Article
Engineering, Electrical & Electronic
Shijie Deng, Hao Zhang, Shitai Yang, Ming Chen, Yu Cheng, Hongchang Deng, Houquan Liu, Libo Yuan, Chuanxin Teng
Summary: A photon-counting optical time-domain reflectometry (PC-OTDR) based optical fiber temperature sensor system is proposed and demonstrated experimentally. The system utilizes a high-speed photon-counting module for fast measurement and a cascade fiber structure for temperature sensing. Experimental results show that the system can accurately measure the temperature and locate the sensing position in a short time.
IEEE PHOTONICS JOURNAL
(2022)
Article
Biophysics
Peidong Hua, Zhenyang Ding, Kun Liu, Haohan Guo, Ming Pan, Teng Zhang, Sheng Li, Junfeng Jiang, Tiegen Liu
Summary: A distributed optical fiber biosensor based on tapered fiber and optical frequency domain reflectometry (OFDR) is proposed in this paper. By measuring the shift of the local Rayleigh backscattering spectra (RBS) caused by the refractive index (RI) change of the external medium surrounding the tapered fiber using OFDR, the concentration change of anti-human IgG can be located. This distributed sensor has the potential to achieve micron-level localization of biochemical substances such as cancer cells.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Engineering, Mechanical
Sergei Mikhailov, Jeroen van Wittenberghe, Geert Luyckx, Philippe Thibaux, Thomas Geernaert, Francis Berghmans
Summary: In this study, we demonstrated the application of distributed fiber optic strain sensing based on optical frequency-domain reflectometry for early detection and location of fatigue cracks in welds in steel tubular test specimens. By subjecting the specimens to resonant bending load and continuously measuring the strain distributions with high resolution, we successfully detected and located fatigue cracks originating from the inner surface of the specimens in real time. The detection of crack initiation may provide relevant information for estimating the remaining lifetime of the component.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Optics
Huajian Zhong, Cailing Fu, Lijie Wang, Bin Du, Pengfei Li, Yanjie Meng, Lin Chen, Chao Du, Yiping Wang
Summary: This study proposes a high-spatial-resolution optical frequency domain reflectometry method with a single interferometer, using a self-compensation technique to successfully eliminate phase noise and obtain a compensated signal with high signal-to-noise ratio. The high spatial resolution is achieved by analyzing the length of the delay fiber at different measurement distances. This method has great potential in the field of distributed measurement.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Andrea Baggio, Matteo Turani, Massimo Olivero, Milena Salvo, Diego Pugliese, Marco Sangermano
Summary: A new system is developed to detect hydrocarbons using optical fiber distributed sensing. The system utilizes a custom-designed optical fiber with silica core and thin silicone cladding, providing quick and selective absorption of oil products and insensitivity to water. By detecting Rayleigh backscattering, the system demonstrates a rapid response to high refractive index hydrocarbons, with a response time of approximately 1 s. Furthermore, in its high-resolution version, the system can accurately locate leakages with an accuracy of 14 cm.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Chenhuan Wang, Kun Liu, Zhenyang Ding, Yuanyao Li, Dongfang Zhu, Ming Pan, Zeen Chen, Haohan Guo, Sheng Li, Junfeng Jiang, Yin Yu, Tiegen Liu
Summary: This paper introduces a method of real time distributed dynamic strain sensing in OFDR using GPU, which significantly improves the data processing rate due to the parallel processing capability of GPU. Experimental results show that utilizing GPU for parallel computing increases the total processing time by 81 times, achieving high speed and high resolution dynamic strain sensing.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Peihong Li, Yu Wang, Kang Yin, Xin Liu, Qing Bai, Hongjuan Zhang, Yan Gao, Baoquan Jin
Summary: This article proposes a coherent detection phase-sensitive optical time-domain reflectometry (T-OTDR) without optical amplifier using random coding method. By injecting a series of pulses modulated by random codes into the optical fiber, the signal-to-noise ratio (SNR) is enhanced and the sensing distance is extended. The proposed system successfully locates and demodulates the vibration signal at a longer distance compared to the traditional single pulse scheme with erbium doped fiber amplifier (EDFA).
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Javier Preciado, Pascual Sevillano, Carlos Heras, Jesus Subias, David Sanahuja, Enrique Carretero, Juan J. Martinez
Summary: This work introduces a novel scheme based on in-line optical repeaters to extend the sensing range of distributed acoustic sensors, achieving a total sensing range above 120 km while maintaining a pulse frequency of 2.5 kHz. The experimental results demonstrate the correct measurement of stimuli and show that the sensing range in DD C-OTDR can be extended without reducing the frequency response bandwidth or increasing scheme complexity.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Teng Zhang, Zhenyang Ding, Kun Liu, Haohan Guo, Peidong Hua, Sheng Li, Ming Pan, Ji Liu, Junfeng Jiang, Tiegen Liu
Summary: We demonstrate a short-time long distance distributed high-temperature sensing by non-local Haar transform (NLH) in optical frequency domain reflectometry (OFDR). With the proposed NLH method, we achieved a short-time distributed high-temperature sensing ranging from 950 degrees C to 1050 degrees C over 102 m by reduced-cladding single mode fiber (RC-SMF) with a sensing spatial resolution of 2 cm. The NLH method has a best performance to restore the consistency of spectral shift distribution caused by the same temperature change without deterioration of sensing spatial resolution compared with traditional image denoising methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Shuai Li, Zengguang Qin, Zhaojun Liu, Xiyu Yang, Yanping Xu
Summary: This study proposes and demonstrates a long-distance optical frequency domain reflectometry (OFDR) with high spatial resolution based on time division multiplexing. By reconfiguring the system layout in a time-division-multiplexed manner, distributed strain sensing with high spatial resolution over long sensing range can be achieved. The proposed system allows flexible spatial resolutions in each sub-sensing unit without crosstalk among them.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Hua Zheng, Huan Wu, Chern Yang Leong, Yuyao Wang, Xinliang Shen, Zheng Fang, Xin Cheng, Jingxian Cui, Dingjiong Ma, Yun Miao, Li Zhou, Min Yan, Jie Sun, Hwa-Yaw Tam, Xiaoli Ding, Chao Lu
Summary: This paper proposes and experimentally demonstrates an enhanced quasi-distributed accelerometer array utilizing phase-sensitive optical time-domain reflectometry (f-OTDR) and ultraweak fiber Bragg grating (UWFBG). A transducer cylinder is used to convert vibration signals to axial strain in the sensing fiber, achieving high sensitivity in vibration measurement. An array of UWFBGs with backscattering enhanced points along the fiber is employed to improve the signal-to-noise ratio (SNR). As a result, quasi-distributed vibration sensing with a resolution of 0.03 g and a flat sensitivity of 1.4 rad/g in a frequency range of 50 to 800 Hz is achieved over a 500-m long UWFBG. The proposed system offers high sensing sensitivity, large multiplexing capacity, and resistance to interference fading, making it suitable for structural health monitoring of large buildings and machinery.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
Xin Lu, Peter James Thomas
Summary: Phase-sensitive optical time-domain reflectometry (fOTDR) is a technology for distributed vibration sensing using phase recovery of backscattered light. This study investigates the phase errors introduced by measurement noise in an fOTDR system based on an imbalanced Mach-Zehnder interferometer (IMZI) and a 3 x 3 coupler. The analysis shows that the phase error is inversely proportional to the power of backscattered light and an analytical expression is derived to estimate it. The error using the DCM algorithm is slightly smaller than that using I/Q demodulation, but increases with longer measurement times.
Article
Chemistry, Analytical
Cailing Fu, Pengfei Li, Ronglong Sui, Zhenwei Peng, Huajian Zhong, Xiaoyu Yin, Yiping Wang
Summary: This research demonstrates a high-spatial-resolution OFDR distributed temperature sensor based on Au-SMF, which successfully demodulates the measured temperature between 50 and 600 degrees C with high accuracy and temperature sensitivity.
Article
Chemistry, Analytical
Sina Sedighi, Marcelo A. Soto, Alin Jderu, Dorel Dorobantu, Marius Enachescu, Dominik Ziegler
Summary: Distributed chemical sensing is achieved using standard acrylate coated optical fibers, where swelling of the coating induces strain in the fiber's silica core. This concept has been validated by measuring strain responses of various aqueous and organic solvents. Thermal effects can be discriminated from strain using uncoated fiber segments, leading to more accurate strain readings.
Article
Engineering, Electrical & Electronic
M. P. Lipus, S. Kranz, T. Reinsch, C. Cunow, J. Henninges, M. Reich
Summary: This paper presents a novel distributed shear stress sensor that allows for the derivation of fluid rheological parameters along a fiber-optic cable. Laboratory experiments have demonstrated that the sensor can distinguish differences of 1 mPa s dynamic viscosities in a low range.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Optics
Zheng-Da Li, Xu-Fei Yin, Zizhu Wang, Li-Zheng Liu, Rui Zhang, Yu-Zhe Zhang, Xiao Jiang, Jun Zhang, Li Li, Nai-Le Liu, Xiao-Bo Zhu, Feihu Xu, Yu-Ao Chen, Jian-Wei Pan
Article
Optics
Zheng-Ping Li, Xin Huang, Yuan Cao, Bin Wang, Yu-Huai Li, Weijie Jin, Chao Yu, Jun Zhang, Qiang Zhang, Cheng-Zhi Peng, Feihu Xu, Jian-Wei Pan
PHOTONICS RESEARCH
(2020)
Article
Multidisciplinary Sciences
Yu-Ao Chen, Qiang Zhang, Teng-Yun Chen, Wen-Qi Cai, Sheng-Kai Liao, Jun Zhang, Kai Chen, Juan Yin, Ji-Gang Ren, Zhu Chen, Sheng-Long Han, Qing Yu, Ken Liang, Fei Zhou, Xiao Yuan, Mei-Sheng Zhao, Tian-Yin Wang, Xiao Jiang, Liang Zhang, Wei-Yue Liu, Yang Li, Qi Shen, Yuan Cao, Chao-Yang Lu, Rong Shu, Jian-Yu Wang, Li Li, Nai-Le Liu, Feihu Xu, Xiang-Bin Wang, Cheng-Zhi Peng, Jian-Wei Pan
Summary: Quantum key distribution has shown promise in enabling secure communication, with successful demonstrations in the laboratory and small-scale networks tested outside. However, global deployment faces challenges due to current technological limitations, although quantum repeaters could potentially provide a solution.
Article
Instruments & Instrumentation
Yu-Qiang Fang, Kai Luo, Xing-Guo Gao, Gai-Qing Huo, Ang Zhong, Peng-Fei Liao, Pu Pu, Xiao-Hui Bao, Yu-Ao Chen, Jun Zhang, Jian-Wei Pan
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Physics, Multidisciplinary
Wen-Zhao Liu, Ming-Han Li, Sammy Ragy, Si-Ran Zhao, Bing Bai, Yang Liu, Peter J. Brown, Jun Zhang, Roger Colbeck, Jingyun Fan, Qiang Zhang, Jian-Wei Pan
Summary: The ability to generate random numbers without relying on devices is crucial for many applications, but comes with the challenge of violating Bell inequalities. An experiment demonstrated device-independent randomness expansion with high certified bits gain and security against quantum adversaries, pushing towards commercial viability.
Article
Physics, Multidisciplinary
Ming-Han Li, Xingjian Zhang, Wen-Zhao Liu, Si-Ran Zhao, Bing Bai, Yang Liu, Qi Zhao, Yuxiang Peng, Jun Zhang, Yanbao Zhang, W. J. Munro, Xiongfeng Ma, Qiang Zhang, Jingyun Fan, Jian-Wei Pan
Summary: Device-independent quantum randomness expansion is a viable method to generate random numbers of high security level in quantum mechanics, and the experimental realization reported in this study is secure against quantum side information through quantum probability estimation. The process successfully generated quantum-proof random bits while expanding the randomness storage, setting the base for applying quantum-certifiable random bits in practical applications.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Cheng Wu, Jianjiang Liu, Xin Huang, Zheng-Ping Li, Chao Yu, Jun-Tian Ye, Jun Zhang, Qiang Zhang, Xiankang Dou, Vivek K. Goyal, Feihu Xu, Jian-Wei Pan
Summary: NLOS imaging reconstructs hidden objects from indirect light paths, achieving breakthroughs in long-range imaging. Hardware and software innovations have successfully increased the standoff distance of NLOS imaging, opening up new possibilities for related applications.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Optics
Zheng-Ping Li, Jun-Tian Ye, Xin Huang, Peng-Yu Jiang, Yuan Cao, Yu Hong, Chao Yu, Jun Zhang, Qiang Zhang, Cheng-Zhi Peng, Feihu Xu, Jian-Wei Pan
Summary: Long-range active imaging using single-photon lidar systems faces limitations in practical applications due to weak echo signals and high background noise. However, a compact coaxial single-photon lidar system has been developed, capable of achieving 3D imaging up to 201.5 km using high-efficiency optical devices and a new noise-suppression technique. Photon-efficient computational algorithms enable accurate 3D imaging over hundreds of kilometers with minimal signal photons per pixel, representing a significant advancement in practical, low-power lidar technology for extra-long ranges.
Article
Physics, Applied
Bing Bai, Jianyao Huang, Guan-Ru Qiao, You-Qi Nie, Weijie Tang, Tao Chu, Jun Zhang, Jian-Wei Pan
Summary: Quantum random number generators can produce true random numbers, but speed and size are the two most important compromised parameters for practical applications. This study presents the fastest and miniaturized QRNG with a record real-time output rate of 18.8 Gbps by combining a photonic integrated chip and optimized randomness extraction technology, demonstrating excellent characteristics of integration and high-frequency response.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Si-Ran Zhao, Yu-Zhe Zhang, Wen-Zhao Liu, Jian-Yu Guan, Weijun Zhang, Cheng-Long Li, Bing Bai, Ming-Han Li, Yang Liu, Lixing You, Jun Zhang, Jingyun Fan, Feihu Xu, Qiang Zhang, Jian-Wei Pan
Summary: The experiment demonstrates the application of distributed quantum sensing in practice, successfully achieving the unconditional violation of the shot-noise limit and testing sensing for long distances and random parameters. This represents an important step towards a practical quantum sensing network.
Article
Optics
Bi-Xiao Wang, Shi-Biao Tang, Yingqiu Mao, Wenhua Xu, Ming Cheng, Jun Zhang, Teng-Yun Chen, Jian-Wei Pan
Summary: This study presents a practical downstream QAN over 10G-EPON, which can support up to 64 users. Positive results were achieved in both the single feeder fiber structure coexistence scheme and the dual feeder fiber structure coexistence scheme, marking an important step towards the realization of large-scale QKD infrastructure.
Article
Physics, Multidisciplinary
Yong Yu, Peng-Fei Sun, Yu-Zhe Zhang, Bing Bai, Yu-Qiang Fang, Xi-Yu Luo, Zi-Ye An, Jun Li, Jun Zhang, Feihu Xu, Xiao-Hui Bao, Jian-Wei Pan
Summary: In this experiment, an atomic-ensemble quantum memory was verified using a measurement-device-independent scheme. A single photon was stored in one atomic ensemble and later retrieved for interference with a second photon for a joint Bell-state measurement. By evaluating correlations between random states and BSM results, the memory's ability to preserve entanglement was confirmed.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Dian Wu, Qi Zhao, Can Wang, Liang Huang, Yang-Fan Jiang, Bing Bai, You Zhou, Xue-Mei Gu, Feng-Ming Liu, Ying-Qiu Mao, Qi-Chao Sun, Ming-Cheng Chen, Jun Zhang, Cheng-Zhi Peng, Xiao-Bo Zhu, Qiang Zhang, Chao-Yang Lu, Jian-Wei Pan
Summary: This paper reports on the closure of the locality and detection loopholes in multiparticle self-testing experiments in both photonic and superconducting systems. Three-party and four-party GHZ states have been certified with high fidelities using device-independent methods.
PHYSICAL REVIEW LETTERS
(2022)
Article
Instruments & Instrumentation
Chao Yu, Tianyi Li, Xian-Song Zhao, Hai Lu, Rong Zhang, Feihu Xu, Jun Zhang, Jian-Wei Pan
Summary: In this study, a 4H-SiC single-photon avalanche diode (SPAD) based free-running ultraviolet single-photon detector (UVSPD) with ultralow afterpulse probability is reported. A beveled mesa structure is designed and fabricated for the 4H-SiC SPAD, which shows the characteristic of ultralow dark current. A readout circuit of passive quenching and active reset with a tunable hold-off time setting is further developed to significantly suppress the afterpulsing effect. The nonuniformity of photon detection efficiency (PDE) across the SPAD active area is investigated for performance optimization. The compact UVSPD shows a PDE of 10.3%, a dark count rate of 133 kcps, and an afterpulse probability of 0.3% at 266 nm, indicating its potential for practical ultraviolet photon-counting applications.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Applied
Jun-Tian Ye, Chao Yu, Wenwen Li, Zheng-Ping Li, Hai Lu, Rong Zhang, Jun Zhang, Feihu Xu, Jian-Wei Pan
Summary: We demonstrate photon-counting single-pixel imaging in the ultraviolet region using a 4H-SiC single-photon avalanche diode (SPAD) as a high-performance compact single-photon detector. By developing a tailored readout circuit with active hold-off time, we restrain detector noise and operate the SPAD in the free-running mode. With structured illumination, we reconstruct compressed images at a 4 fps frame rate, demonstrating the capability of ultraviolet imaging applications.
APPLIED PHYSICS LETTERS
(2023)
