【MOOC】Optical Fiber Communications-Nanjing University of Posts and Telecommunications 中國大學(xué)慕課MOOC答案

【MOOC】OpticalFiberCommunications-NanjingUniversityofPostsandTelecommunications中國大學(xué)慕課MOOC答案Exercise1、【單選題】Forthemeaningsofoptical/lightwavecommunicationsandopticalfibercommunications,whichofthefollowingstatementsisright?本題答案：【Thecoverageofoptical/lightwavefibercommunicationsislargerthanthatofopticalcommunications】2、【單選題】In2009,CharlesKuenKao（K.C.Kao）wonaNobelPrizeforhisgreatcontributioninthetheoryofopticalfibercommunications.InwhichareaistheNobelPrizeKaowon?本題答案：【NobelPrizePhysics】3、【單選題】Inthe1970s,opticalfibercommunicationsfacedimplementationchallenges.Whichoneisthekeytechnicalissue?本題答案：【Howtocreateatransmissionmediumwithsufficientlylowloss.】Exercise1、【單選題】Whichofthefollowingisthemostpopularfrequencyspectrumusedincommunicationworld?本題答案：【RadioandMicrowave】2、【單選題】Ifweadopt1mWasthereferencepowerlevel,howaboutthepowerlevel1Wexpressedindecibelunit?本題答案：【30dBm】3、【單選題】WhichspectrumbandoffollowsdoesNOTbelongtoopticalspectrumband?本題答案：【X-band】Exercise1、【單選題】WhichofthefollowingisNOTthecomponentofanopticalfiber?本題答案：【PEshield】2、【單選題】Whichofthefollowingisthemainmaterialofopticalfiber?本題答案：【SiO2】3、【單選題】Whataretherequirementsfortherefractivedifferencebetweencoren1andcladdingn2?本題答案：【n1mustbebiggerthann2】Exercise1、【單選題】Whichofthefollowingstatementsaboutfiberstructureisincorrect?本題答案：【Thesizeofthecoreiscomparabletothatofthecladding】2、【單選題】Whichoneisthemostimportantthingintheopticalfibermanufacturingprocess?本題答案：【Purificationofrawmaterials】3、【單選題】Whichofthefollowingisnotacommonopticalcablestructure?本題答案：【Honeycombtype】Test11、【判斷題】Thecoreandcladdingcannotbephysicallyseparated.本題答案：【正確】2、【判斷題】Aftertheopticalfiberismanufactured,itscut-offwavelengthparametercanbedetermined.本題答案：【正確】3、【判斷題】Thecoreandcladdingaremadeofpreformedwire.本題答案：【正確】Exercise1、【單選題】WhichofthefollowingdoesNOTbelongtolightparticleproperty?本題答案：【Polarization】2、【單選題】Whenmeetsanobstaclewithverysmallsize,wavecanspillovertheedgeoftheirobstructions.Thisphenomenoniscalled?本題答案：【Diffraction】3、【單選題】Whobelievedthatthenatureoflightcanbeunderstoodasofstreamsofparticles?本題答案：【Newton】Exercise1、【單選題】Alightwavepassesfromalessdensemediumtoadenserone,whatwillhappen?本題答案：【Totalreflectionwillnotoccur】2、【單選題】Whatisthepremiseassumptionoftheanalyticalmethodsforthegeometricoptics?本題答案：【thewavelengthoflightapproaches0】3、【單選題】Inordertoensuretheconditionoftotalreflectionattheinterfacebetweenthecoreandthecladding,whatwilltheincidentangleofopticalsignalstofiberendfaceshouldbe?本題答案：【Thesmallerthebetter】Exercise1、【單選題】Whatisthefundamentalmodetransmittedinsingle-modefiber?本題答案：【HE11】2、【單選題】Howtounderstandthephysicalmeaningofthemodesinthefiber?本題答案：【Theexistenceorthedistributionofelectromagneticfieldinthefiber】3、【單選題】Ifamodeexperiencesalmostnoattenuationinthecladding,howtodescribethemode?本題答案：【Cutoff】Test21、【單選題】Whichofthefollowingstatementsaboutthenumericalaperture(NA)ofanopticalfiberisincorrect?本題答案：【Thesmallerthenumericalapertureis,thebetter】2、【單選題】Whichofthefollowingisthemaincauseofthenonlineareffectofopticalfiber?本題答案：【Inputpoweroftheopticalsignal】3、【單選題】WhatisthemainfactorcausingRayleighscattering?本題答案：【Defectsequivalenttothewavelengthscaleofthefiber】Exercise1、【單選題】Byreducingwhichofthefollowingions,cantheabsorptionattenuationaround1.4μmbeeffectivelyreduced?本題答案：【OH-】2、【單選題】WhichoffollowingNOTbelongstopowerdependentloss?本題答案：【BendingLoss】3、【單選題】Whichofthefollowingbelongstotheintrinsicmaterialabsorption?本題答案：【Ultra-violetabsorption】Exercise1、【單選題】ThefiberdispersionwillNOTcausewhatkindofeffects?本題答案：【Pulseamplitudereduction】2、【單選題】WhichoffollowingdoesNOTbelongtodispersion?本題答案：【Refractivedispersion】3、【單選題】Whichofthefollowingisnotthecharacteristicofopticalfibertransmissions?本題答案：【Color】Exercise1、【單選題】Whichofthefollowingisthemaincauseofthenonlineareffectofopticalfiber?本題答案：【Inputpoweroftheopticalsignal】2、【單選題】WhichofthefollowingdoesNOTbelongtointensity-dependentvariationsintherefractiveindex?本題答案：【SRS】3、【單選題】Whichofthefollowingnonlinearitiesonlyhappeninbackwarddirection?本題答案：【SBS】Exercise1、【單選題】Whichtypeofopticalfiberismostsuitableforhigh-speedmulti-channelsystemsthatoperateatthewavelengthof1.55μm?本題答案：【G.655】2、【單選題】Whichtypeoffibershavetheleastlossatanoperatingwavelengthof1.55μm?本題答案：【G.654】3、【單選題】Whichofthefollowingopticalfiberhassmalllossafterbendingandissuitableforthereceivingsideofendusers?本題答案：【G.657fiber】Test31、【判斷題】Themaincauseoftheenergyattenuationofsignaltransmissioninanopticalfiberisthelosscharacteristicsoftheopticalfiber.本題答案：【正確】2、【判斷題】Thedispersioninmultimodefiberismainlytheintermodaldispersion.本題答案：【正確】3、【判斷題】Theoperatingwavelengthwindowwiththesmallestfibertransmissionlossisnear1.55μm.本題答案：【正確】4、【判斷題】Forthesameopticalfiber,thesystemwithhighertransmissionrateismoresensitivetodispersion.本題答案：【正確】5、【判斷題】Multi-channelsystemsaremoresusceptibletofibernonlinearitythansingle-channelsystems.本題答案：【錯誤】Exercises1、【單選題】Whenthenumberofparticlesinasubstanceatahighenergylevelisgreaterthanthenumberofparticlesatalowenergylevel,thesubstanceisinstate.本題答案：【Particleabnormaldistribution】2、【單選題】Regardingtoalaser,theamplificationoflightisachievedthrough.本題答案：【ActivatingmaterialwithParticleabnormaldistribution】3、【單選題】Theenergylevelstructureofsemiconductormaterialsisnotadiscretesingle-valuedenergylevel,butabandstructurewithacertainwidth,called.本題答案：【Energyband】Exercises1、【單選題】ThelightemittedbytheLEDisincoherentlight,anditsbasicprincipleis.本題答案：【spontaneousradiation】2、【單選題】Whichofthefollowingisrightregardingtothethresholdcurrentofasemiconductorlaser?本題答案：【Thesmallerthebetter】3、【判斷題】Theroleofsemiconductorlasersandlight-emittingdiodesistorealizetheelectro-opticalconversion,whichisessentiallyaPNjunctionwithreversebiasapplied.本題答案：【錯誤】Exercises1、【單選題】Theemissionopticalspectrumofasemiconductorlaservarieswhenworkingconditionschange.Whentheinjectioncurrentislowerthanthethresholdcurrent,itemits.本題答案：【Fluorescencewithawidespectrallinewidth】2、【單選題】Onedisadvantageofsemiconductorlaser(LD)is.本題答案：【Poortemperaturecharacteristics】3、【單選題】Whentheoperatingtemperatureofthesemiconductorlaserincreases,itsoutputopticalpowerwill.本題答案：【Decrease】Test41、【單選題】Thefunctionofthelightsourceisto.本題答案：【convertelectricalsignalcurrentintoopticalsignalpower,inotherwords,realizeelectrical-opticalconversion】2、【單選題】Thekeydevicetorealizeelectric/opticalconversioninopticaltransmitteris.本題答案：【Lightsource】3、【判斷題】TheP-IcharacteristicofLEDislinear,sonomatterwhetheritismodulatedbyanalogsignalordigitalsignal,nobiascurrentisrequired.本題答案：【錯誤】Exercises1、【單選題】Themodulation-detectionmethodthatiswidelyusedinopticalfibercommunicationsystemsis.本題答案：【Intensitymodulation-directdetection】2、【單選題】Therateof5B6Bcoderateincreasesby.本題答案：【20%】3、【單選題】Whichofthefollowinglinecodesisnotcommonlyused?本題答案：【NRZcode】Exercises1、【單選題】Toaccuratelycontroltheoutputpowerofthelaser,weshouldproceedfromtwoaspects:oneistocontroltheamplitudeofthemodulatedpulsecurrent;theotheristocontrol.本題答案：【biascurrentoflasers】2、【單選題】Ingeneral,theextinctionratiooftheopticaltransmitterisrequiredtobelessthanorequalto.本題答案：【10%】3、【判斷題】ThetemperaturecharacteristicsreflecttherelationshipbetweentheLD'sP-Icharacteristicsandtemperature.Whenthetemperatureincreases,thethresholdcurrentincreases.Iftheinjectioncurrentremainsunchangedwhenthetemperatureincreases,theoutputopticalpowerdoesnotchange.本題答案：【錯誤】Exercises1、【單選題】Therequirementsforopticaltransmittersdonotinclude.本題答案：【Veryhighoutputopticalpower】2、【單選題】Thetransmittedsignalwaveformstipulatesthecharacteristicsoftheopticalpulseshapeofatransmitterintheformofatransmittedeyepatternframe,whichisNotincluded.本題答案：【Noiselevel】3、【單選題】Whichofthefollowingisnotthemainlimitationofopticaltransmissionsignals.本題答案：【amplitude】Test51、【單選題】Theroleofaddingascramblerbeforethemodulatorofthesystemopticaltransmitteristo.本題答案：【Controltheappearanceoflongstrings1and0】2、【單選題】Astheusagetimeofthesemiconductorlaserincreases,itsthresholdcurrentwillbe.本題答案：【graduallyincrease】3、【判斷題】Thepurposeofscramblingcodeistomakeiteasytotransmitthesignalovertheline.本題答案：【錯誤】Exercises1、【單選題】Thephotodetectorusesmaterial()torealizephotoelectricconversion.本題答案：【Photoelectriceffect】2、【單選題】Thephotodetectorswidelyusedinopticalfibercommunicationsystemsmainlyinclude.本題答案：【PINphotodiode,APDavalanchephotodiode】3、【單選題】Thekeydevicetorealizetheoptical/electricalconversionintheopticalreceiveris.本題答案：【Photodetector】Exercises1、【單選題】WhichofthefollowingisnotamaincharacteristicofPINphotodiode?本題答案：【W(wǎng)avelengthresponsivity】2、【單選題】Thequantumefficiencyofavalanchephotodiodesisonlyrelatedtothenumberofprimaryphotocarriers,anddoesnotinvolvethemultiplicationproblem,sothequantumefficiencyisalways本題答案：【lessthan1】3、【判斷題】Quantumefficiencyistheratiooftheaveragenumberofphotoelectronsgeneratedperunittimeataspecificwavelengthtothenumberofincidentphotons.本題答案：【正確】Exercises1、【單選題】Intheopticalreceiver,thenoisesintroducedbytheavalanchephotodiodeinclude本題答案：【Quantumnoise,darkcurrentnoiseofphotodetector,avalanchemultiplicationnoise】2、【單選題】ThepowersignaltonoiseratioS/Nattheoutputofanopticalreceiverisdefinedby().本題答案：【signalpowerfromphotocurrent/(photodetectornoisepower+amplifiernoisepower)】3、【判斷題】Whennolightisincidentonthelight-receivingelementssuchasphotodiodes,thecurrentflowinginthedeviceiscalleddarkcurrent.本題答案：【正確】Test61、【單選題】WhichofthefollowingstatementsrelatingtothebiasvoltageofPINandAPDiscorrect?本題答案：【Botharereverse-biased】2、【單選題】Thenoiseofthephotodetectorincludesquantumnoise,darkcurrentnoise,leakagecurrentnoiseandmultiplicationnoiseof.本題答案：【Avalanchephotodiode】3、【單選題】Whichofthefollowingphysicalquantitydescribestheoptical-to-electricconversionefficiencyofthephotodetector.本題答案：【Responsivity】Exercises1、【單選題】Atypicalopticalreceiverismainlycomposedof____.本題答案：【Opticalreceivingcircuitandoutputinterfacecircuit】2、【單選題】Thepreamplifiermustmeettherequirementsof____toobtainahighsignal-to-noiseratio.本題答案：【Lownoiseandhighgain】3、【單選題】Intheclock(timing)recoverycircuit,baselineprocessingisperformedinorderto____.本題答案：【Reduceerrorbits】Exercises1、【單選題】Ifthebiterrorrateofanopticalreceiveris,thentheparameterQisapproximatelyequalto____.本題答案：【6】2、【單選題】Whichofthefollowingstatementsinvolvingthebiterrorrateofopticalreceptioniscorrect?本題答案：【Forsystemswithabiterrorrateof,thereisanaverageof1errorbitper1Mbitstransmitted.】3、【判斷題】Theerrorrateforopticalfibertelecommunicationsystemsdependsonthesignal-to-noiseratioatthereceiver.本題答案：【正確】Exercises1、【單選題】Whichofthefollowingisthekeyindexofopticalreceiver?本題答案：【Sensitivityanddynamicrange】2、【單選題】Inanidealopticalfibercommunicationsystem,whenthebiterrorratePeisrequiredtobe,theopticalpulsecorrespondingtoeach1codereceivedbytheopticalreceiverincludesatleast____photons.本題答案：【21】3、【單選題】____characterizestheabilityoftheopticalreceivertoadapttochangesoftheinputsignal.本題答案：【Dynamicrange】Test71、【單選題】Themainqualityindexoftheopticalreceiverissensitivity,andthemainfactorsthataffectthesensitivityare----____.本題答案：【Noiseofopticalreceiver】2、【單選題】Undertherequirementofguaranteeingthebiterrorrateofthesystem,theminimuminputopticalpowerofthereceiverismeasuredtobe1uW,thenthereceiversensitivityis.本題答案：【-30dBm】3、【判斷題】Opticalreceiversensitivityreferstotheminimumaverageopticalpowerthattheopticalreceiverneedstoreceive.本題答案：【錯誤】Exercises1、【單選題】Ifthesourceemittingareaisthecorearea,aminiaturelenscanimprovethepower-couplingefficiency.本題答案：【smallerthan】2、【單選題】Whichthefollowingisnotthemechanicalalignmentbetweentwofibers?本題答案：【Transverse】3、【單選題】Considereachfiberhasacorediameterof50μm,ifthetwofibershaveanaxialmisalignmentof5μm,whatistheinsertionlossatthejoint?本題答案：【-0.590dB】Exercises1、【單選題】isadevicethatcompletesactiveconnectionbetweentwoopticalfibers.本題答案：【Fiberconnector】2、【單選題】Accordingto,opticalfibermovableconnectorscanbedividedintotwotypes:aligningtypeandnon-aligningtype.本題答案：【Structure】3、【單選題】Whenusingaconnectorforopticalfiberconnection,iftheconnectorisnotcontinuous,itwillcause.本題答案：【Partofthescatteringlossofopticalpowerorreturntothetransmittingendintheformofreflection】Exercises1、【單選題】opticalfibercoupleristofusetwoormoreopticalfiberstogetherbyheating.本題答案：【Fusedconetype】2、【單選題】Whentheopticalfibercommunicationneedstotakeapartofthemaintransmissionchanneloftheopticalfiberfortesting,itneedstouse.本題答案：【Opticalcoupler】3、【單選題】Thedevicethatthesemiconductorlaserselectsthefrequencyanddirectionoflightis.本題答案：【Opticalresonator】Exercises1、【單選題】Whichofthefollowingarenotopticalpassivedevices?本題答案：【Laser】2、【單選題】Opticalattenuatorisadevicethatisusedto.本題答案：【Changetheopticalpower】3、【單選題】representstheabilityofanopticalisolatortoblockreflectedlight.本題答案：【Isolation】Test81、【單選題】Whichofthefollowingarenotactivedevices?本題答案：【Opticalswitch】2、【單選題】Theworkingprincipleoftheopticalisolatoris.本題答案：【Ensurethattheopticalsignalcanonlypropagateforward】3、【單選題】Theimportantcomponentstoconverttheopticalpathandrealizetheopticalexchangeare.本題答案：【opticalswitch】Exercises1、【單選題】Thebasicworkingprincipleofopticalamplifieristhe.本題答案：【Stimulatedradiation】2、【單選題】Gainsaturationlimitstheamplifier's.本題答案：【Magnificationability】3、【單選題】Thedegreeofreductionofthesignal-to-noiseratiooftheamplifiedsignalintheopticalamplifierisusuallyexpressedby.本題答案：【Noisefigure】Exercises1、【單選題】Theoperatingwavelengthoftheerbium-dopedfiberamplifierisintherangeof.本題答案：【1530nm-1560nm】2、【單選題】Whichofthefollowingstatementsisincorrect?本題答案：【Thepumppowerrequiredtostimulatetheerbium-dopedfiberisrelativelyhigh】3、【單選題】Intheco-directionalpumpederbium-dopedfiberamplifier,thetransmissiondirectionsofthepumpinglightandthesignallightare.本題答案：【thesame】Exercises1、【單選題】ThepumpwavelengthcurrentlyusedbyEDFAis.本題答案：【0.98μmand1.48μm】2、【單選題】WhichofthefollowingisnottheadvantageofEDFA?本題答案：【Abilityofamplifyingmultiplebands】3、【單選題】WhichofthefollowingisnottheapplicationofEDFA?本題答案：【Equalizationamplifier】Exercises1、【單選題】TheamplificationofopticalsignalsbyfiberRamanamplifiersmainlyutilizestheeffectof.本題答案：【StimulatedRamanscattering】2、【單選題】WhichofthefollowingisincorrectregardingtotheopticalfiberRamanamplifier?本題答案：【FiberRamanamplifiercanonlyamplifysignalsataspecificwavelength】3、【單選題】ThesaturationpowerandamplificationbandofthefiberRamanamplifieraremainlydeterminedby______.本題答案：【Pumpinglight】Test91、【單選題】Thepreamplifierreferstothedevicetightlyconnectedto.本題答案：【Photodetector】2、【單選題】TheopticalamplificationprincipleofEDFAis.本題答案：【stimulatedradiation】3、【單選題】ThefunctionoftheopticalisolatorinEDFAismainlyto.本題答案：【Eliminatetheinfluenceofthereflectedlight】Exercises1、【單選題】ThemeaningofPDHis.本題答案：【Plesiochronousdigitalhierarchy】2、【單選題】WhichofthefollowingstatementsaboutPDHiswrong?本題答案：【ThePDHstandardofChinaisthesameasthoseofNorthAmericaandJapan】3、【判斷題】Currently,PDHmostlyadoptssynchronousmultiplexing.本題答案：【錯誤】Exercises1、【單選題】IntheSDHframestructure,isusedtotransmittheadditionalbyteofnetworkoperation,managementandmaintenance.本題答案：【Sectionoverhead】2、【單選題】IntheSDHSTM-1framestructure,theoverheadbyteoftheregenerationsectionislocatedin.本題答案：【Thefirst9columnsofrows1-3】3、【單選題】WhichofthefollowingdoesnotbelongtotheSDHframestructure?本題答案：【Tributaryunit】Exercises1、【單選題】Mappingrefersto.本題答案：【Theprocessofadaptingthetributarysignaltovirtualcontainer】2、【單選題】istheoverheadusedfornetworkmanagementbetweenvirtualcontainersVC-1/VC-2intheSTM-Nframestructure.本題答案：【Loworderpathoverhead】3、【單選題】Whichofthefollowingbasicunitscancompletetheadaptationbetweenthelow-orderpathlayerandthehigh-orderpathlayer?本題答案：【Tributaryunit】Exercises1、【單選題】TheSDH-specificpointeradjustmentwillexperiencealargephasejumpattheSDH/PDHnetworkboundary,soeverytimethe2Mbit/ssignalusedtotransmitthenetworktimingreferencepassesthroughtheSDHnetwork,theamountthatthepointeradjustsis.本題答案：【8】2、【單選題】TheadjustmentunitoftheTU-12pointerisbytes,andthepointerrangeknownis0-139.本題答案：【1】3、【判斷題】SDHpointerisdividedintoAUpointerandTUpointer.本題答案：【正確】Test101、【單選題】OneSTM-4canaccess2Mb/ssignals.本題答案：【252】2、【單選題】IntheSDHframestructure,thepathoverheadisrepresentedby.本題答案：【POH】3、【單選題】Theroleoftheadministrativeunitpointeristo.本題答案：【IndicatetheexactpositionofthefirstbyteofthepayloadintheSTM-Nframe,sothatthereceivercandemultiplexitcorrectly】Exercises1、【單選題】Theclockboardautomaticallyentersaccordingtothememorizeddatawhenallclocksourcesarelost.本題答案：【Holdmode】2、【單選題】ThesynchronousdigitalnetworkofChinaadoptsthemethod.本題答案：【Master-slavesynchronization】3、【單選題】Whichofthefollowingworkingmodesforslaveclocksisthemostaccurate?本題答案：【Trackingsynchronizationmode】Exercises1、【單選題】AsanSDHtransmissionequipment,theterminalmultiplexeris.本題答案：【TM】2、【單選題】WhichofthefollowingisnotanSDHnetworkelement?本題答案：【ONU】3、【判斷題】IntheSDHtransmissionnetwork,DXCequipmentisoftenusedinthemeshnetworknodeorthecentralnodeofthestarnetwork.本題答案：【正確】Exercises1、【單選題】TheSDHself-healingringstructurecanbedividedintotwocategories,namely,.本題答案：【Pathprotectionringandmultiplexsectionprotectionring】2、【單選題】SDHself-healingringprotectionswitchingtimeisrequiredtobelessthan.本題答案：【50ms】3、【單選題】InSDHself-healingringprotection,needstouseAPSprotocolforswitching.本題答案：【Two-fiberunidirectionalpathprotectionring】Exercises1、【單選題】TheOTNInterfaceDatarateOUT-1is.本題答案：【2.66Gbit/s】2、【單選題】WhichofthefollowingisnotthecharacteristicoftheOpticalTransportNetwork(OTN)?本題答案：【Inabilitytomanageallwavelengthsinmultipleopticalfibers】3、【判斷題】OpticalTransportNetwork(OTN)isatransportnetworkthatisbasedonwavelengthdivisionmultiplexingtechnologyandorganizesattheopticallayer.OTNisthenextgenerationbackbonetransportnetwork.本題答案：【正確】Test111、【單選題】Theclockboardhasbeenworkinginthetrackingmodefor3days,itautomaticallyenterstheholdmodeduetothelossofthetrackingclock,holdingtimecanbeuptohours.本題答案：【24】2、【單選題】Thetwo-fiberbidirectionalmultiplexsectionprotectionringusestechnologytocombinethesignalsontwofibersintoonefiber.本題答案：【Timeslotexchange】3、【單選題】Thefunctionoftheopticalcross-connect(OXC)devicedoesnotinclude.本題答案：【Amplificationfunction】Exercises1、【單選題】Theroleofistoprovideopticalaccessnetworkaninterfacebetweenthenetworksideandthelocalswitch,andtocommunicatewiththeONUattheusersideviaoneormoreODNs.本題答案：【OLT】2、【單選題】Whichofthefollowingisnotequipmentoftheopticalaccessnetwork?本題答案：【ATU-R】3、【判斷題】Accordingtotheemploymentofactivedevicesinfacilities,opticalaccessnetworksaredividedintoactiveopticalnetworksandpassiveopticalnetworks.本題答案：【正確】Exercises1、【單選題】APONreferstoPONusingtransmission.本題答案：【asynchronoustransfermode】2、【單選題】ThedownstreamrateofAPONisMb/s.本題答案：【155.52】3、【判斷題】APONisEthernetpassiveopticalnetworkofinternationalstandardIEEE802.3ah.本題答案：【錯誤】Exercises1、【單選題】InEPON,theupstreamanddownstreamdataaretransmittedviatwodifferentwavelengths,namely,.本題答案：【1310nm,1550nm】2、【單選題】EPONhasanupstreamtransmissionrateat1.25GbpsandadownstreamrateatGbps.??本題答案：【1.25】3、【判斷題】EPONisapassiveopticalaccesstechnologybasedonATM/GEM,followingtheITU-TG.984seriesofstandards.本題答案：【錯誤】Exercises1、【單選題】servicescanbecarriedbyGPON.本題答案：【ATM,TDM,andEthernet】2、【單選題】InGPON,along-lightingONUmaycause.?本題答案：【offlineofotherONUsunderthesamePON】3、【單選題】ThemaximumsplitratioadoptedbytheGPONsystemis.本題答案：【1:128】Test121、【單選題】providesanopticaltransmissionmeansbetweenOLTandONU.Itsmainfunctionistocompletethetaskofopticalsignalpowerdistribution.本題答案：【ODN】2、【單選題】TheinternationalstandardofEPONis.??本題答案：【IEEE?802.3ah】3、【判斷題】ATMPONiscalledpassiveopticalnetworkbasedonasynchronoustransfermodetechnology.本題答案：【正確】Exercises1、【單選題】isatechnologythattransmitsmultiplewavelengthsignalsinasinglefiber.本題答案：【Opticalwavelengthdivisionmultiplexingtechnology】2、【單選題】Whichofthefollowingtechnologiesisaneffectivewaytoincreasethecapacityofinformationtransmittedoneachchannel?本題答案：【Opticaltimedivisionmultiplexing】3、【單選題】WhichofthefollowingisnotthemainadvantageofWDM?本題答案：【Theadopteddigitalsynchronizationtechnologydoesnotrequirecodeadjustment】Exercises1、【單選題】ITU-TG.692recommendsthattheworkingwavelengthoftheWDMsystemiscurrentlyat.本題答案：【Cband】2、【單選題】Fortheworkingfrequencyofthewavelengthdivisionmultiplexingsystem,whichofthefollowingistheabsolutefrequencyreference(AFR)?本題答案：【193.1THz】3、【單選題】For160×10Gbit/sDWDMsystems,thechannelspacingis?.??本題答案：【50GHz】Exercises1、【單選題】IntheWDMopticaltransportnetwork,theopticalsupervisorychannelconsistsofframealignmentsignalsandpayload,andhasatransmissionrateofMbit/s.??本題答案：【2.048?】2、【單選題】Intheopticaladd/dropmultiplexer,inordertoachievethesamepowerbetweentheaddandpasswavelengthchannels,canbeused.?本題答案：【Variableopticalattenuator?】3、【單選題】OTUinthewavelengthdivisionmultiplexingsystemisresponsibleforconvertingopticalsignalsintoopticalsignalsthatcomplywiththeG.957technicalstandard.本題答案：【Non-standardwavelength】Exercises1、【單選題】Inthe1530~1565nmwindow,whichofthefollowingfibertypessufferfromthemostseverefour-wavemixingeffect?本題答案：【DSF】2、【單選題】isthemaincauseoffour-wavemixing.本題答案：【Zerodispersion】3、【判斷題】Atthe1550nmwindowofG.652fiber,thedispersioncoefficientDofthefiberispositive,andthegroupvelocityoftheopticalcarrierisproportionaltothecarrierfrequency.本題答案：【正確】Test131、【單選題】Thecurrentwavelengthdivisionmultiplexingsystemisdevelopednearthewavelengthof.本題答案：【1550nm】2、【單選題】Inthedensewavelengthdivisionsystem,theworkingwavelengthofthesupervisorychannelisat.本題答案：【1510nm】3、【判斷題】Accordingtothespacingbetweenwavelengthchannels,WDMcanbedividedintodensewavelengthdivisionmultiplexingandcoarsewavelengthdivisionmultiplexing.本題答案：【正確】Exercises1、【單選題】Thebiterrorrateisoneoftheimportantindicesdescribingthequalityofdatacommunicationsystems.Whichofthefollowingstatementsaboutthebiterrorrateiscorrect?本題答案：【Biterrorrateisanimportantindexthatmeasuresthetransmissionreliabilityofadatacommunicationsystemundernormaloperations;】2、【單選題】Thebetterwaytoevaluateerrorperformanceis.本題答案：【theerrortimeratio】3、【判斷題】Driftreferstotheshort-termdeviationofeachvalidmomentofadigitalsignalfromitsidealposition.本題答案：【錯誤】Exercises1、【單選題】Inthecyclicredundancycheck(CRC),isthecyclicredundancycode.本題答案：【Remainder】2、【單選題】Whichofthefollowingstatementsabouttheerrordetectioncapabilityofthecyclicredundancycheckcodeistrue?本題答案：【Allodd-biterrorscanbedetected】3、【判斷題】WhenusingdifferentgeneratorpolynomialstogenerateCRCcodes,theerrorcorrectionabilitiesoftheobtainedCRCcodesarethesame.本題答案：【錯誤】Exercises1、【單選題】Intheformulaoftheworstvaluealgorithmthatcalculatestheattenuationlimitedrelaydistance,thevalueofthefiberopticcablemargin(MC)issettobedb.?本題答案：【3-5】2、【單選題】Themainfactorthatlimitstherelaydistanceofopticalfibercommunicationsis.本題答案：【Attenuationanddispersion】3、【判斷題】Therelaydistanceofthedigitalcommunicationsystemisnotlimitedbydispersion.本題答案：【錯誤】Exercises1、【單選題】referstotheabilityofaproducttoperformaspecifiedfunctionundergivenconditionsforastatedtimeinterval,whichisoftencharacterizedbyfailurerate.本題答案：【reliability】2、【單選題】referstotheprobabilitythattheproductisingoodworkingconditionunderspecifiedconditionsatastatedtime.本題答案：【availability】3、【判斷題】China'snationalstandardsrequiresopticalcommunicationsystemwithmaximum5000kmdistancewillallow8failuresperyear.本題答案：【錯誤】Test141、【單選題】isatransientinstabilityintheprocessofdigitalsignaltransmission.Itreferstothedeviationofeachvalidmomentofthedigitalsignalfromthestandardtimepoint.本題答案：【jittercharacteristics】2、【單選題】Thesystembiterrorrateoftheopticalcommunicationsystemshouldgenerallybelessthan.本題答案：【】3、【單選題】Inanopticalfibercommunicationsystem,thesystemerrorperformanceisanimportantindexofitsquality.Amongthem,theratioofthenumberoferrorbitsreceivedtothetotalnumberofbitsinthelong-termobservationiscalled?????.本題答案：【Long-termaveragebiterrorrate】Exercises1、【單選題】Opticalsolitoncommunicationrequiresthepulsewidthprovidedbytheopticalsolitonsourcetobeontheorderof.本題答案：【ps】2、【判斷題】Opticalsolitonisanultra-shortopticalpulsewhoseamplitudeandwidthremainunchangedafteralong-distancetransmissionthroughoptical