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A DFB fiber Laser sensor System with Ultra-High Resolution and Its Noise Analysis

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Journal of Electronic Science and Technology of China 2008年第4期6卷 453-457页

作者： Hao Xiao Fang Li Jun He Yu-Liang Liu Optoelectric SystemLaboratory Institute of Semiconductors Chinese Academy of SciencesBeijing 100083 China Sifang Electrics （C）Toup） Co. LTD Bcijing100084 China

A distributed feedback fiber laser （DFB FL） sensor system with ultra-high resolution is described. The sensor is made by writing distributed feedback structures into a high gain active fiber, and the system employs an unbalanced Michelson interferometer to translate laser wavelength shifts induced by weak measurands into phase shifts. A digital phase generated carrier demodulation scheme is introduced to achieve ultra-high resolution interrogation. A detailed noise analysis of the system is presented, and it is shown that the system resolution is limited by the frequency noise of the DFB FL.

关键词： Distributed feedback fiber sensor system fiber sensor interferometer noise analysis,phase generated carrier.

PGC MODULATION BASED ON PZTFOR fiber INTERFEROMETERIC sensor

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PGC MODULATION BASED ON PZTFOR FIBER INTERFEROMETERIC SENSOR

Highly sensitive fiber refractive index sensor based on side-core holey structure

2012全国压电和声波理论及器件技术研讨会

作者： De-sheng CHEN Xiao-di HUANG Hai-bin WANG Lei JIANG Institute of Acoustics Chinese Academy of Sciences

The phase generated carrier（PGC） modulation-demodulation technique is the main demodulation technique for fiber interferometric *** are two methods to realize PGC *** method is inner modulation,and the other is external ***,there is less study on the PGC external modulation than the PGC inner *** this paper,we focus on the PGC external modulation to analyze its *** experiment results indicate that the external demodulation performs ***,its cost is much lower than that of inner modulation.

关键词： PZT PGC Modulation fiber sensor

来源： cnki会议评论

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Chinese Physics B 2014年第10期23卷 225-229页

作者：韩雅夏历刘德明 Next Generation Internet Access National Engineering Laboratory (NGIA) School of Optical and Electronic InformationHuazhong University of Science and Technology (HUST)

We propose a side-core holey fiber （SCHF）-based surface plasmon resonance （SPR） sensor to achieve high refractive index （RI） sensitivity. The SCHF structure can facilitate analyte filling and enhance the overlapping area of the core mode and surface plasmon polariton （SPP） mode. The coupling properties of the sensor are analyzed by numerical simulation. The maximum sensitivity of 5000 nm/RIU in an RI range of 1.33-1.44, and the average sensitivity of 9295 nm/RIU in an RI range from 1.44 to 1.54 can be obtained.

关键词： holy fiber surface plasmon resonance refractive index fiber sensor

Advances in femtosecond laser direct writing of fiber Bragg gratings in multicore fibers:technology,sensor and laser applications

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Opto-Electronic Advances 2022年第4期5卷 48-68页

作者： Alexey Wolf Alexander Dostovalov Kirill Bronnikov Mikhail Skvortsov Stefan Wabnitz Sergey Babin Novosibirsk State University Novosibirsk 630090Russia Institute of Automation and Electrometry of the SB RAS Novosibirsk 630090Russia Department of Information Electronics and Telecommunications EngineeringSapienza University of RomeRome 00184Italy

In this article,we review recent advances in the technology of writing fiber Bragg gratings(FBGs)in selected cores of multicore fibers(MCFs)by using femtosecond laser *** writing technology of such a key element as the FBG opens up wide opportunities for the creation of next generation fiber lasers and sensors based on *** advantages of the technology are shown by using the examples of 3D shape sensors,acoustic emission sensors with spatially multiplexed channels,as well as multicore fiber Raman lasers.

关键词： multicore fiber fiber Bragg grating femtosecond laser micromachining fiber laser fiber sensor

Active wavefront shaping for controlling and improving multimode fi ber sensor

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Journal of Innovative Optical Health Sciences 2019年第4期12卷 127-135页

作者： Tianting Zhong Zhipeng Yu Huanhao Li Zihao Li Haohong Li Puxiang Lai Department of Biomedical Engineering Hong Kong Polytechnic University Hong Kong P.R.China Shenzhen Research Institute Hong Kong Polytechnic University Shenzhen 518057 P.R.China Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan Hubei 430074P.R.China

Wavefront shaping(WFS)techniques have been used as a powerful tool to control light propagation in complex media,including multimode *** this paper,we propose a new application of WFS for multimode fber-based *** use of a single multimode fiber alone,without any special fabrication,as a sensor based on the light intensity variations is not an easy *** twist effect on multimode fiber is used as an example *** results show that light intensity through the multimode fiber shows no direct relationship with the twist angle,but the correlation coefficient(CC)of speckle patterns ***,if WFS is applied to transform the spatially seemingly random light pattern at the exit of the multimode fiber into an optical *** focal pattern correlation and intensity both can serve to gauge the twist angle,with doubled measurement range and allowance of using a fast point detector to provide the *** further development,WFS may find potentials to facilitate the development of multimode fber-based sensors in a variety of scenarios.

关键词： Multimode fiber wavefront shaping scattering media fiber sensor optical focusing

High-power EDFA applied in distributed optical fiber Raman temperature sensor system

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Frontiers of Optoelectronics 2009年第2期2卷 210-214页

作者： Xu ZHANG Deming LIU Hairong LIU Qizhen SUN Zhifeng SUN Ziheng XU Wengang WANG College of Optoelectronic Science and Engineering Huazhong University of Science and Technology

In this paper, a high-power erbium-doped fiber amplifier(EDFA) for the temperature sensor system is theoretically designed and experimentally demonstrated. It consists of an erbium-doped fiber that is pumped bidirectionally with two 980-nm high-power laser diodes(LDs). At the EDFA input, an optical isolator(ISO) is used to ensure that the signal pulse transmits forward only. After that, a wavelength division multiplexer(WDM) is employed to combine the forward pump laser(980 nm)and incident optical pulse(1550 nm) into the erbiumdoped fiber for direct amplification in the optical *** the EDFA output, another WDM couples the backward pump laser(980 nm) into the erbium-doped fiber and outputs the amplified optical pulse(1550 nm) with an ISO followed to isolate the backscattering light. According to this structure, we carried out the experiment in the condition as follows. For 980 nm pump LD, the operating current is 590 mA, and the setting temperature is 25°C. For EDFA, the length of erbium-doped fiber is 12.5 m, and the power of 1550 nm input signal is 1.5 mW. As a result, the power of pump LD is 330 mW, and the power uncertainty is 0.5%. The power of EDFA output at 1550 nm is 300 m W,and the power uncertainty is ± 3 mW.

关键词： erbium-doped fiber amplifier (EDFA) fiber sensor bidirectional pump, laser diodes (LDs) driver thermoelectric cooler (TEC)

Demodulation of the multi-peak fiber Bragg grating sensor based on partial wavelength scan

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Chinese Optics Letters 2020年第7期18卷 45-51页

作者： Pan Dai Yu Zhou Leilei Wang Shangjing Liu Xuping Zhang Xiangfei Chen Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education Institute of Optical Communication EngineeringNanjing UniversityNanjing 210093China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China

Until now, a high-efficiency demodulation method for fiber Bragg grating(FBG) sensors has been a *** this Letter, by employing multi-peak FBGs, an FBG sensor with a partial wavelength scan is proposed and initially demonstrated. By demodulating a near-symmetrical multi-peak FBG and an asymmetrical multi-peak FBG in the strain experiment, sensor sensitivities of 1.02 pm/με and 1.01 pm/με are measured for the interrogation system, respectively. The average demodulation deviations for the two sensors are 1.81% and 0.4%,respectively. The proposed method is expected to realize high-efficiency and low-cost FBG interrogators.

关键词： fiber Bragg grating fiber sensor multi-peak fiber Bragg grating

Long-term In Vivo Monitoring of Chemicals with fiber sensors

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Advanced fiber Materials 2021年第1期3卷 47-58页

作者： Jiajia Wang Liyuan Wang Jianyou Feng Chengqiang Tang Xuemei Sun Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Scienceand Laboratory of Advanced MaterialsFudan UniversityShanghai 200438China

Long-term in vivo monitoring of chemicals with implanted sensors has received considerable interests over the past decades owing to their significant contributions in reflecting health conditions and assistance in diagnosing ***,the widely explored chemical sensors outside the body fail to meet the requirements of in vivo *** perspective reviews main challenges,recent advances and future directions of long-term in vivo monitoring of chemicals,related to immune response and sensing *** in terms of the immune response caused by unstable interfaces between sensors and tissues and improper implanting methods,and the insufficient performance of chemical sensors in complex physiological environment are ***,recent advances in fabricating biocompatible,flexible and thin sensors,developing effective implanting methods with reduced injury and improving the sensitivity,selectivity and stability of chemical sensors for accurate monitoring in vivo are ***,we propose the future directions to address these challenges by fiber chemical sensors through the combination of soft fiber configuration,facile implanting methods and new recognition elements,which will provide new platforms for health monitoring and physiological mechanism revealing.

关键词： fiber sensor Long-term Chemical In vivo

Research on fiber-grating-based Wireless sensor Networks

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Photonic sensors 2012年第2期2卷 166-172页

作者： Bo LIU Jinjie CHEN Hao ZHANG Xiaoyi DONG Key Laboratory of Photoelectric Information Technical Science Ministry of Education Institute of Modern OpticsNankai University Tianjin 300071 China

A 20-node fiber-grating-based wireless sensor network is proposed and experimentally demonstrated. Each sensor node is integrated with the light source, 1-3 FBG sensing probes, wavelength demodulation, and wireless communication module. Via self-organized clusters and low energy adaptive clustering hierarchy （LEACH） route protocols, the sensor nodes are able to exchange sensing data with the control center, and the maximum communication radius of a sensor node is over 170m. The sensor node is battery-powered with a survival lifetime of up to 120 days at a network refresh rate of 5 minutes.

关键词： fiber sensor wireless sensor networks LEACH