专业英语翻译 13.docx
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专业英语翻译 13.docx
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专业英语翻译13
optic-fibercommunication;fiber-opticcommunications
opticalfibercommunicationsFromtheopticalcommunicationtalentshowingitself,hasbecomeoneofthemainpillarsofmoderncommunicationinthemoderntelecommunicationsnetwork,playadecisiveroleinthe.Opticalfibercommunicationasanewtechnology,itsrapiddevelopmentinrecentyears,applicationsbroadrangeofcommunicationsinhistory,butalsotheimportantsymbolofrevolutionofworldnewtechnologyandthefutureinformationsocietyinformationmaintransfertool.
Opticalfiberforopticalfiberabbreviation.Opticalfibercommunicationistolightasthecarrierofinformation,withtheopticalfiberastransmissionmediumisameansofcommunication.Inprinciple,constitutethebasicelementsofopticalfibercommunicationopticalfiber,alightsourceandalightdetector.Opticalfiberinadditiontothemanufacturingprocess,materialcompositionandopticalpropertiesforclassification,intheapplicationoftheopticalfiber,usedtouseforclassification,canbedividedintocommunicationandopticalfibersensorwithopticalfiber.Transmissionmediumopticalfiberisdividedintogeneralandspecialtwo,andfunctionaldevicesforopticalfiberreferstotheamplification,shaping,frequencydivider,frequency,modulationandopticaloscillationfeaturessuchasopticalfiber,andoftenafunctionofthedeviceappearedintheformof.
Thecharacteristicsofopticalfibercommunication
(1)thecommunicationscapacity,transmissiondistance;afiberpotentialbandwidthofupto20THz.Thebandwidth,justonesecond,thenhumanatalltimesandinallcountriesalltextdata.The400Gbit/ssystemhasbeenputintocommercialuse.Theopticallossisextremelylow,inlightwithawavelengthof1.55mnearby,quartzfiberlosslowerthan0.2dB/km,theratioofanycurrenttransmissionmediumlossislow.Therefore,transmissiondistancecanreachtens,evenhundredsofkilometers.
(2)smallsignalinterference,goodsecrecyperformance;(3)resistanttoelectromagneticinterference,thetransmissionqualityisgood,theelectriccommunicationcannotsolveallkindsofelectromagneticinterference,opticalfibercommunicationisnotonlyaffectedbyallkindsofelectromagneticinterference.(4)fiberofsmallsize,lightweight,convenientinstallationandtransportation;(5)andrichmaterialsource,goodenvironmentalprotection,isinfavorofsavingnonferrousmetalscopper.(6)noradiation,difficulttoeavesdropping,becauseopticalfibertransmissionlightcannotrunfiberoutside.(7)cablestrongadaptability,longlife.(8)abrittletexture,poormechanicalstrength.(9)fibercutoffandcontinuetorequirecertaintools,equipmentandtechnology.(10)shunt,couplingflexible.(11)fiberopticcablebendingradiuscannotbetoosmall(>20cm)(12)havethepowersupplyproblem.Theuseoflightinopticalfibercommunication.Becausethelaserhashighdirectivity,highcoherence,highmonochromaticityandothersignificantadvantagesinopticalfibercommunication,lightisalaser,sotheycalledthelaseropticalfibercommunication.
Principle
Opticalfibercommunicationprincipleis:
thesendingendfirsttotransmitinformation(suchasvoice)intoelectricalsignals,andthenthemodulationtothelaserbeamemittedfromthelaser,causingthelightintensitywiththeelectricsignalamplitude(frequency)changes,andtransmittedthroughopticalfiber;atthereceivingend,thelightsignalsarereceivedafterthedetectortransformitintoanelectricalsignal,thedemodulationaftertherestorationoftheoriginalinformation.
Editorthisparagraphdevelopment
Opticalfibercommunicationisthemaintransmissionmeansinthemoderncommunicationnetwork,itsdevelopmenthistoryofonlytenortwentyyears,hasexperiencedthreegenerations:
theshortwavelengthmultimodeopticalfiber,amultimodefiberandlongwavelengthoflongwavelengthsinglemodefiber.Byusingopticalfibercommunicationisthecommunicationhistorygreatchange,beautiful,day,flower,lawtowaitfor20manycountrieshaveannouncednolongerconstructioncablecommunicationline,andcommittedtothedevelopmentofopticalfibercommunicationopticalfibercommunication.Chinahasenteredapracticalstage.Thebirthanddevelopmentofopticalfibercommunicationisanimportanthistoryofthetelecommunicationsrevolutionandsatellitecommunications,mobilecommunicationsandtiedforthenineteennintiestechnology.Enteraftertwenty-firstCentury,becauseoftheInternet,therapiddevelopmentofbusinessandaudio,video,data,multimediaapplicationongrowth,largecapacity(ultrahighspeedandlongdistance)opticaltransmissionsystemsandnetworkshavemorepressingneeds.Opticalfibercommunicationistheuseoflightasacarriertotransmitinformation,andtoopticalfiberastransmissionmediumtorealizeinformationtransmission,toachievecommunicationpurposesanewcommunicationtechnology.Thedevelopmentofcommunicationprocessistoimprovethecarrierfrequencytoexpandthecapacityofcommunicationprocess,opticalfrequencyasthecarrierofcommunicationcarriercap,becausethelightisakindofextremelyhighfrequencyelectromagneticwave,sothelightasacarrierforcommunicationcapacitygreatly,isthelastcommunicationmodeforthousandsoftimes,hasgreatappeal,opticalcommunicationitislongpursuitofthegoal,butalsotheinevitabletrendofdevelopmentofcommunication.Opticalfibercommunicationandtheelectricalcommunication,themaindifferenceisthattherearemanyadvantages:
ittransmissionbandwidth,communicationcapacity;lowtransmissionloss,longdistancerelay;linesmallsize,lightweight,rawmaterialforthequartz,metalmaterialsaving,isconducivetotherationaluseofresources;insulation,strongelectromagneticinterferenceresistingperformance;alsohasstrongcorrosionresistance,strongabilityofresistingradiation,canrotatearoundthewell,nospark,smallleakage,confidentialityandstrongadvantages,butinspecialenvironmentsormilitaryuse.
Applicationfields
Opticalfibercommunicationapplicationfieldisveryextensive,mainlyusedfortelephonetrunkline,opticalfibercommunicationherecangivefullplaytoadvantages,graduallyreplacingthecable,widelyused.Alsousedforlong-distancecommunicationpastmainlybycable,microwave,satellitecommunication,istograduallyuseofopticalfibercommunicationandtheformationofaglobaladvantagebittransmissionmethod;usedforglobalcommunicationnetwork,nationalpublictelecommunicationnetwork(suchasthenationallevel,provinciallevelandthecountyroutetworoutefollowingthebranchline);italsoforhighqualitycolortelevisiontransmission,industrialproductionsitemonitoringandscheduling,trafficsurveillanceandcontrolcommand,urbancableTVnetwork,theantenna(CATV)systemforopticalfiberLAN,andothersuchasinaircraft,spacecraft,shipswithinwithinwithin,mine,electricpowerdepartment,militaryandcorrosionandradiationusedin.Opticalfibertransmissionsystemmainlyconsistsof:
opticaltransmitter,opticalreceiver,opticalcabletransmissionline,opticalrepeaterandavarietyofpassiveopticalcomponents.Communicationistobeachieved,thebasebandsignalmustpassthroughtheelectricmachinetoprocessthesignalssenttotheopticalfibertransmissionsystemtocompletethecommunicationprocess.Itissuitableforfiberopticcommunicationsystem,butalsosuitableforopticalfiberdigitalcommunicationsystemanddatacommunicationsystem.Infiberopticcommunicationsystem,signalprocessingreferstothebasebandsignalisamplified,themodulationofsuchtreatment,andtheelectricalsignalprocessingistheoriginatoroftheprocessingoftheinverseprocess,namely,amplification,demodulationprocessing.Inopticalfiberdigitalcommunicationsystem,signalprocessingreferstothebasebandsignalisamplified,sampling,quantization,namelythepulsecodemodulation(PCM)andlinecodetypecodeprocessing,andsignalprocessingisalsotheoriginatoroftheinverseprocessofanti.Thedataofopticalfibercommunication,signalprocessingincludesthesignalamplification,anddigitalcommunicationsystemisthatitdoesnotneedcodeconverter.
Developmenttrend
Fibertothehome(FTTH)development
FTTHmaybeprovidedtotheuserinaveryrichbandwidth,ithasbeenconsideredtheidealwayofaccess,fortherealizationofinformationsocietyhasanimportantrole,alsoneedtolarge-scalepromotionandconstruction.FTTHneededforfibermaybeanexistingapplicationfiber2~3times.DuetothehighcostofFTTH,thelackofbroadbandvideoserviceandbroadbandcontentandotherreasons,theFTTHalsofailedtomentionprogramtocomeup,onlyasmallamountoftest.Recently,duetotheprogressofoptoelectronicdevices,opticaltransceivermoduleandopticalfiberisgreatlyreducedprice;plusbroadbandcontenttoalleviatesomewhat,haveacceleratedtheprocessofpracticalFTTH.DevelopedontheFTTHviewisnotexactlythesame:
theUnitedStatesAT&TthinkFTTHmarketissmaller,atthe0F62003FTTH20-50said:
intheyearsafterthemarket.TheUnitedStatesofAmericaoperatorsVerizonandSprintpositive,in10-12yearswithFTTHtransformationnetwork.JapanNTTdevelopmentFTTHoriginally,nowhasnearly2000000users.Atpresent,ChinaisinthepilotphaseoftheFTTH.TheFTTH[challenges:
nowwidelyusedADSLtechnologytoprovidebroadbandbusinessstillhascertainadvantages.ComparedwithFTTH:
thecheappriceofusingtheoriginalcoppernetsoconstructionsimple,the1Mbps-500kbpsvideotransmissionwhichc
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