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| 1 | All-silicon dual-cavity fiber-optic pressure sensor with ultralow pressure-temperature cross-sensitivity and wide working temperature range显示文摘Pressure-temperature cross-sensitivity and its accompanying temperature-related stability is a nerve-wracking obstruction for pressure sensor performance in a wide temperature range.To solve this problem,we propose a novel(to the best of our knowledge)all-silicon dual-cavity optical Fabry–Perot interferometer(FPI)pressure sensor.The all-silicon structure has high intrinsic reflectivity and is able to eliminate the influence of thermal-expansion-mismatch-induced stress and chemical-reaction-induced gas generation,and therefore,in essence,enhances measurement accuracy.From the experiment results,the pressure-temperature cross-sensitivity is reduced to be∼5.96 Pa/℃,which presents the lowest pressure-temperature cross-sensitivity among the FPI pressure sensors with the capability of surviving high temperatures up to 700℃ thereby opening the way for high-precision pressure monitoring in various harsh and remote environments. | Xue Wang Junfeng Jiang Shuang Wang Kun Liu Tiegen Liu | 2021 | Photonics Research2021，9，4： | 7 |
| 2 | Phase demodulation method based on a dual-identical-chirped-pulse and weak fiber Bragg gratings for quasi-distributed acoustic sensing显示文摘A phase demodulation method for quasi-distributed acoustic sensing(DAS)systems based on a dual-identicalchirped-pulse and weak fiber Bragg gratings(WFBGs)is proposed.Compared to the use of Rayleigh backscattering light in optical fibers,the implementation of WFBGs can contribute to obtaining an optical signal with a higher signal-to-noise ratio(SNR).The dual-identical-chirped-pulse is generated by a time-delay fiber,and the sinusoidal carrier is generated by the interference between the two chirped pulses reflected by adjacent WFBGs.The phase of the sinusoidal carrier represents the dynamic strain change posed on the sensing fiber.Discrete Fourier transform is used to directly retrieve the phase information.The performance of the phase demodulation from interference signals under different sinusoidal carrier frequencies and SNRs is numerically investigated.The piezoelectric transducer is employed to emulate the sound in the experiment to verify the effectiveness of our method.It is shown that the dynamic strain can be well reconstructed at the end of a 101.64 km fiber when the signal SNR is down to 3.234 d B.Our proposed method enables the application of the long-distance sensing in quasi-DAS systems. | Guanhua Liang Junfeng Jiang Kun Liu Shuang Wang Tianhua Xu Wenjie Chen Zhe Ma Zhenyang Ding Xuezhi Zhang Yongning Zhang Tiegen Liu | 2020 | Photonics Research2020，8，7： | 6 |
| 3 | Optimal design of Er/Yb co-doped fiber amplifiers with an Yb-band fiber Bragg grating显示文摘In this paper, Er/Yb co-doped fiber amplifiers(EYDFAs) with an Yb-band fiber Bragg grating(FBG) at the pump end to improve the performance of the amplifier is systematically studied. The influence of the reflectivity and center wavelength of the FBG along with the gain-fiber length on the performance of an EYDFA are numerically analyzed. The results show that the wavelength of the FBG has critical influence on the efficiency of the EYDFA,whereas the requirement to its reflectivity is relaxed. It is an effective and promising way to improve the efficiency of a high-power pumped EYDFA by introducing a suitable Yb-band FBG at the pump end. Based on the analysis of the underlying principles, suggestions for the practical design and possible further improvement strategies are also proposed. | Qun Han Wenchuan Yan Yunzhi Yao Yaofei Chen Tiegen Liu | 2016 | Photonics Research2016，4，2： | 3 |
| 4 | Performance improvement approaches for optical fiber SPR sensors and their sensing applications显示文摘Optical fiber surface plasmon resonance(SPR) sensors point toward promising application potential in the fields of biomarker detection,food allergen screening,and environmental monitoring due to their unique advantages.This review outlines approaches in improving the fiber SPR sensing performance,e.g.,sensitivity,detection accuracy,reliability,cross-sensitivity,selectivity,convenience and efficiency,and corresponding sensing applications.The sensing principles of SPR sensors,especially the performance indicators and their influencing factors,have been introduced.Current technologies for improving the fiber SPR performance and their application scenarios are then reviewed from the aspects of fiber substrate,intrinsic layer(metal layer),and surface nanomaterial modification.Reasonable design of the substrate can strengthen the evanescent electromagnetic field and realize the multi-parameter sensing,and can introduce the in situ sensing self-compensation,which allows corrections for errors induced by temperature fluctuation,non-specific binding,and external disturbances.The change of the intrinsic layer can adjust the column number,the penetration depth,and the propagation distance of surface plasmon polaritons.This can thereby promote the capability of sensors to detect the large-size analytes and can reduce the full width at half-maximum of SPR curves.The modification of various-dimensionality nanomaterials on the sensor surfaces can heighten the overlap integral of the electromagnetic field intensity in the analyte region and can strengthen interactions between plasmons and excitons as well as interactions between analyte molecules and metal surfaces.Moreover,future directions of fiber SPR sensors are prospected based on the important and challenging problems in the development of fiber SPR sensors. | JIANYING JING KUN LIU JUNFENG JIANG TIANHUA XU SHUANG WANG JINYING MA ZHAO ZHANG WENLIN ZHANG TIEGEN LIU | 2022 | Photonics Research2022，10，1： | 3 |
| 5 | Fiber loop ring-down cavity integrated U-bent single-mode-fiber for magnetic field sensing显示文摘A novel magnetic field sensing system based on the fiber loop ring-down technique is proposed in this paper. In the fiber loop, a U-bent single-mode-fiber structure coated with magnetic fluid(MF) serves as the sensing head, and an erbium-doped fiber amplifier(EDFA) is introduced to compensate for the intrinsic loss of the cavity. The ring-down time of the system varies with the change of applied magnetic field due to the tunable absorption coefficient and refractive index of the MF. Therefore, measurement of the magnetic field can be realized by monitoring the ringdown time. The experimental results show that the performance of the system is extremely dependent on the interrogation wavelength, because both the gain of the EDFA and the loss of the sensing head are wavelength dependent.We found that at the optimal wavelength, the ratio of the gain to loss attained its maximum. The sensing system was experimentally demonstrated and a sensitivity of-0.5951 μs∕Oe was achieved. | Yaofei Chen Tiegen Liu Qun Han Wenchuan Yan Lin Yu | 2016 | Photonics Research2016，4，6： | 3 |
| 6 | A Polarized Low-Coherence Interferometry Demodulation Algorithm by Recovering the Absolute Phase of A Selected Monochromatic Frequency显示文摘 | JIANG Junfeng WANG Shaohua LIU Tiegen | 2012 | Optics Express2012，20，18： | 1 |
| 7 | Long-Range Vibration Sensor Based on Correlation Analysis of Optical Frequency-Domain Reflectometry Signals显示文摘 | DING Zhenyang YAO Xiaotian LIU Tiegen | 2012 | Optics Express2012，20，28： | 1 |
| 8 | Compensation of Laser Frequency Tuning Nonlinearity of a Long Range OFDR Using Deskew Filter显示文摘 | DING Zhenyang YAO Xiaotian LIU Tiegen | 2013 | Optics Express2013，21，3： | 1 |
| 9 | Variable wavelength fiber Bragg gratings written with a phase mask and four prisms 显示文摘 | Zhang Yimo Li Chuan Liu Tiegen | 2002 | Chinese Journal of Lasers2002，，11： | 1 |
| 10 | Side-polished SMS based RI sensor employing macro-bending perfluorinated POF显示文摘A refractive index(RI)sensor based on perfluorinated plastic optical fiber(PF-POF)is introduced in this paper.The PF-POF as multi-mode fiber was side-polished(SP)to form a macro-bending single-mode-multimode-single-mode(SMS)structure.Both ends of the sensor were closely connected to single-mode quartz optical fiber(SMF).The spectral char-acteristics of the sensor are measured,analyzed and discussed.The results show that when the length of PF-POF is 8 cm,the macro-bending radius is 3 cm,and the SP-depth is 20μm.The intensity sensitivity reaches−219.504 dBm/RIU in the range of RI=1.330~1.356.A reference is provided for the application of PF-POF in RI sensor in the future.The sensor is featured with low-cost,good flexibility and high efficiency. | Xuezhi Zhang Boyue Yang Junfeng Jiang Kun Liu Xiaojun Fan Zhaozhu Liu Min Peng Guanlong Chen Tiegen Liu | 2021 | Opto-Electronic Advances2021，4，10： | 1 |
| 11 | Optical time-series signals classification based on data augmentation for small sample显示文摘Dear editor,The analysis of captured 1D time-series sequences has been a challenge in engineering research such as sensing for a long time.1D time series often exhibit more abstract and complex characteristics in engineering.For example,continuous or pulsed ultrasound is often used in ultrasonic detection[1]to transmit and receive energy in the medium to assess the location of damage or the degree of wear in the workpiece to be measured. | Xuezhi ZHANG Haonan SUN Junfeng JIANG Kun LIU Zeyu LI Jiahang JIN Wenxin BO Yin YU Tiegen LIU | 2022 | Science China(Information Sciences)2022，65，12： | 1 |
| 12 | Application of Fiber Bragg Grating Sensor on Measurement of Tensile Stress in a Seven Wire Prestressed Steel Strand显示文摘 | LIU Tiegen JIANG Junfeng Lin Xin | 2005 | Journal of Optoelectronies · Laser2005，16，10： | 1 |
| 13 | Fusion of Hand Vein, Iris and Fingerprint for Person Identity Verification Based on Bayesian Theory 显示文摘 | LI Xiuyan LIU Tiegen DENG Shichao | 2009 | Proeeeeding of SPIE(S0277-786X)2009，7512，： | 1 |
| 14 | Two-dimensional distributed strain sensing with an Archimedean spiral arrangement in optical frequency domain reflectometry显示文摘We demonstrate a distributed two-dimensional(2D)strain-sensing system in optical frequency domain reflectometry(OFDR)with an Archimedean spiral arrangement of the sensing fiber.The Archimedean spiral describes a simple relationship between the radial radius and polar angle,such that each circle(the polar angle from0 to 2π)can sense the 2D strain in all directions.The strain between two adjacent circles can also be easily obtained because an Archimedean spiral facilitates sensing of every angle covering the full 2D range.Based on the mathematical relation of Archimedean spirals,we deduce the relationship between the one-dimensional position of the sensing fiber and 2D distribution in polar coordinates.The results of the experiment show that an Archimedean spiral arrangement system can achieve 2D strain sensing with different strain load angles. | Yamei Guo Zhenyang Ding Kun Liu Junfeng Jiang Chenhuan Wang Tiegen Liu | 2018 | Nanotechnology and Precision Engineering2018，1，3： | 1 |
| 15 | Solution processable transition metal dichalcogenides-based hybrids for photodetection显示文摘Transition metal dichalcogenides(TMDs), as one of the most promising two-dimensional(2D) materials, have attracted considerable attention for use in photodetection applications over the past few years due to their distinct properties, such as atomic-scale thickness, tunable direct bandgaps, and decent carrier mobilities at room temperature. Compared with pure 2D TMDs, the construction of hybrids consisting of TMDs and other low-dimensional materials can further improve the performance of photodetectors including their spectral range, responsivity and detectivity, which significantly boosts interest in the development of TMDs-based photodetectors. On the other hand, solution-phase synthesis methods provide a facile strategy for the scalable production of TMD hybrids, opening an exciting avenue to develop low-cost devices. In this review, we summarize the material synthesis, characterizations, and photodetection applications of the solution processable TMDs-based hybrids, as well as provide insights into their prospects. | Yingdong Han Jie Wang Haoran Wan Shuang Wang Haofeng Hu Ting-Hui Xiao Zhenzhou Cheng Tiegen Liu | 2019 | Nano Materials Science2019，1，4： | 1 |
| 16 | Weak Fiber Bragg Grating Based Sensing System for Cryogenic Static Test of Launch Vehicle Oxygen Tank显示文摘In this paper,a weak fiber Bragg grating(WFBG)based sensing system applied to the cryogenic static test of launch vehicle oxygen tanks has been developed and the results of an evaluation are reported.A customized sensor encapsulation and installation method allow for precise strain measurement at cryogenic temperatures.The reflection peaks of series-connected WFBGs with low optical loss are obtained,ensuring high system reliability in harsh environments.The experimental results show that the maximum full-scale error is less than 0.81%full-scale error.The temperature is as low as−193℃ during the test.This study also demonstrates a practical method in which WFBG can be used to obtain critical parameters for structural monitoring in a cryogenic environment. | Zhang Xuezhi Chen Guanlong Jiang Junfeng Fan Xiaojun Liu Kun Wang Shuang Liu Yantao Ni Jingda Liu Tiegen | 2021 | 激光与光电子学进展2021，58，21： | 0 |
| 17 | Highly sensitive and stable probe refractometer based on configurable plasmonic resonance with nano-modified fiber core显示文摘A dispersion model is developed to provide a generic tool for configuring plasmonic resonance spectral characteristics.The customized design of the resonance curve aiming at specific detection requirements can be achieved.According to the model,a probe-type nano-modified fiber optic configurable plasmonic resonance(NMF-CPR)sensor with tip hot spot enhancement is demonstrated for the measurement of the refractive index in the range of 1.3332-1.3432 corresponding to the low-concentration biomarker solution.The new-type sensing structure avoids excessive broadening and redshift of the resonance dip,which provides more possibilities for the surface modification of other functional nanomaterials.The tip hot spots in nanogaps between the Au layer and Au nanostars(AuNSs),the tip electric field enhancement of AuNSs,and the high carrier mobility of the WSe_(2)layer synergistically and significantly enhance the sensitivity of the sensor.Ex-perimental results show that the sensitivity and the figure of merit of the tip hot spot enhanced fiber NMF-CPR sensor can achieve up to 2995.70 nm/RIU and 25.04 RIU^(−1),respectively,which are 1.68 times and 1.29 times higher than those of the conventional fiber plasmonic resonance sensor.The results achieve good agreements with numerical simulations,demonstrate a better level compared to similar reported studies,and verify the correctness of the dispersion model.The detection resolution of the sensor reaches up to 2.00×10^(−5)RIU,which is obviously higher than that of the conventional side-polished fiber plasmonic resonance sensor.This indicates a high detection accuracy of the sensor.The dense Au layer effectively prevents the intermediate nanomaterials from shedding and chemical degradation,which enables the sensor with high stability.Furthermore,the terminal reflective sensing structure can be used as a practical probe and can allow a more convenient operation. | Jianying Jing Kun Liu Junfeng Jiang Tianhua Xu Shuang Wang Tiegen Liu | 2023 | Opto-Electronic Advances2023，6，6： | 0 |
| 18 | Integrated optoelectronics with two-dimensional materials显示文摘As we enter the post-Moore era,heterogeneous optoelectronic integrated circuits(OEICs)are attracting significant attention as an alternative approach to scaling to smaller-sized transistors.Two-dimensional(2D)materials,offering a range of intriguing optoelectronic properties as semiconductors,semimetals,and insulators,provide great potential for developing nextgeneration heterogeneous OEICs.For instance,Fermi levels of 2D materials can be tuned by applying electrical voltages,while their atomically thin geometries are inherently suited for the fabrication of planar devices without suffering from lattice mismatch.Since the first graphene-on-silicon OEICs were demonstrated in 2011,2D-material heterogeneous OEICs have significantly progressed.To date,researchers have a better understanding of the importance of interface states on the optical properties of chip-integrated 2D materials.Moreover,there has been impressive progress towards the use of 2D materials for waveguide-integrated lasers,modulators,and photodetectors.In this review,we summarize the history,status,and trend of integrated optoelectronics with 2D materials. | Zhenzhou Cheng Rongxiang Guo Jiaqi Wang Yi Wang Zhengkun Xing Lei Ma Wei Wei Yu Yu Hon Ki Tsang Tiegen Liu | 2022 | National Science Open2022，1，3： | 0 |
| 19 | Recent Progress of Fiber Sensing Technologies in Tianjin University显示文摘The up to date progress of fiber sensing technologies in Tianjin University are proposed in this paper.Fiber-optic temperature sensor based on the interference of selective higher-order modes in circular optical fiber is developed.Parallel demodulation for extrinsic Fabry-Perot interferometer(EFPI)and fiber Bragg grating(FBG)sensors is realized based on white light interference.Gas concentration detection is realized based on intra-cavity fiber laser spectroscopy.Polarization maintaining fiber(PMF)is used for distributed position or displacement sensing.Based on the before work and results,we gained National Basic Research Program of China on optical fiber sensing technology and will develop further investigation in this area. | Tiegen LIU Kun LIU Junfeng JIANG Enbang LI Hongxia ZHANG Dagong JIA Yimo ZHANG | 2011 | Photonic Sensors2011，1，1： | 0 |
| 20 | Achievable information rate optimization in C‑band optical fber communication system显示文摘Optical fber communication networks play an important role in the global telecommunication network.However,nonlinear efects in the optical fber and transceiver noise greatly limit the performance of fber communication systems.In this paper,the product of mutual information(MI)and communication bandwidth is used as the metric of the achievable information rate(AIR).The MI loss caused by the transceiver is also considered in this work,and the bit-wise MI,generalized mutual information(GMI),is used to calculate the AIR.This loss is more signifcant in the use of higher-order modulation formats.The AIR analysis is carried out in the QPSK,16QAM,64QAM and 256QAM modulation formats for the communication systems with diferent communication bandwidths and transmission distances based on the enhanced Gaussian noise(EGN)model.The paper provides suggestions for the selection of the optimal modulation format in diferent transmission scenarios. | Zheng Liu Tianhua Xu Ji Qi Joshua Uduagbomen Jian Zhao Tiegen Liu | 2023 | Frontiers of Optoelectronics2023，16，2： | 0 |
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