网络工程外文翻译中英文什么叫光纤与光纤应用领域.docx

网络工程外文翻译中英文什么叫光纤与光纤应用领域.docx

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网络工程外文翻译中英文什么叫光纤与光纤应用领域

郑州轻工业学院

本科毕业设计（论文）

——英文翻译

题目什么叫光纤与光纤应用领域

学生姓名

专业班级网络工程

学号*

院（系）计算机与通信工程学院

指导教师（职称）（讲师

完成时间2011年6月6日

英文原文

Whatisfiberandfiberopticapplications

Understandingtheopticalfiber,wefirsttakealookatthepropagationoflight.Justastraightline,butwhenthelightexposuretoasubstaneeoccurswhentherefractionandreflection.Weoftenseetheglassandmirrors,"reflective"referstothereflectionoflight;halfofthestraightstickintothecupisnoIongerastraightlookisanillusioncausedbylightrefraction.Infact,wehavebeenabletoseeavarietyofobjects,thatarecausedbyrefractionandreflectionoflight（ifthereisnolight,wecouldnotseeanything.）Propagationoflightinavacuumcanalsobespreadincertainsubstances,certainsubstancesmentionedhere,iscalledintheopticalmediaormediumterms.Glass,quartz,air,water,clearplasticsothelightcanbetransmitted,theyarethemediumoflighttransmission.Differentmediumdensityisnotthesame,suchasweknowthedensityofwaterismuchlargerthantheair.Seeminglysimilarsubstances（suchasglassandquartz）,andtheirdensityisnotthesame.So,isdividedinto"lightdensermedium"and"lightsparsemedia."Whenthelightfromonemediumwillbeinjectedintoanothermediumrefraction,liketurningthelightchildfriends.Evenwiththesamematerial,alsoproducedbysomeofthedensityofdifferentenvironmentalconditions,suchastheairsomewherehot（lowdensity）,somewhereinthecoldair（highdensity）,thelightpassingthroughhotandcoldaircanalsooccurwhentherefraction（Wearefamiliarwiththemirageisaresultofthissituationoccurs.）Shinethelightonthemediumsurfaceiscalledincident,refractedthroughthemediumoflightiscalledrefractionoflight.Incident,reflectedlightandmediuminterface（phasetwomediawhere）thereisarelationshipbetween,thisistheangleofincidenceandrefraction.Twopointsofviewangleastheincidentlightchanges.Whenthelightfromtheopticaldensermediuminjectedintothemediumanglelightthinningtoacertainextent,thelightcannoIongerlaunchedintoanothermedium,sowillhaveatotalreflectionoflight.

Understandingthepropagationoflight,letusknowfiber.Isasimpleglassfibercanbe,accordingtodifferentrequirements,itcanbemadeverythin,usuallyfromafewmicronstohundredsofmicrons.Alotoffiberwillusuallyincreaseinthesurface（coating）layerofanothermaterial,calledcladdingorcoatinglayer.Thislayerofmaterialcanbeusedasthemediumfromtherefractionoflightthinning,andsomeflexibilitycanenhancetheopticalfibersothatitcanbebent.Nofibercoatinglayeriscalledbarefiber.Barefibercanalsobetransmittedopticalsignal（opticalfiberandthentheairbecametwodifferentmedia.）Dependingontheneedsofpeopleinglassorquartzotherchemicalelementscanbeadded,youcanuseavarietyofcomplextechnologytomakethinfiberswithacomplexinternalstructure.Therefore,thefiberisalotofvarieties,andsomecansendthousandsofdifferenttypesoflightwaves,whileothersonlybyasinglewaveoflight.Fiberproductionprocessisrelativelyfine,usuallycalledthedrawing.Opticalfibercommunicationscableusedintherootbythetenstohundredsofsuchintegratedopticalfiber,eachfibercantakeahugetraffic.

Therefore,infiberopticaltransmission,mainlythecommoncoreandthecladdingeffect.Refractionoflightaccordingtotheabovementionedreason,wewillunderstandthatthefibercore,anditiscertainlyoutsideofthecladdingmaterialoftwodifferentdensities,andthecoredensityshouldbelargerthanthepacketlayer.Thus,aslongasasuitableangleofincominglight,thisbeamoflightwillbekeptintotalreflectionwithinthefibertotransmittotheotherend.

Practicalapplicationofopticalfiber,aslongasnottoobent,thelightwillenterthefiberwithinthefiberbouncesbackandforth,twistsandturnsforwardpropagation,butalsosomelightintothecladdingandinitsdissemination.Thepropagationoflightinfiberwillalsoinspireacertainwavemode,whichrelatedwiththethicknessofthefiber,corediameteristoosmalltodeterminethetransmissionmodeisdifficulttoform,thecorediameteristoothicktoanincreaseintransmissionmode,thedispersionofaserious,solidThefibercorecannotbetoothickortoothin,generallytransmittedseveraltimestoseveraltimesthewavelength.Inaccordaneewiththeopticalfibertoallowtransmissionofelectromagneticwavesonthemode,canbedividedintosingle-modeopticalfiberandmultimodefiber.Single-modefiberthatcantransmitanelectromagneticwavemode,multimodefiberthatcantransmitmultiplewavemodes,infact,single-modefiberandmultimodeopticalfiberofthepoints,thatis,thediameterofthecorepoints.Smallsingle-modefiber,multimodefiberthick.Usedinfiberopticcablenetworksareallsingle-modefiber,itstransmissioncharacteristics,andbandwidthofupto10GHZ,canbetransmittedinanopticalfiber60PAL-DTVsets.

Wehaveapreliminaryunderstandingoftheprinciplesoffiberoptictransmissionoflight,thenitisalsohowavarietyoftext,images,soundtransmissionfrom?

Itturnedoutthattheuseofelectronictechnology,peoplecanbetext,images,soundandotherinformationintoelectronicsignals,makingthemallintothe"1"and"0"digitstringconsistingof,thatiswhatweoftencalla"digitaltechnology".Indigitaltechnology,the1and0,saidcircuitforopeningandclosing,theuseoftheopticaltechnology,thebrightanddullthattheycanachievetwostates.So,peoplethroughOptical（fiberinputtotheopticalsignaldevice）toissueaseriesoflightanddarkfiberdifferentlightsignal,opticalfiberreceivestheotherendoftheopticalsignal,thenthroughthespecializedequipmenttorestoreitintoadigitalsignal,Finally,fromTV,radio,computersandotherdigitalsignalwillbereducedtotext,images,soundsandsoon.

Opticalfibercommunicationhasatremendousadvantage,first,itscapacityisamazing,athinopticalfibercantransmittensofthousandsorevenhundredsofmillionsofroadcalls,youcantransmitthousandsoftelevisionsets,whichisunmatchedbyothertransportmeansThe.Secondtheopticaltransmissionoflightsignals,electromagneticinterfereneefromoutsideit,notafraidofhumidity,notafraidoferosion,pollution-free,secureandstrong.Opticalfibertransmissionsignallossissmall,onlyone-tenthofthecable.Generalcoaxialcable,atintervalsof1.5kmisnecessarytosetuparelaystationtocompensateforsignalattenuation;andfiberopticcommunicationsrelaystation,thedistancecanexceed10kilometers.Inaddition,thefiberrawmaterialisthatwearefamiliarwiththesand（quartz）,andmoreisontheearthandverycheap.Quartzcanbeproducedafewgramsakilometer-longopticalfiber.Thusinsteadofanordinarymetalwirewithafibercansavealotofvaluablenon-ferrousmetalscopperandlead.Verylightweightoffiber,8fibermadeoffiberopticcable,eachweighingabout60kgkmonly,whilethesamenumberofordinary

cableis4tons.

Infact,farmorethanthefiberopticalcommunicationskillsinthisarea,inmanyways,especiallyinhigh-techfields,pientyoffibernotonlyuseless,butnewtechnologyisleadingtherevolutionyet.

Weknowthatthelightcanbetransmittedinthefiberwhichisalsoknowntolightavarietyofinformationwiththebasicmethod.Inspecificapplicationsofsuchfiber,someonlyneedone（suchasopticalcommunication）,whileothersneedalotofroots（suchastransferbeams）.Inaddition,thereisagreatapplicationofopticalfiber,thatis,imagetransmission.Videoimagetransmissionmeanstodirecttransmissionthroughthefiber,whilethemiddleisnoIongerasopticalcommunicationthroughtheconversionprocessasasignal.Seeninthislight,thetransmittedlightfibercanbedividedintotwocategories,onewithavarietyofsignallight,onecanseethegeneralimageofourdailylight.Sincewecanexpressallkindsofinformationlight,thenthefibercandothingswaytoomuch.Peopleusetocreateawidevarietyoffiberopticequipmentthatwecollectivelyarecalledopticalfibersensors.Fiberopticsensorscannotonlytransmitinformation,butalsoaccesstoinformation.Opticalfibersensorscanmeasuretemperature,pressure,vibration,content,position,rotation,deformation,speed,singlering,voltage,electromagneticfields,etc.,arenumerous.Although,likefiberoptictransmissionoflightsignalswithoutchargeintoomanythings,butitsmanufacturehastomuchtrouble.Opticalfibertransmission,asisusuallythenumberonemillionbythetensofthousandstotheintegrationofveryfinefiberbundle,calledtheimagebundles.Itiswidelyusedinendoscopicaspectsofthehealthcareindustryasweknowittobe.

英文翻译

什么叫光纤及光纤应用领域

在认识光纤之前，我们先来了解一下光的传播。

光是直线传播的，但当光线照射到某一物质上时便会发生折射和反射。

我们常会见到玻璃和镜子“反光”就是指光的反射；一半插入水杯中的直棍看起来不再是直的是光的折射造成的假象。

其实，我们之所以能够看到各种物体，那都是光的折射和反射造成的（如果没有光，我们什么也看不到）。

光可以在真空中传播，也可以在某些物质中传播，这里所说的某些物质，在光学的术语中叫做介质或媒质。

玻璃、石英、空气、水、透明塑料等等都可以传播光线，它们都是传播光的介质。

不同的介质密度是不一样的，比如我们知道，水的密度要比空气大很多。

表面上看起来差不多的物质（如玻璃和石英），它们的密度也是不一样的。

因此，又分“光密介质”和“光疏介

质”O当光线从一种介质射入另一种介质时就会发生折射，好像是光线拐弯儿啦。

即使是同一物质，也会因某些环境条件而产生密度不同，如某处的空气热（密度低），某处的空气冷（密度高），光线在穿越冷热空气时也会发生折射（我们熟知的海市蜃楼就是因这种情况而发生的）。

照到介质表面上的光叫入射光，经过介质折射的光叫折射光。

入射光、折射光和介质的界面（两种介质相接的地方）之间存在着一种相互关系，这就是入射角和折射角。

两个角度随着入射光线角度的变化而变化。

当光线从光密介质射入光疏介质的角度变化到一定程度时，光就不

能再射入另一个介质中