光纤通信复习题(含答案)

《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