共查询到20条相似文献,搜索用时 78 毫秒
1.
1IntroductionUsingdispersioncompensatingtechniquestoupgradetheexistingnondispersionshiftedfiber(NDSF)telecommunicationsystemi... 相似文献
2.
Soliton Transmission Research on using Dispersion Step Fiber Chain Instead of Soliton Fiber 总被引:1,自引:0,他引:1
YU Jianjun YANG Bojun GUAN KejianYANG Qimin ZHANG Xiaoguan 《Chinese Journal of Lasers》1997,6(3):262-268
SolitonTransmisionResearchonusingDispersionStepFiberChainInsteadofSolitonFiberYUJianjunYANGBojun+GUANKejianYANGQiminZHANGXia... 相似文献
3.
Abstract This article presents a theoretical study of the dispersion properties of the asymmetrically apodized fiber Bragg gratings. It is shown that the dispersive behavior of these gratings may be changed from normal to anomalous, depending on the apodization function and the grating strength. The asymmetrical Bessel functions were chosen in order to demonstrate these properties of the gratings. The application of this effect in a dispersion-less Fabry-Pérot fiber cavity formed by two asymmetrically apodized fiber Bragg gratings is discussed. 相似文献
4.
YUAN Zongheng LIU Yongzhi 《Chinese Journal of Lasers》1998,7(5):390-394
1IntroductionNarowlinewidthtunablesinglefrequencysemiconductorlasersarenedforapplicationsincoherentcommunication,coherentde... 相似文献
5.
A fiber taper can evanescently couple to whispering gallery modes (WGMs) in a planar silica microdisk for observing the optical properties of the microdisk cavity.It is revealed that WGMs have very high quality (Q) factors by controlling the air gap between the taper and the microdisk.The best coupling efficiency from the taper to the microdisk is as high as 98%,and can be continuously adjusted from the under-coupling,critical-coupling to over-coupling regimes.The influence of the laboratory circumstance such as surface contamination on the microdisk is also discussed.It is experimentally shown that the high-Q-factor (10~5) modes can be kept for a long period in a general laboratory circumstance. 相似文献
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1 Introduction Anongoingchallengeintheopticalcommunicationsistomaximisethedatatransmissioncapacityofasinglefiber.TheintroductionofmultiplechannelsthroughDenseWavelengthDivisionMultiplexing(DWDM )systemshasgreatlyimprovedthiscapacity ,becauseofthesteady… 相似文献
7.
1 Introduction Long periodfiber gratings (LPGs )recentlyattractedmuchattentionforuseinopticalsensingapplications[1,2 ] .Theyareusedassensingcomponentstomeasuretemperature ,strainandbendingoffiber .However ,minimizingthecrosstalkbetweendifferentmeasurands,espec… 相似文献
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Reccntly,thec]9ctrol13:lgrlcticProPcl'ticsinn0nIinearpcriodicstructurchavebcenexten-sively8tudiedW.ChenandD.L.A/[illsdeIn0nstratedthecxisting0fs0-cal1cdgaps0litoninnon1inearpcri0dicstructure[1J,thcsegapsolit0nsarespatiaIs0lit0ns.'Latterstudiesshowedthatthegaps0litonis0nlyakind0fspecialcflsc0fBraggs0Iiton\\'hichcanm0vewithanyve-locitybelox\'t[1egroLlpvcI0city[2,3j.Thcse.solit0nscxistinthcresonantcase,i-e-,thestr0ngcouplingbctxvcentt1cfor\\':lI'<1112odcanLIthcback\\'ardm0dc.Inthiscasc,the… 相似文献
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WANG Zhong HONG Haitao XIAO Hai SUN Changku MENG Yan YE Shenghua 《Chinese Journal of Lasers》1997,6(5):435-440
1.IntroductionAbsolutedistancemeasurementisfarfromanewtopic.However,itisstillafieldstimulatinggreatinterestsnowadaysduetoitSimportantroleinmanufacturingandassembly['J.SincethegreatsuccessachievedbyMichelsonandBenoitwhentheyfirstdevelopedaninterferometertodeterminethestandardmeterintermsofthemonochromaticredcadmiumline,theopticinterferometerhasbeenprovedtobeoneofthemostpreciseandefficientwayindisplacementmeasurementbecauseofitshighdiscriminationandsimplestructure.However,thetraditionalinterfe… 相似文献
10.
《中国光学快报(英文版)》2008,(9)
A fiber Bragg grating(FBG)hydrophone with high sensitivity was demonstrated.This hydrophone used a rubber diaphragm and a copper hard core as the sensing element.To compensate the hydrostatic pressure, a capillary tube was fixed at the end of the hydrophone.Theoretical analysis of the acoustic pressure sensitivity was given in this letter.Experiments were carried out to test the frequency response of the hydrophone.The result shows that when the Young's modulus of the diaphragm is higher,a flatter frequency response will be obtained. 相似文献
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StudyOnLaserFiberDiameterMeasurementInstrument¥ZHOUGe;LIUZeyi;LIHeqiao;MAOYi;ZHANGYimo(InstituteofOptoelectronic&PrecisionEng... 相似文献
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SupportedinpartbyWangKuanChenEductionFoundationofAcademiaSinicaandExchangePlanofAcademiaSinicaandAustralianResearchCouncil,andpartsupportedbyNationalNaturalScienceFoundationofChina.1.IntroductionInthefamilyoftheconfocalscanningmicrosc0pe(CSM),thereappearsanewmemberrecently,thatisfibcr-0pticalCSM[1'2j.Inthispaperweusesingle-m0defiberdirectionalcou-pler(3dB)andgradicnt-index-r0dlenscs(GRlN)t0constructapure0ptical-fiberconfocalscanningmicroscope.Inthatfo1lo\vsx`ediscusstheimageformati… 相似文献
13.
The transmission spectra of multiply π phase-shifted long-period fiber gratings (LPFG's) are analyzed by a combination of coupled-mode theory and the fundamental matrix method. The theoretical simulation shows that the LPFG' s can act as novel bandpass filters with two dominant passbands when multiple π phase-shifts are introduced at particular locations along the grating. 相似文献
14.
NovelSchemeforNarrowBandFiberFilterSystemZHAOYucheng;JIANShuisheng;WANGWei;TIANWenqiang(NorthernJiaotongUnviversity,Institute... 相似文献
15.
WANG Zhaobing LIAO Yanbiao 《Chinese Journal of Lasers》1998,7(6):485-490
1IntroductionInthelastfewyears,curentandvoltagemeasurementsystemsbasedonopticaldeviceshavebeendeveloped.Anumberofquitediferen... 相似文献
16.
Narrow Linewidth Tm^3+-Doped Large Core Fiber Laser Based on a Femtosecond Written Fiber Bragg Grating
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A diode laser (LD) clad-pumped narrow linewidth all-fiber Tm^3+-doped fiber laser is reported with a maximal output power of 27W at 1.947μm. By successively splicing an LD pigtail fiber, a single-mode Tm^3+-doped fiber, and a multi-mode Tm^3+-doped fiber, the fiber laser has 70pm narrow linewidth output, and a high slope efficiency of nearly 47.5% with respect to the launched pump power. The high reflectivity fiber Bragg gratings, which are directly written into the single-mode Tm^3+-doped fiber core by the 800nm femtosecond pulsed laser, act as the high reflectivity coupler. The output laser has diffraction-limited beam quality with a factor M^2 of 1.29, when the output laser power is nearly 27W. 相似文献
17.
《中国光学快报(英文版)》2007,(9)
A novel fiber Bragg grating(FBG)pressure sensor with the enhanced sensitivity has been demonstrated.A piston-like diaphragm with a hard core in the center is used to enhance the sensitivity.Both the theoretical analysis and the experimental result show that the radius of the hard core has significant effect on the pressure sensitivity.When the radius of the hard core is 1.5 ram,a pressure sensitivity of 7.23 nm/MPa has been achieved. 相似文献
18.
JIN Xiaofeng 《Chinese Journal of Lasers》1998,7(5):464-470
1IntroductionInterconnectionsofopticalwaveguidecomponentswithdiferentmodalspotsizes,particularlyfortheconnectionof(1)lasersou... 相似文献
19.
JIANG Chun ZENG Qingji 《Chinese Journal of Lasers》2002,11(3):223-227
1 Introduction Wavelength divisionmultiplexing(WDM )methodgivesasolutionofdemandonthehighspeedandhighcapacitytransmission .OneofthekeytechnologyoftheWDMtransmissionistobroadenbandwidthoferbium dopedfiberamplifier (EDFA)andtogetthewidebandandflat gainEDFA .… 相似文献
20.
CHEN Genxiang JIAN Shuisheng GE Huang YANG Ling LI Xun WANG Wei 《Chinese Journal of Lasers》1997,6(2):185-188
l.IntroductionFibergratingshaveattractedanincreasingamountofattentionsineeG.Meltz[1Jandhisco-workersfirstdemonstratedinl989thatPermanentgratingscouldbewrittenbyex-peinganoPticalfiberfromthesidetotwointerferingbeamsofultraviolet(UV)light.Inrecentyears,avastresearchefforthasbeendevotedtoopticalfiberBragggratingsallovertheworld.Theirsimplicity,usefu1nesscoupledtotheiruniqueproPertiesandnu-merousadvantagesmakethemidealforawiderangeofimPOrtantapplicationsinopticalfibertelecommunications,lasersa… 相似文献