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Encrypted optical fiber tag based on encoded fiber Bragg grating array 被引量:1
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作者 Zhihao Cai Bozhe Li +13 位作者 Zhiyong Bai Dejun Liu Kaiming Yang Bonan Liu Cong Zhao Mengqiang Zou Jie Zhou Shangben Jiang Jingyi Huang Li Liu Xuming Zhang Junle Qu Yiping Wang Changrui Liao 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2023年第3期658-665,共8页
Optical fibers are typically used in telecommunications services for data transmission,where the use of fiber tags is essential to distinguish between the different transmission fibers or channels and thus ensure the ... Optical fibers are typically used in telecommunications services for data transmission,where the use of fiber tags is essential to distinguish between the different transmission fibers or channels and thus ensure the working functionality of the communication system.Traditional physical entity marking methods for fiber labeling are bulky,easily confused,and,most importantly,the label information can be accessed easily by all potential users.This work proposes an encrypted optical fiber tag based on an encoded fiber Bragg grating(FBG)array that is fabricated using a point-by-point femtosecond laser pulse chain inscription method.Gratings with different resonant wavelengths and reflectivities are realized by adjusting the grating period and the refractive index modulations.It is demonstrated that a binary data sequence carried by a fiber tag can be inscribed into the fiber core in the form of an FBG array,and the tag data can be encrypted through appropriate design of the spatial distributions of the FBGs with various reflection wavelengths and reflectivities.The proposed fiber tag technology can be used for applications in port identification,encrypted data storage,and transmission in fiber networks. 展开更多
关键词 fiber bragg grating femtosecond laser micromachining encrypted information optical fiber tag
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Hollow and filled fiber bragg gratings in nano-bore optical fibers
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作者 Yong-Xin Zhang Sheng Liang +9 位作者 Qian-Qing Yu Zheng-Gang Lian Zi-Nian Dong Xuan Wang Yu-Qin Lin Yu-Qi Zou Kun Xing Liu-Yan Liang Xiao-Ting Zhao Li-Jing Tu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第7期279-285,共7页
To combine the technical functions and advantages of solid-core fiber Bragg gratings(FBGs) and hollow-core optical fibers(HCFs), the hollow and filled FBGs in nano-bore optical fibers(NBFs) with nano-bore in the GeO2-... To combine the technical functions and advantages of solid-core fiber Bragg gratings(FBGs) and hollow-core optical fibers(HCFs), the hollow and filled FBGs in nano-bore optical fibers(NBFs) with nano-bore in the GeO2-doped core are proposed.The fundamental mode field, effective mode index, and confinement loss of NBF with 50 nm–7 μm-diameter hollow and filled nano-bore are numerically investigated by the finite element method.The reflected spectra of FBGs in NBFs are obtained by the transmission matrix method.The hollow FBGs in NBFs can be acheived with ~5% power fraction in the bore and the ~0.9 reflectivity when bore diameter is less than 3 μm.The filled FBGs can be realized with^1% power fraction and 0.98 reflectivity with different fillings including o-xylene, trichloroethylene, and chloroform for 800-nm bore diameter.The feasibility of the index sensing by our proposed NBF FBG is also analyzed and discussed.The experimental fabrication of hollow and filled FBGs are discussed and can be achieved by current techniques.The aim of this work is to establish a principle prototype for investigating the HCFs and solid-core FBGs-based fiber-optic platforms,which are useful for applications such as the simultaneous chemical and physical sensing at the same position. 展开更多
关键词 nano-bore optical fiber fiber bragg grating(FBG) hollow-core optical fiber(HCF) fiber optics
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Optical fiber Bragg grating sensors in smart structures
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《大连理工大学学报》 EI CAS CSCD 北大核心 1997年第S2期76-76,共1页
OpticalfiberBragggratingsensorsinsmartstructuresWeichongDu1,2,WJin2,SHLiu1(1HongKongPolytechnicUniv.2SouthCh... OpticalfiberBragggratingsensorsinsmartstructuresWeichongDu1,2,WJin2,SHLiu1(1HongKongPolytechnicUniv.2SouthChinaNormalUniv.)Op... 展开更多
关键词 SMART optical fiber grating SENSORS bragg
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Characteristics of Smart Concrete with Fiber Optical Bragg Grating Sensor
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作者 信思金 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2004年第2期82-84,共3页
Based on the advantages of the fiber Bragg grating sensing technology,this paper presents a principle of a novel smart concrete with fiber optical Bragg grating sensor,analyses the theory and characteristics,illustrat... Based on the advantages of the fiber Bragg grating sensing technology,this paper presents a principle of a novel smart concrete with fiber optical Bragg grating sensor,analyses the theory and characteristics,illustrates the key technology and method to make the fiber Bragg grating sensor for the smart concrete,and proves the feasibility with experiments.The results indicate that the smart concrete with fiber Bragg grating sensors is feasible in the structure monitoring and damage diagnosing in the long run. 展开更多
关键词 smart concrete fiber optical bragg grating sensor intelligent materials
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Code synchronization based on lumped time-delay compensation scheme with a linearly chirped fiber Bragg grating in all-optical analog-to-digital conversion
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作者 王涛 康哲 +4 位作者 苑金辉 田野 颜玢玢 桑新柱 余重秀 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第10期180-185,共6页
We propose a novel lumped time-delay compensation scheme for all-optical analog-to-digital conversion based on soliton self-frequency shift and optical interconnection techniques. A linearly chirped fiber Bragg gratin... We propose a novel lumped time-delay compensation scheme for all-optical analog-to-digital conversion based on soliton self-frequency shift and optical interconnection techniques. A linearly chirped fiber Bragg grating is optimally designed and used to compensate for the entire time-delays of the quantized pulses precisely. Simulation results show that the compensated coding pulses are well synchronized with a time difference less than 3.3 ps, which can support a maximum sampling rate of 151.52 GSa/s. The proposed scheme can efficiently reduce the structure complexity and cost of all-optical analog-to-digital conversion compared to the previous schemes with multiple optical time-delay lines. 展开更多
关键词 all-optical analog-to-digital lumped time-delay compensation soliton self-frequency shift lin-early chirped fiber bragg grating
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Novel Apodized Fiber Bragg GratingApplied for Medical Sensors:Performance Investigation
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作者 Ramya Arumugam Ramamoorthy Kumar +3 位作者 Samiappan Dhanalakshmi Khin Wee Lai Lei Jiao Xiang Wu 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第4期301-323,共23页
Sensors play an important role in shaping and monitoring human health.Exploration of methods to use Fiber Bragg Grating(FBG)with enhanced sensitivity has attracted great interest in the field of medical research.In th... Sensors play an important role in shaping and monitoring human health.Exploration of methods to use Fiber Bragg Grating(FBG)with enhanced sensitivity has attracted great interest in the field of medical research.In this paper,a novel apodization function is proposed and performance evaluation and optimization of the same have been made.A comparison was conducted between various existing apodization functions and the proposed one based on optical characteristics and sensor parameters.The results evince the implementation of the proposed apodization function for vital sign measurement.The optical characteristics considered for evaluation are Peak Resonance Reflectivity level,Side Lobes Reflectivity level and FullWidth HalfMaximum(FWHM).The proposed novel apodization novel function has better FWHM,which is narrower than the FWHM of uniform FBG.Sensor characteristics like a quality parameter,detection accuracy and sensitivity also show improvement.The proposed novel apodization function is demonstrated to have a better shift in wavelength in terms of temperature and pulse measurement than the existing functions.The sensitivity of the proposed apodized function is enhanced with a Poly-dimethylsiloxane coating of varying thickness,which is 6 times and 5.14 times greater than uniform Fiber Bragg grating and FBG with the proposed novel apodization function,respectively,enhancing its utilization in the field of medicine. 展开更多
关键词 fiber bragg grating APODIZATION optical sensing TEMPERATURE STRAIN sensitivity
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Magneto-Optic Fiber Bragg Gratings with Application to High-Resolution Magnetic Field Sensors 被引量:4
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作者 Bao-Jian Wu Ying Yang Kun Qiu 《Journal of Electronic Science and Technology of China》 2008年第4期423-425,共3页
Magneto-optic fiber Bragg gratings (MFBG) based on magneto-optic materials have a lot of potential applications for sensing and optical signal processing. The transmission and reflection spectra of guided optical wa... Magneto-optic fiber Bragg gratings (MFBG) based on magneto-optic materials have a lot of potential applications for sensing and optical signal processing. The transmission and reflection spectra of guided optical waves in the MFBG are investigated. According to the sensitivity of MFBG spectral lines to the magneto-optic coupling intensity varying with applied magnetic field, a novel magnetic field sensor of high-resolution up to 0.01 nm/(kA/m) is predicted. 展开更多
关键词 Faraday effect fiber bragg grating magneto-optical sensor transmission spectra.
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A simulation program for analysing fiber optic Bragg gratings
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《大连理工大学学报》 EI CAS CSCD 北大核心 1997年第S2期76-76,共1页
AsimulationprogramforanalysingfiberopticBragggratingsPeterKCChan,W.Du,W.Jin,M.S.Demokan(Dept.ofElectr.Eng.,H... AsimulationprogramforanalysingfiberopticBragggratingsPeterKCChan,W.Du,W.Jin,M.S.Demokan(Dept.ofElectr.Eng.,HongKongPolytechni... 展开更多
关键词 PROGRAM SIMULATION fiber gratingS optic bragg analysing
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NOVEL FIBER GRATING SENSOR DEMODULATION TECHNIQUE BASED ON OPTICAL WAVELET FILTERING
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作者 WANG Yiqun WANG Haifang +2 位作者 ZHU Dandan QIAO Shuxin CAI Yanan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第1期134-136,共3页
The optical wavelet filter is designed. It can filter and choose frequency swiftly. It can realize demodulation of distributed fiber Bragg grating(FBG) measurement system. Its scanning resolution and scanning period... The optical wavelet filter is designed. It can filter and choose frequency swiftly. It can realize demodulation of distributed fiber Bragg grating(FBG) measurement system. Its scanning resolution and scanning period depend on wavelet function. Wavelet function is controlled by computer. Compared to conventional scan filter, optical wavelet filtering has some advantages such as simple structure, high scan frequency, high resolution and good linearity. At last, the error of optical wavelet filter scanning procedure is analyzed. Scanning step length refers to the shifting of optical wavelet window's central frequency. It affects system precision directly. If scanning step length is different, the measured signal is different. The methods of reducing step length guarantee scanning periodic time are presented. 展开更多
关键词 optical wavelet filtering fiber bragg grating (FBG) Demodulation Scanning step length
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Engineering approach to in-situ bridge health monitoring with fiber bragg gratings 被引量:3
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作者 武湛君 张博明 +2 位作者 万里冰 周智 欧进萍 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第5期588-594,共7页
In this presentation the feasibility and capability of fiber Bragg gratings (FBG) employed in bridge health monitoring are demonstrated on a real bridge. FBG' s wavelength shift depending on strain variance has bee... In this presentation the feasibility and capability of fiber Bragg gratings (FBG) employed in bridge health monitoring are demonstrated on a real bridge. FBG' s wavelength shift depending on strain variance has been tested. The technique of FBG installation on bridges has been developed. 12 FBG strain sensors and 3 temperature sensors have been successfully embedded in the prestressed concrete box girder during the construction of Heilongjiang Hulan River Bridge. The prestressing tension process and quasi-static loading process of the girder were monitored with those sensors before it was installed onto the bridge. After the bridge was completed, the FBG sensors embedded have been utilized to monitor the strain shift of the beam under quasi-static load, traffic load and temperature. The results show that the traffic fluxes, possible tatigue damage and deflection of the bridge can be revealed conveniently through strain measurements with these FBG sensors, which provide key information for structural health diagnosis. The fact that the FBG strain sensors have withstood the ordeal of harsh construction process and lasted for more than one year proves that their durability and stability can satisfy the requirements for bridge health monitoring. It is also shown that the FBG strain sensor is more adaptive to long-term structural health monitoring than the electric resistance strain gauge. 展开更多
关键词 fiber bragg gratings fiber optic sensors BRIDGE STRAIN structural health monitoring
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Cascaded tilted fiber Bragg grating for enhanced refractive index sensing 被引量:2
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作者 Biqiang Jiang Zhixuan Bi +4 位作者 Shouheng Wang Tell Xi Kaiming Zhou Lin Zhang Jianlin Zhao 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第11期257-261,共5页
We proposed and experimentally demonstrated a cascaded tilted fiber Bragg grating(TFBG)for enhanced refractive index sensing.The TFBG is UV-inscribed in series in ordinary single-mode fiber(SMF)and reduced-diameter SM... We proposed and experimentally demonstrated a cascaded tilted fiber Bragg grating(TFBG)for enhanced refractive index sensing.The TFBG is UV-inscribed in series in ordinary single-mode fiber(SMF)and reduced-diameter SMF with the same tilt angle,and then excites two sets of superposed spectral combs of cladding modes.The cascaded TFBG with total length of 18 mm has a much wider wavelength range over 100 nm and narrower wavelength separation than that of a TFBG only in the SMF,enabling an enlarged range and a higher accuracy of refractive index measurement.The fabricated TFBG with the merits of enhanced sensing capability and temperature self-calibration presents great potentials in the biochemical sensing applications. 展开更多
关键词 tilted fiber bragg grating fiber optics sensors refractive index measurement
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Interrogating a Fiber Bragg Grating Vibration Sensor by Narrow Line Width Light 被引量:5
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作者 Jun Chang Dian-Heng Huo Liang-Zhu Ma Xiao-Hui Liu Tong-Yu Liu Chang Wang 《Journal of Electronic Science and Technology of China》 2008年第4期486-488,共3页
A method to interrogate fiber Bragg grating vibration sensor by narrow line width light is demonstrated. The interrogation scheme takes advantage of the intensity modulation of narrow spectral bandwidth light, such as... A method to interrogate fiber Bragg grating vibration sensor by narrow line width light is demonstrated. The interrogation scheme takes advantage of the intensity modulation of narrow spectral bandwidth light, such as distributed feedback laser, when a reflection or transmission spectrum curve of an fiber Bragg grating (FBG) moves due to the strain which is applied on the sensor. The sensor's response to accelerating frequency and amplitude is measured by experiment. The factors which have impacts on the sensitivity of the interrogation system are also discussed. 展开更多
关键词 fiber bragg grating (FBG) interrogation fiber bragg grating sensor optical fiber vibration sensor.
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Fiber Bragg Gratings in Small-Core Ge-Doped Photonic Crystal Fibers 被引量:1
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作者 Yiping Wang Hartmut Bartelt +5 位作者 Wolfgang Ecke Reinhardt Willsch Jens Kobelke Michael Kautz Sven Brueckner Mantled Rothhardt 《Journal of Electronic Science and Technology of China》 2008年第4期429-433,共5页
This paper reports fiber Bragg gratings (FBGs) inscribed in a small-core Ge-doped photonic crystal fibers with a UV laser and a Talbot interferometer. The responses of such FBGs to temper- ature, strain, bending, an... This paper reports fiber Bragg gratings (FBGs) inscribed in a small-core Ge-doped photonic crystal fibers with a UV laser and a Talbot interferometer. The responses of such FBGs to temper- ature, strain, bending, and transverse-loading were systematically investigated. The Bragg wavelength of the FBGs shifts toward longer wavelengths with increasing temperature, tensile strain, and transverse-loading. The bending and transverse- loading properties of the FBGs are sensitive to the fiber orientations. 展开更多
关键词 fiber bragg gratings photonic crystal fibers optical fiber sensors.
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Tunable Super-Structured Fiber Bragg Gratings with Perfect Sequences Based on m-Sequence
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作者 Joao S.Pereira Marco P.M.Ferreira Marko Gasparovic 《Journal of Electronic Science and Technology》 CAS CSCD 2017年第4期358-363,共6页
Recently, a tunable fiber Bragg grating(FBG) was developed by using stress-responsive colloidal crystals. In this paper, we have simulated the application of these nanoparticles into the super-structured fiber Bragg g... Recently, a tunable fiber Bragg grating(FBG) was developed by using stress-responsive colloidal crystals. In this paper, we have simulated the application of these nanoparticles into the super-structured fiber Bragg grating(SSFBG) written with perfect sequences derived from a short maximal-length sequence. A tunable SSFBG will be available to overcome the prohibitive temperature variation of the optical codecs. Nevertheless,we presented a method to implement coherent time spreading optical code-division multiple-access(OCDMA) where a unique code(or perfect sequence) can be reused and mixed with different wavelengths to obtain a tunable wavelength-division multiplexing(WDM)system. In order to maximize the binary throughput, we have selected a unique short maximal-length sequence composed of 7 chips that can be tuned with 7 different optical wavelengths. We found thousands of different tunable combinations that presented power contrast ratios(P/C) higher than 12 dB. When a WDM-OCDMA system used 2 different combinations simultaneously, the perfect binary detection with error correction codes was achieved successfully. The tunable SSFBG with colloidal crystals will be a simple and good alternative choice for fiber-to-the-home(FTTH) communications. 展开更多
关键词 optical code-division multiple-access(OCDMA) super-structured fiber bragg grating(SSFBG) wavelength-division multiplexing OCDMA(WDM-OCDMA)
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Fabrication of High Quality Broadband Type IIA Chirped Fiber Bragg Gratings
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作者 SANG Xin-zhu YU Chong-xiu +2 位作者 YAN Bin-bin MA Jian-xin LU Nai-guang 《Semiconductor Photonics and Technology》 CAS 2006年第4期238-241,共4页
Chirped fiber Bragg gratings have found many applications in optical communication and sensing systems. High quality filters based on chirped fiber Bragg gratings with reflection bandwidth of 2.6 and 32nm and high ref... Chirped fiber Bragg gratings have found many applications in optical communication and sensing systems. High quality filters based on chirped fiber Bragg gratings with reflection bandwidth of 2.6 and 32nm and high reflectivity are demonstrated experimentally with 2 and 4cm long phase masks, respectively. These filters with flat reflection band and high reflectivity are achieved by writing type IIA chirped Bragg gratings. 展开更多
关键词 optical fiber fiber bragg grating optical communication optical fiber sensor
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Characteristics of Bragg Gratings in All-Solid Photonic Bandgap Fiber
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作者 Bai-Ou Guan Zhi Wang +1 位作者 Yang Zhang Da Chen 《Journal of Electronic Science and Technology of China》 2008年第4期438-441,共4页
We report on fiber Bragg gratings in all-solid photonie bandgap fiber that was composed of a triangular array of high-index Ge-doped rods in pure silica background with fluorine-doped index-depressed layer surrounding... We report on fiber Bragg gratings in all-solid photonie bandgap fiber that was composed of a triangular array of high-index Ge-doped rods in pure silica background with fluorine-doped index-depressed layer surrounding the Ge-doped rod. Fiber Bragg gratings were photowritten with 193 nm ArF excimer laser and characterized for their response to strain, temperature, bending, and torsion. These gratings couple light from the forward core mode to not only backward core mode but also backward rod modes. This results in multiple resonance peaks in the reflection spectrum. All resonance wavelengths exhibited the same temperature and strain response with coefficient similar to that of Bragg gratings in standard single-mode fiber. The strength of the resonance peaks corresponding to the backward rod modes showed high sensitivity to bending and torsion. 展开更多
关键词 fiber bragg gratings fiber optic sensors microstructured optic fibers photonic bandgap fibers.
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A Novel Temperature-Compensated, Intensity-Modulated Fiber Bragg Grating Sensor System
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作者 Xin-Yong Dong Hwa-Yaw Tam 《Journal of Electronic Science and Technology of China》 2008年第4期434-437,共4页
An intensity-modulated, fiber Bragg grating (FBG) sensor system based on radio-frequency (RF) signal measurement is presented. The RF signal is generated at a photodetector by two modulated optical signals reflect... An intensity-modulated, fiber Bragg grating (FBG) sensor system based on radio-frequency (RF) signal measurement is presented. The RF signal is generated at a photodetector by two modulated optical signals reflected from the sensing FBG and a reference one. Bragg wavelength shift of the sensing FBG changes intensity of the RF signal by changing phase difference between the two optical signals, with temperature effect being compensated automatically by the reference FBG, Strain measurement with a maximum sensitivity of -0.34 μV/με has been achieved. 展开更多
关键词 optical fiber sensing fiber bragg gratings INTENSITY-MODULATED strain.
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Pure Bending Characteristic of Tilted Fiber Bragg Grating
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作者 Bo Liu Yin-Ping Miao Hai-Bin Zhou Qi-Da Zhao 《Journal of Electronic Science and Technology of China》 2008年第4期470-473,共4页
a novel structure of the pure macro- bending sensor based on the tilted fiber Bragg grating (TFBG) is proposed. The TFBG located in the half circle with the different diameters is bent at a constant angle with respe... a novel structure of the pure macro- bending sensor based on the tilted fiber Bragg grating (TFBG) is proposed. The TFBG located in the half circle with the different diameters is bent at a constant angle with respect to the tilted grating planes. With the variations of the curvature, the core-mode resonance is unchanged and the transmission power of cladding modes detected by the photodiodes varies linearly with curvature, while the ghost mode changes by the form of two-order polynomial. So we can use the transmission power of ghost mode or other cladding modes to detect bending curvature as shape sensor. From a practical point of view, the sensor proposed here is simple, low cost and easy to implement. Moreover, it is possible to make a temperature-insensitive shape sensor due to the same temperature characteristic between the core mode and the cladding modes. 展开更多
关键词 Half circle optical fiber sensing purebending sensor tilted fiber bragg grating.
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Birefringent Bragg Gratings in Highly-Nonlinear Photonic Crystal Fiber
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作者 Kevin. Cook John. Canning John. Holdswowth 《Journal of Electronic Science and Technology of China》 2008年第4期426-428,共3页
Efficient writing of Bragg gratings in 12-ring highly-nonlinear photonie crystal fibers is described. Experimental and numerical investigations are performed to reveal the optimum angle for coupling UV writing light t... Efficient writing of Bragg gratings in 12-ring highly-nonlinear photonie crystal fibers is described. Experimental and numerical investigations are performed to reveal the optimum angle for coupling UV writing light to the core. Furthermore, we show that the formation of a strongly briefringent grating is at a particular angle of orientation. 展开更多
关键词 bragg gratings fiber optics photonic crystal fiber.
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Cladding Modified Fiber Bragg Grating for Copper Ions Detection
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作者 Husam Abduldaem Mohammed Aqiel Almamori Ali A.Alwahib 《Semiconductor Science and Information Devices》 2021年第2期12-16,共5页
This paper reports a fiber Bragg grating(FBG)as a biosensor.The FBGs were etched using a chemical agent,namely,hydrofluoric acid(HF).This implies the removal of some part of the cladding layer.Consequently,the evanesc... This paper reports a fiber Bragg grating(FBG)as a biosensor.The FBGs were etched using a chemical agent,namely,hydrofluoric acid(HF).This implies the removal of some part of the cladding layer.Consequently,the evanescent field propagating out of the core will be closer to the environ­ment and become more sensitive to the change in the surrounding.The proposed FBG sensor was utilized to detect toxic heavy metal ions aqueous medium namely,copper ions(Cu^(2+)).Two FBG sensors were etched with 20 and 40μm diameters and fabricated.The sensors were studied towards Cu^(2+)with different concentrations using wavelength shift as a result of the interaction between the evanescent field and copper ions.The FBG sensors showed a good response in terms of significant wavelength shift in corresponding to varying Cu2+concentrations when immersed in aqueous mediums.The sensors exhibited excellent repeatability towards Cu ions.The results demonstrate that the smaller FBG etching diameter,the better optical response in terms of wavelength and linearity. 展开更多
关键词 fiber bragg grating optical fiber sensors Etched fiber C-BAND D-heavy metals
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