简介：Inthispaper,theerenkovradiationoflightpulseinamicroringandgratingsissimulatedandinvestigated.Thesystemdesignconsistsofatwo-defectgratingincorporatingamicroring,connectedwithauniformgrating.Insimulation,thecontinuouswave(CW)lightpulsewithwavelengthcenteredat1.55μmisinputintothemicroringdeviceviathetwo-defectgrating.Theresonantoutputsfromthetwo-defectgratingpropagatethroughthemicroringanduniformgrating,wherethetimedelaysofthosetwoinputpulseswithdifferentwavelengthsthroughthesystemaredistinguishedbytheoutputuniformgrating.Fromtheobtainedresonantoutputpulses,wefindthatthered-shiftedandblue-shiftederenkovpulsesareobserved.Inapplications,suchaproposedsystemcanbeusedtoformtwodifferentopticaldelaypulses,inwhichthechangeinerenkovradiationofthem,i.e.,timedelaywithinamicroringdevicesystem,canbeusefulforerenkovradiationimagingandsensingapplications.

简介：Inordertominimizethetransmittedpowerinthemulti-userorthogonalfrequencydivisionmultiplexing(OFDM)system,aschemecombiningtheimprovedparticleswarmoptimization(POS)algorithmwithgeneticalgorithm(GA)isproposedtooptimizethesub-carriersandbitsallocation.Inthealgorithm,arandomvelocitybetweenthemaximumandminimumparticlevelocityisusedastheupdatingvelocityinsteadofmaximumorminimumvelocitywhentheupdatedparticlevelocityishigherthanthemaximumparticlevelocityorlowerthantheminimumparticlevelocity.Then,theconvergencepopulationisusedastheinitialpopulationofthegeneticalgorithmtooptimizethesubcarriersandbitsallocationfurther.Simulationresultsshowthatthetransmittedpoweroftheproposedalgorithmisabout2dBto10dBlowerthanthatofthegeneticalgorithm,particleswarmoptimizationalgorithm,andZhang’salgorithm.

简介：一面非线性的光环镜子(NOLM)基于线性洞可切换的多波长做耳的纤维(EDF)激光被建议并且试验性地示威了。由于紧张依赖者transmissivity的特征，NOLM能有效地减轻同质的拓宽获得媒介的模式比赛，以便放射激光的多波长能在房间温度被完成。由调整极化控制器(PC)的状态，在建议激光罐头的放射激光的波长的数字在1530nm的波长附近与0.4nm的波长间距从11～13灵活地被调整。