简介：Themicrowavephotonicfilters(MPFs)basedonseriallycoupledsiliconmicroringresonators(MRRs)aretheoreticallyanalyzedfortheapplicationof60-GHzmillimeterwavewirelesspersonalareanetworks.Thisisachievedbycalculatingtheimprovementofbiterrorratio(BER).Accordingtothesimulationresults,therequirementofsignal-to-noiseratio(SNR)ofthereceiveddatacanbereducedby14dBforthesameBERwithandwithoutMPFs.TheperformanceoftheMPFwithfiveseriallycoupledmicroringstructuresisbetterthanthatoftheMPFwithasinglemicroring,owingtotheimprovementoftheshapefactor.

简介：血片镜检可以实现白细胞的分类计数,同时还能提供详细的白细胞形态等特征,有助于疾病的诊断。目前国内大多数医院白细胞检测的主要方法是人工镜检,但人工镜检依赖医务人员的工作经验,劳动强度大,检测效率低。因此提出一种基于RGB彩色空间分量差的白细胞细胞核的快速分割方法。通过显微镜分析人体外周血液涂片的显微图像,发现白细胞细胞核区域的B分量和G分量的差值明显比其他区域大,可以通过一个简单8bit的B-G运算,来实现五类白细胞细胞核的快速分割,白细胞细胞核的平均分割时间为0.26ms,体现了较好的鲁棒性和实时性。该方法成功应用到白细胞的实时在线自动扫描镜检中,提高了镜检的效率。

简介：Aweakinfrared(IR)imageamplifierwithmorethan60-dBopticalgainandfrequencyup-conversionisdevelopedfromapicosecond(PS)355-nmpumpedgatedopticalparametricamplifier(OPA)inaβ-BaB2O4(BBO)crystal.TheIRimageat1064nmisamplifiedandup-convertedintothevisibleregionat532nmbyparametricamplificationandup-conversion.Withtheoptimizedopticalgain,thelowestdetectableenergyoftheimagecanbeaslowas1.8femto-Jouleperpulse,whichisthreeordersofmagnitudelowerthanthedetectionlimitofacharge-coupleddevice(CCD)camera.ThetransversalresolutionoftheOPAimagingisinvestigated,andtheapproachesforhigherdetectionsensitivityandhighertransversalresolutionareproposed.

简介：Real-timevideostreamingusingultra-wideband(UWB)technologyisexperimentallydemonstratedalonglong-reachpassiveopticalnetworks(LR-PONs)withdifferentwiredandwirelessreaches.ExperimentaltestsusingexternalanddirectmodulationwithUWBwirelessradiationinthe10-and60-GHzbandsareperformed.Anultra-bendablefiberisalsoconsideredforalast-miledistribution.ThevideoqualityattheoutputoftheopticalfiberinfrastructureoftheLR-PONisassessedusingtheerrorvectormagnitude(EVM),andthelinkqualityindicator(LQI)isusedasafigureofmeritafterwirelessradiation.AnEVMbelow–17dBisachievedforbothexternallyanddirectlymodulatedLR-PONscomprisingupto125kmofopticalfiber.EVMimprovementisobservedforlongerLR-PONswhendirectlymodulatedlasers(DMLs)areusedbecauseoftheamplitudegainprovidedbythecombinedeffectofdispersionandDML’schirp.Comparedwithopticalback-to-backoperation,theLQIleveldegradestothemaximumaround20%forLR-PONsrangingbetween75and125kmoffiberreachandwithawirelesscoverageof2minthe10-GHzUWBband.ThesamelevelofLQIdegradationisobservedusingthe60-GHzUWBbandwithaLR-PONintegrating101kmofaccessnetwork,alast-miledistributionusingultra-bendablefiber,anda5.2-mwirelesslink.