共查询到20条相似文献，搜索用时 15 毫秒
1.
In recent years ,the demand of the project survey grewincreasingly,sothetorsionsensor has obtainedextensiveattention.But the related studies about optical fiber tor-sionsensor are veryfewinthe domestic andforeign[1-3].Inthe traditional torsion sensor we p… 相似文献
2.
WANG Lin YAN Feng-ping LI Yi-fan GONG Tao-rong JIAN Shui-sheng 《光电子快报》2006,2(6):430-432
With the rapid development of fiber communicationsystem,fiber Bragg gratings (FBG) especially linear-chirped FBGis widely appliedtothe fiber compensationby its character of linear delay[1-2].However ,the per-formance is degraded because of reflectivity an… 相似文献
3.
A new type of high-power broadband superfluorescent source of Yb^3＋ -doped double-cladding photonic crystal fiber is reported experimentally, which is pumped at 976 nm by a high-power laser diode with the end-coupling method. We have obtained a smooth broadband output of superfluorescence The maximum output power is 1.649 W with a slope efficiency of 56.7%. The 3 dB bandwidth is 22.4 nm To the best of our knowledge, this is the first report about SFS with such high output power of 1.649 W. 相似文献
4.
WANG Chun-can ZHANG Fan TONG Zhi NING Ti-gang JIAN Shui-sheng 《光电子快报》2006,2(4):249-251
High-power ytterbium-doped fiber laser has attractedmuch attention recently in commercial and military ap-plications due to its high efficiency,compactness andhigh beam quality.In kilowatt power domain,the heatdissipation will play an i mportant role and … 相似文献
5.
ZHANG Tian-hao JIA Feng WANG Shun-li MAN Jiang-wei NIU Kai WANG Xu-cheng YANG Jia 《光电子快报》2006,2(6):406-407
Generally,there are two kinds of modulator used inthefiber system.Oneis electro-optic modulator based onthe change of guided modes in plane waveguides .Theother oneis electro-absorbingsemiconductor diode mod-ulator with internal structure si milar to the … 相似文献
6.
Fiber Bragg grating (FBG) technology has been de-veloped rapidlyinrecent years ,and has beenextensivelystudied in today′s optical communication and sensingsystems . Because of the linearity between the Braggwavelength and outside environmental parameters ,theaxial strain response of FBGhas been fullyinvestigatedand usedin measurement for strain,pressure,andther-mal expansion coefficient etc . By contrast ,fewstudieshave been carried out onthe transverseload response ofFBG[1-3].Gafsi and … 相似文献
7.
Fiber Bragg grating (FBG)[1]is one of the most i m-portant optical passive components in recent decades .The center wavelength tuning of fiber Bragg grating isof i mportant valueinthe fields of the fiber communica-tion andthe fiber sensing[2-7].The research of FBGcen-ter wavelengthtuningis concentrated onits practicality,si mplicity and high sensitivity.In the paper[8],a shift ofcenter wavelength upto 5 .02 nmcan be aroused underthelongitudinal force of 3 .60 Newton withthe sensitivi-ty ab… 相似文献
8.
Highperformancepolarization maintainingfibers (PMFs)havepotentialforanumberofapplicationssuchashighbitratecommunicationsystem,PMfibre loopsforgyroscopesandsoon.Theindex guidingPCFs arecharacterizedbyaseriesofholesrunningthroughou thelengthofthefiberarrangedinamicroscalestructurearoundahighindexcore.Thisoffersanewpossibilityto createhighbirefringenceintheindex guidingPCFs,be causethestack and drawprocessallowstheformationoftherequiredsymmetricorasymmetricmicrostructure andtheindexcontrasto… 相似文献
9.
Li-xun Zhang Yun Liao Zhi-yong Dai Zhong-hua Ou Yong-zhi Liu Zeng-shou Peng 《光电子快报》2006,2(5):345-347
The optical fiber temperature sensoris one of the dis-tributed measurement apparatus applied to the smartstructures of civil and military engineering.In the dis-tributedfiber Ramantemperature sensor ,the anti-Stokesand Stokes scattering radiation is sensi… 相似文献
10.
ZHANG Wei-gang WU Zhi-gang LIU Yan-ge YANG Yi-fei KAI Gui-yun ZHAO Qi-da YUAN Shu-zhong DONG Xiao-yi LI En-bang XI Jiang-tao Joe Chicharo 《光电子快报》2005,1(1):5-9
FiberBragggrating(FBG)isasignificanttechnology thatisusedtodesignkeydevicesorcomponentsinthesystemsoffibercommunicationandfibersensing[1], suchastunablefiberlasers[2],WDW/DM[3],WADM[4],tunablefiberfilter[5],fiberdispersioncom pensation[6],gainflattingofEDFA[7],FBG typeinter ferometer[8]andfibergratingsensors[9,10].OneofthekeyresearchissuesonFBGdevicesistomakethetun ingwavelengthdeviceswhichhavegoodcharacteristics ofwidetunablewavelengthrange,stableoutput,goodmultiplexingcapability. … 相似文献
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12.
WANG Hong-liang QIAO Xue-guang ZHOU Hong SHAO Min WEI Ting LIU Ying-gang LI Ting 《光电子快报》2005,1(2):103-106
No matter designing and manufacturing a FBG pres-sure sensor ,or monitoringthe strain on material surfaceby using FBGas a pressure sensor ,the difficult technicalproblems to be solved are as follows :first ,howto effec-tively couple and propagatethe external stresstothe ax-ial direction of FBGthrough the underlay material ;sec-ond,howto make the FBGpressure sensor achieving aneffect of enhancing sensitivity;third,how to ensure alinear relationship between FBG′s reflection wavelengthand t… 相似文献
13.
A theoretical model is developed for the laser-diode-pumped Tm3+-doped fiber amplifier, and a set of ordinary differential equations (ODEs) governing the dynamics of dual-wavelength pumping scheme (1.4μ+1.56μ) based on the rate equations and propagation equations was established. The relationship between the spectra gain and pump power was described and analyzed by numerically solving the ODEs. Spectral gain as a function of longitudinal position along the fiber was given to optimize the fiber length; spectral gain per unit length, and fractional inversion were used to explain the gain shift property of TDFA. The theoretical results agree well with the experimental data. Received 28 March Supported by China Scholarship Council, Natural Science Foundation of Shandong Province of China (grant no. Y2003G01 and Y2002G06), Research Fund for the Doctoral Program of Higher Education of China (grant no. 2002022048 相似文献
14.
LIU Jian-hui JIN Ming-di GE Chun-feng LI Shi-chen 《光电子快报》2006,2(1):24-26
We present a novel and efficient L-band wavelength-tunable Er^3＋ doped fiber laser of ring structure. In the cavity two segments of Er^3＋ doped fiber and a fiber Bragg grating are used to improve pump efficiency. Tunable filters based on fiber loop mirrors are also applied inside the cavity to act as both a wavelength selector and a line-width compressor. Using these techniques, a tunable laser with tuning range up to 42 nm, output power larger than 1 mW, power uniformity controlled within 1.75 dB and side mode suppression ratio about 40 dB is achieved. 相似文献
15.
A wavelength multiplexer or demultiplexer plays ani mportant role in all wavelength division multiplexing( WDM) system.Silica-basedarrayed waveguide gratings(AWGs) offer attractive featuresinthis area due to theadvantage of large output channels and lowlo… 相似文献
16.
Microstructure fiber ( MF) hasin recent years attrac-ted much scientific and technical interest . MF has arange of unique optical characteristics[1-3],such as singlemode guidance at all wavelengths ,fibers withanomalousdispersioninthe visible spectrum,and… 相似文献
17.
CHEN Ji-xin SUI Zhan CHEN Fu-shen LI Ming-zhong WANG Jian-jun 《光电子快报》2005,1(3):172-174
Recently,double clad fiber lasers with an output ofkilo-watt power have been reported[1].Thermal prob-lems such as thermal stressinducedfracture,decreasingof quantumefficiency andthermal lens effect are seriousinthis kind of high powerfiberlaser[2].In1995 ,fluores-cence cooling in Yb doped ZBLANP(ZrF4-BaF2-LaF3-AlF3-NaF-PbF2) glass was realizedfor thefirst ti me[3].Consequently,a section of Yb doped ZBLANP glass fi-ber laser was cooled from298 Kto 282 Kin the vacu-um[4].According t… 相似文献
18.
A type of combined optical fiber interferometric acoustic emission sensor is proposed. The sensor can be independent on the laser source and make light interference by matching the lengths of two arms, so it can be used to monitor the health of large structure. Theoretical analyses indicate that the system can be equivalent to the Michelson interferometer with two optical fiber loop reflectors, and its sensitivity has been remarkably increased because of the decrease of the losses of light energy. PZT is powered by DC regulator to control the operating point of the system, so the system can accurately detect feeble vibration which is generated by ultrasonic waves propagating on the surface of solid. The amplitude and the fre- quency of feeble vibration signal are obtained by detecting the output light intensity of interferometer and using Fourier transform technique. The results indicate that the system can be used to detect the acoustic emission signals by the fre-quency characteristics. 相似文献
19.
A fiber Bragg grating （FBG） high-temperature and high pressure sensor has been designed and fabricated by using the Al2O3 thin-wall tube as a substrate. The test results show that the sensor can withstand a pressure range of 0-45 MPa and a temperature range of-10-300 ℃, and has a pressure sensitivity of 0.0426 nm/MPa and a temperature sensitivity of 0.0112 nm/℃ 相似文献
20.
A kind of electric circuit is improved to optimize the linearity of edge filter demodulators in FBG .By using a logarithm amplifier and an extraction operation, the linear range of optimized edge filter demodulators has been broadened effectively, and the requirement of optical filter＇s linear range has been reduced. Theoretical analyses and the simulation results indi-cated that the linear range of optimized edge fdter demodulator＇s covers the whole transition region of the edge filter, while a strict linearity of the optical filter is not necessary. 相似文献