1.25gbpsepon系統(tǒng)突發(fā)式接收模塊設(shè)計(jì)

1、武漢理工大學(xué)碩士學(xué)位論文1.25GbpsEPON系統(tǒng)突發(fā)式接收模塊設(shè)計(jì)姓名：楊申申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：陳偉20050501武漢理工大學(xué)碩士學(xué)位論文AbstractRecentyears，withthedevelopmentoftheBroadband，EPON，asapracticalandeffectiveresolvingmethodtealizeFnWhasbeenstudiedlargelyButthe

2、receivingoftheopticalburstmodesignal，asthekeytechnologytealizetheEPONsystem。hasnotbeenresolvedwellnomatterinChinaorabroadThetraditionaryburstmodereceivertechnologyforlowerspeedsignalgenerallyappliesthemethodofDC—coupling

3、BecausethemethodofDC—couplingcouldreflectthechangeoftheburstsignalquicklyButfortheEPONburstsignalwhichspeedisasfastas125Gb／sbyDC—coupling，ontheonesideitmustsetuptheproperthresholdforthedifferentsignalpacketinsholterinter

4、val，ontheothersideitmustcouldresetthesignalleveltimelysothatitcouldreceivethefollowingsignalpacketwellTheseareboththetechnologyproblemtoforbidtheDC—couplingreceiving，sothatthechipforDC—couplingEPONburstreceivingstillhasn

5、otbeendesignedsuccessfullyBytheregulationoftheEPONprotocol8023ahdescribingthecharacteristicoftheEPONframeanddataformatdetailedlywedesignedtheEPONburst—modereceivermodulesuccessfullybythemethodofAC—couplingThispaperapplie

6、stwoschemestealizetheburst—modereceivermodule11lefirstscheme：usingthegeneralpreamplifierforreceivingtheconsecutivesignalInorderteflectfortheburstsignaltimelywediscardtheAGCcircuitinthechipThetestingresultshowsthatifwecho

7、osetheproperthecouplingcapacitance，wecouldreceivetheburstsignalcorrectlybythismethodAndthedynamicrangecouldreachabout15dBButbecausetheAGCloseitsfunction，ItishardtogethigheroverloadopticalpowerforthemoduleThesecondscheme：

8、applyingDCcancellationinthepreamplifierByfeedtheDCcomponentofthesignaloutofthetransimpedanceamplifierbacktotheinputofthepreamplifierwecouldcontrolthesignalcurrentflowingintothetransimpendancesothattheDCcomponentinthesign

9、aliscancelledAsaresultnomatterthehigherpoweropticalsignalorthelowpoweropticalsignal，theirDCcomponentsareonthesamelevelApplyingthescheme，theinfluenceonthereceivingcharacteristicfromthecouplingcapacitanceisless，sothatitmak

10、esthesensitivityofthemoduleimprovedlittleButtheoverloadopticalpowergetsimprovedlargelyItcouldreach—ldBmanddynamicrangereachesmorethan25dBInthemeantimethefactorswhichinfluencethesignalreceivingaredescribeddetalledlysnchas

11、jitterthevalueofQ，SNR，dataformatandguardingtimeandsoonTheresultshowedthattheopticalreceivermodule，whichwehaddesigned，hasveryhighsensitivityandwiderdynamicrangeThismodulecouldmeettheneedoftheEPONsystemThemethodofACcouplin