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ID:38641666
大小:373.50 KB
页数:10页
时间:2019-06-16
《光纤通信复习题(含答案)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、1.Makeachoice(共十题每题1分)10p(1).Whichofthefollowingdispersion(色散)dosenotexistinsingle-modeopticalfiber?(D)A.material(材料)dispersionB.waveguide(波导)dispersionC.polarization-mode(偏振)dispersionD.intermodal(联合)dispersion(2).Theunit(单位)ofthefiberattenuationcoefficient(衰减系数)is(C)A.d
2、BB.dBmC.dB/kmD.dBm/km(3).thebandsofOpticalfibercommunicationis(B)A.0.01um-0.39umB.0.8um-2.0umC.0.39um-0.79umD.100um-1000um(4).IftheopticalinputpowerofaOpticalamplifieris10mW,andtheopticaloutputpoweris100mWaswell,thenitsoutputgainlevelis(A)A.10dBB.20dBC.30dBD.40dB(5)Inorde
3、rtomakesureofthesystemBER(比特误差率)conditions,iftheminimumopticalinputpowerofthereceiveris1uW,thesensitivityofthereceivermustbe(A)A.-30dBmB.-40dBmC.-20dBmD.-43dBm(6)Theprincipal(主要)lightsourcesusedforfiberopticalcommunicationsapplicationsare:(D)A.OA、LDB.PIN、APDC.PD、LEDD.LD、L
4、ED(7)laser(激光)actionistheresultofthreekeyprocess,whichoneofthefollowingisnotbeincluded?(D)A.photonabsorption(光子吸收)B.spontaneousemission(自发发射)C.stimulatedemission(受激发射)D.compoundradiation(复合发射)(8)Asinglemodefiberusuallyhasacorediameter(芯径)ofA.A.10mB.62.5nmC.125nmD.50mm(9)T
5、omakesurethattheAPDphoto-detectorworksproperly,asufficientlyDisappliedacrossthep-njunction.A.highforward-biasvoltage(高的前置偏压)B.lowforward-biasvoltageC.lowreverse-biasvoltage(低的反相偏压)D.highreverse-biasvoltage(10)WhenDFAfiberamplifierusesaslightRepeaters(中继器),itsmaineffectisB
6、.A.amplifyingandregeneratingthesignalB.regeneratingthesignalC.amplifyingthesignalD.reducingthesignalnoise(11)Ingraded-indexopticalfiber,thenumericalaperture(数值孔径)NAcanbeexpressedasC.A.B.C.D.(12)InpracticalSMFs,thecorediameterisjustbelowthecutoff(截止)ofthefirsthigher-order(
7、高阶)mode;thatis,forVslightlyA.A.<2.4B.>2.4C.=3D.=3.5(13)Itiswellknownthatthetotaldispersioninthesingle-moderegimeiscomposedoftwocomponents:C.A.mode-partitionnoise(电流分配噪声),inter-symbolInterferenceB.frequencychirp,modaldispersionC.materialdispersion,waveguidedispersionD.moda
8、ldispersion,waveguidedispersion(14)Atpresent,erbiumdoped(涂饵的)fiberamplifier’smaximumsmallsignalg
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