武汉理工 光纤通信复习材料(英文).doc

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1、l.Makeachoice(共十题每题1分)10p(I).Whichofthefollowingdispersiondosenotexistinsingle-modeopticalfiber?(D)A.materialdispersionB.waveguidedispersionC.polarization-modedispersionD.intennodaldispersion(2).TheunitoflheiiberattenuationcoefBcientis(C)A.dBB.dBmC.dB/kmD.dBrn/km(3).thebandsofOp

2、ticalfibercommunicationis(B)A.0.0lum-0.39umB.0.8urn-2.0umC.0.39um-0.79umD.1OOurn-1OOOum(4).IftheopticalinputpowerofaOpticalamplifieris1OmW,andtheopticaloutputpoweris100mWaswell,thenitsoutputgainlevelis(A)A.IOdBB.20dBC.30dBD.40dB(5)InordertomakesureofthesystemBERconditions,ifthem

3、inimumopticalinputpowerofthereceive『isIuW,thesensitivityofthereceivermustbe(A)A.—30dBmB.—40dBmC.—20dBmD.—43dBm(6)Theprincipallightsourcesusedforfibe『opticalcommunicationsapplicationsare:(D)A.OA、LDB.PIN、APDC.PD、LEDDID、LED(7)laseractionistheresultofthreekeyprocess,whichoneofthefol

4、lowingisnotbeincluded?(D)A.photonabsorptionB.spontaneousemissionC.stiinulatedemissionD.compoundradiation(8)AsinglemodefiberusuallyhasacorediameterofA・A.10mB.62・5nmC.125nmD.50mm(9)TomakesurethattheAPDphoto-detectorworksproperly,asufficientlyDisappliedacrossthep-njunction.A.highfo

5、rward-biasvoltageB・lowforward-biasvoltageC・lowreverse-biasvoltageD・highreverse-biasvoltage(10)WhenDFAfiberamplifierusesaslightRepealers,itsmaineffectis氏，A.amplifyingandregeneratingthesignalB.regeneratingthesignalC・amplifyingthesignalD.reducingthesignalnoise(II)Ingraded-indexopti

6、calfiber,thenumericalapertureNAcanbeexpressedasC.A.y]nl-n2B.aV2AC.D.ajm_n?(12)InpracticalSMFs,thecorediamete『isjustbelowthecutoffofthefirsthigher-ordermode;thatis,forVslightlyA.A.<2.4B.>2.4C.=3D.=3.5(13)Itiswellknownthatthetotaldispersioninthesingle-moderegimeiscomposedoftwocomp

7、onents:C・A.modopaititionnoise,inter-symbolInterferenceB.frequencychirp,modaldispersionC・ma〔erialdispersion,waveguidedispersionD.modaldispersion,waveguidedispersion(14)Atpresent,erbiumdopedfiberamplifiersmaximumsmallsignalgainisaroundA.A.40dBB.30dBC.20dBD.10dB(15)Whichofthefollow

8、ingdoesn'tbelongtopassiveopticalcomponentsBA.Di