energy efficiency electronic control independent variable speed closed circuit steering principle is proposed. All the hydraulic valves of the original steering system are removed, the required flow of the hydraulic steering cylinder is supplied by the fixed displacement pump, independently and directly. The servo motor speed is set proportional to the steering speed of an independent electric controlled steering wheel. Thus the output flow and the output volume of the pump match with steering speed and the steering angular of the wheel loader, respectively. To verify the feasibility and stability of the steering system during the automatic steering process, firstly, a co-simulation model of proposed steering system is built in the SimulationX software. Then, in order to validate the dynamic characteristics of the steering system, the test prototype of it is established. Finally, energy consumption of new steering systems is analyzed. Based on the results, by using the energy-saving closed circle pump controlled flow matching steering system the throttling loss, the relief loss and the median unloading loss of the steering process are eliminated, the energy consumption is reduced by 61%. A wheel loader can save about 83. 6 L of fuel. If this energy-saving steering system is adopted to all wheel loaders in china, the carbon emissions of 3.3 * 10 4 T will be reduced per year.

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Chaos generation by a hybrid integrated chaotic semiconductor laser

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Chinese Physics B 2018年第5期27卷 122-130页

作者： Ming-Jiang Zhang Ya-Nan Niu Tong Zhao Jian-Zhong Zhang Yi Liu Yu-Hang Xu Jie Meng Yun-Cai Wang An-Bang Wang Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuan 030024China Institute of Optoelectronic Engineering College of Physics&OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China

We design a hybrid integrated chaotic semiconductor laser with short-cavity optical *** can be assembled in a commercial butterfly shell with just three *** of them is coated by a transflective film to provide the optical feedback for chaos generation while insuring regular laser *** prove the feasibility of the chaos generation in this compact structure and provide critical external parameters for the fabrication by theoretical *** than the usual changeless internal parameters used in previous simulation research,we extract the real parameters of the chip by ***,the maps of the largest Lyapunov exponent with varying bias current and feedback intensity Kap demonstrate the dynamic characteristics under different external-cavity *** laser chip has its own optimal external cavity length(L)and feedback intensity(Kap)to generate chaos because of the different internal *** have acquired two ranges of optimal parameters(L=4 mm,0.12〈Kap〈0.2 and L=5 mm,0.07〈Kap〈0.12)for two different chips.

关键词： chaotic dynamic characteristics integrated chaotic semiconductor laser short-cavity optical feedback extraction of internal parameters

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GPR detection of underground void based on low-rank and sparse representation 17

GPR detection of underground void based on low-rank and spar...

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17th International Conference on Ground Penetrating Radar, GPR 2018

作者： Liu, Li Han, Yinping Li, Jingxia Xu, Hang Wang, Bingjie Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781538657775

Underground void detection is important due to its effects on subsidence higher risk. Ground penetrating radar (GPR) is a nondestructive geophysical electromagnetic method and has been widely used in underground void detection or cavities locator. However, because of heavy clutter conditions, the void response is usually obscured. In this paper, an imaging-followed-removal algorithm based on low-rank and sparse representation is presented to suppress the clutter and obtain the void geometrical properties. The proposed algorithm firstly focus the sparsity of the raw data using Frequency-Wavenumber migration imaging method, and then removal the clutter by the robust principle component analysis (RPCA) method. Simulation results of air-filled void, air-water-filled void, and void with pipeline in its side show that our proposed algorithm can remove the dutter efficiently and then the void information can be easily obtained, which is beneficial to further identification. © 2018 IEEE.

关键词： Ground penetrating radar systems

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Temperature Sensing Characteristics of Surface Acoustic Wave Brillouin Scattering in Optical Microfibers

Temperature Sensing Characteristics of Surface Acoustic Wave...

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Yi Liu Yuanqi Gu Pengfei Chen Rongrong Guo Yao Yao Yajun You Wenjun He Xiu-Jian Chou Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology 79 West Yingze Street Taiyuan China Institute of Optoelectronic Engineering College of Physics and Optoelectronics Taiyuan University of Technology 79 West Yingze Street Taiyuan China Strong Digital Technology Co. Ltd. (Thinvent) Nanchang China Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education North University of China 3 Xueyuan Street Taiyuan China College of Mechatronics Engineering North University of China Taiyuan China Science and Technology on Electronic Test and Measurement Laboratory School of Instrument and Electronics North University of China Taiyuan China

ISBN: (纸本)9781665409889

Abstract-Temperature sensing characteristics of surface acoustic wave Brillouin scattering in 1-1.3 $\mu\mathrm{m}$ diameter optical microfibers are simulated by using the elastodynamic equation including the electrostrictive stress. A multi-peak Brillouin gain spectrum with rather high scattering efficiency is observed. The highest temperature sensitivity of the surface acoustic mode is 0.568 MHz/°C. Meanwhile, the temperature sensitivity of the surface acoustic mode is less affected by fiber diameter changes, ranging from 0.05 to 0.25 MHz/°C/$\mu\mathrm{m}$. It can be found that using SAW BS for temperature sensing would put less stress on manufacturing constraints for optical microfibers. Moreover, the results provide guidance for the further improving the performance of temperature sensing in the microelectronics field.

关键词： Temperature sensors Optical fibers Optical fiber sensors Temperature distribution Sensitivity Surface acoustic waves Microelectronics

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Life-detection radar based on wideband chaotic signal

Life-detection radar based on wideband chaotic signal

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IET International Radar Conference 2018, IRC 2018

作者： Xu, Hang Li, Ying Li, Liqiang Zhang, Jianguo Han, Hong Liu, Li Wang, Bingjie Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology No. 79 Yingze West Main Street Taiyuan China College of Physics and Optoelectronics Taiyuan University of Technology No. 79 Yingze West Main Street Taiyuan China

We propose a novel life-detection radar using a wideband Boolean-chaos signal as a probe signal. The range between the radar and the human target can be obtained by correlating the echo signal from the target with its delayed duplicate. This range is modulated periodically by human chest's displacements along the recording time axis and the modulation frequency is the same as the respiratory frequency. Therefore, the authors propose a life-detection algorithm based on correlation method to detect the human target's respiratory frequency and range. Experimental results demonstrate that the authors' radar can simultaneously detect the respiratory frequency and range of the human target behind a 20-cm-thick wall. In addition, the high range resolution and excellent anti-jamming property of the chaotic radar have been demonstrated by their previous studies, which make it perform superbly in complex electromagnetic environments. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Tracking radar

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0.75 Gbit/s high-speed classical key distribution with mode-shift keying chaos synchronization of Fabry-Perot lasers

arXiv

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arXiv 2020年

作者： Gao, Hua Wang, Anbang Wang, Longsheng Jia, Zhiwei Guo, Yuanyuan Gao, Zhensen Yan, Lianshan Qin, Yuwen Wang, Yuncai Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan China School of Information Engineering Guangdong University of Technology Guangzhou China Guangdong Provincial Key Laboratory of Photonics Information Technology Guangzhou China Center for Information Photonics and Communications School of Information Science and Technology Southwest Jiaotong University Chengdu China

High-speed physical key distribution is diligently pursued for secure communication. In this paper, we propose and experimentally demonstrate a scheme of high-speed key distribution using mode-shift keying chaos synchronization between two multi-longitudinal-mode Fabry–Perot lasers commonly driven by a super-luminescent diode. Legitimate users dynamically select one of the longitudinal modes according to private control codes to achieve mode-shift keying chaos synchronization. The two remote chaotic light waveforms are quantized to generate two raw random bit streams, and then those bits corresponding to chaos synchronization are sifted as shared keys by comparing the control codes. In this method, the transition time, i.e., the chaos synchronization recovery time is determined by the rising time of the control codes rather than the laser transition response time, so the key distribution rate is improved greatly. Our experiment achieved a 0.75-Gbit/s key distribution rate with a bit error rate of 3.8 × 10-3 over 160-km fiber transmission with dispersion compensation. The entropy rate of the laser chaos is evaluated as 16 Gbit/s, which determines the ultimate final key rate together with the key generation ratio. It is therefore believed that the method pays a way for Gbit/s physical key distribution. © 2020, CC0.

关键词： Synchronization

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