简介:A10Gbit/srecirculatingsystemisconfiguredwithChirpedFiberBraggGrating(CFBG)forthedispersioncompensation.Forthefirsttime,thetransmissiondistanceintheloopreaches1000kmwithbiterrorrateof10-9.Theeffectofthegroupdelayrippleofthefibergratingisalsoinvestigatedintherecirculatingsystems,anditisshownthatthetransmissiondistanceislimitedto4cycles(4×167.1km)intheloopwiththepowerpenaltyfluctuationbelow1.0dB.Thusthegroupdelayrippleshouldbereducedtoallowforthewavelengthdriftof±5GHz.Attheendofthisletter,theprinciplesaregivenfordesigninglonghaulrecirculatingsystemswithdispersioncompensationCFBG.
简介:Anultra-highspeed1:2demultiplexerforopticalfibercommunicationsystemsisdesignedutilizingtheIHP0.25μmSiGeBiCMOStechnology.Thelatchofthedemultiplexercorecircuitisresearched.Basedonthecurrentmeasurementcondition,ahigh-gainandwide-bandwidthclockbufferisdesignedtodrivelargeload.Transmissionlinetheoryforultra-highspeedcircuitsisusedtodesignmatchingnetworktosolvethematchingproblemamongtheinput,outputandinternalsignals.Thetransientanalysisshowsthatthisdemultiplexercandemultiplexone100Gb/sinputintotwo50Gb/soutputs.Thechipareaofitis0.7mm×0.47mm,theinputandoutputdataarebothat400mVP-PPCMLstandardvoltagelevel,andthepowerconsumptionoftheICis900mWatthepowersupplyof-4V.
简介:Thispaperpresentsthedesignandsimulationofseveralfixed-tunedsub-harmonicmixerscoverfrequenciesfrom110GHto130GHz,215GHto235GHz,310GHto350GHz,and400GHto440GHz.Amongthem,120GHz,225GHz,330GHzsubharmonicmixersaredesignedwithflip-chippedplanarschottkydiodemountedontoasuspendedquartz-basedsubstrate,the225GHzand425GHzsubharmonicmixersareGaAsmembraneintegrated,andthe115GHzsubharmonicmixerhasbeenfabricatedandtestedalready.
简介:G3时代.Powerbook系列就在款型方面创造了一次惊喜,它们像苹果的台式机一样“精而少”。G4时代同样秉承了苹果的靓酷风格,早期推的25寸Powerbook.外壳是一层薄钛金属镀膜.人们喜欢称其
简介:Digitalsignatureisoneofthemostimportantcryptographicprimitives.WeproposedanewdigitalsignatureschemebasedonCatalano’strapdoor.SinceCatalano’strapdoorismoreefficientthanexistingtrapdoorsinnumbertheory,ourschemeneednotmodularexponentiationbutseveralmodularmultiplicationsinthesigningalgorithm.Wealsoprovedourschemeisprovablysecureagainstadap-tivelychosenmessageattackbyusingtheForkinglemma.
简介:CRTCornercuttingtubeisconsideredasadefinitiverejectandwillbesenttoreclaimatalltimes.Itcausedlotsofmaterialloss.Inthispaper,anoveltechnologyusedtosaveCRTscornercuttingtubeispresentedfirstly.AsetofrepairsystemhasbeensuccessfullydevelopedtorepairCRTscornercuttingtube.Then,theprocesstechnologyforcornercuttingrepairhasbeenexcogitatedbyempiricalstudies.Finally,thecorrelativeperformancesofrepairedtubeareevaluated.Theexperimentalresultsshowthatthequalityofrepairedtubehasnodifferencewiththatofnormalproduct.Therepairyieldhasreachedabove97percent.Thisnewtechnologyhascontributedtoimprovingtheproductionyield,reducingthematerialconsumptionanddecreasingthecostofcolorCRTproduction.
简介:Thisletterintroducesthedesignideas,simulationandtestresultsofanS-bandklystronwithbandwidthof11%,whichwasdevelopedbytheInstituteofElectronics,ChineseAcademyofSciences(IECAS).Onthepeakpowerlevelof800kW,theefficiencyofklystronismorethan30%;thegainismorethan41dB;theequal-drivingrelativeinstantaneousbandwidthisover11%;theaveragepowerislargerthan8kW,andthepowerfluctuationwithinbandwidthislessthan1.5dB.
简介:ThecharacteristicofEDFAinWDMsystemisanalyzed.ThesimulationsystembasedonthearchitectureoftheChinaInformationNetwork(CAINONET)isintroduced,andtheinfluenceofnoisefigure,gainunflatnessandoutputpowerofEDFAontheBERperformanceandscaleofnetworkisinvestigated.Moreover,theinfluenceofnoisefigureisstudiedwithdifferentcrosstalk.Meanwhile,itisindicatedthatitisimportanttoapplythe"nodeisolationprinciple"intheopticalnetwork.Theresearchresultscanprovidethevaluablereferenceforthepracticalconstructionofallopticalnetwork.