简介:Transmissionperformanceofelectroabsorptionmodulatorin10Gb/stransmissionsystemshasbeensimulatedandanalyzedundertheconditionoftakingintoaccountthechirp,extinctionratio,transmissivityandrise/falltime.ResultsshowthatshorttransmissiondistancewithoutEDFAafterEAMcanbeusedinfuturemetropolitanareanetwork,butthetransmissivitymustbecarefullyconsidered.Thesamplingtimerangeanddecisionlevelcanbeoptimizedtoreducethebiterrorratio.
简介:Inrecentyears,thepotentialofrenewablegreenenergysourceshasbeenextensivelystudied.Theproventechnologywhichisphotovoltaicsolarcellsstrictlydependsondaylightandproduceslow-efficiently.Toovercometherestrictions,onetechnologystudiedisthroughharvestingthethermalradiationenergywhichcanprovidea24-hourenergysource.Thecontinuityofenergysourcespromisesverygoodenergyconversionespeciallyformilitaryapplications.Thisarticlepresentsanewstructurethatcanharvesttheabundantthermalradiationenergyintousableenergyatthewavelengthof10μm.Arectangularstructurewithaperturbationslitwasdesignedtointegratewitharectifiercircuitforgreenenergyconversion.Theslittunneljunctionguidedtheelectromagneticfieldintoajunctionwheretheenergycouldbecollectedandconverted.Anenhancementfactorofapproximately110.6canbeachievedbyaperturbationslitlengthof1.0μm.Theresultsextractedfromtheproposeddesignpromiseabettercandidatetoovercomethedisadvantagesofphotovoltaicsolarcellsforenergyharvestingdevices.
简介:<正>信息产业部政策法规司副司长郭福华日前表示。信息产业部正在制定一个中国信息产业的发展目标,计划在5~10年内将中国建成"世界电子信息产业基地"。郭福华表示,目前IT业在珠江三角洲、长江三角洲、环渤海湾等沿海地区已经出现了集约化的趋势。曾有外国厂商预言,东莞至广州的交通一旦瘫痪,全世界的电脑厂商的生产都会处于停顿状态。这足以说明中国IT产业在世界的地位。郭福华认为,中国发展IT产业目前有三大优势。一是发达国家的电子信息产业不断向劳动生产成本较低的中国转移,二是十六大已经明确提出国家要大力推动信息化建设,三是加入WTO后,国内厂商可以同等的身份进入国际市场竞争。