简介：Fromanordinarycondition,usingafullthree-dimensionalmodeltheoryandaninfiniteperturbationexpansionmethod,anexactsolutionofthere-flectioncoefficientforthecoatednarrowstripe-geometryopticalwaveguidedeviceshasbeenderived.Allsixcomponentsandthevectorpropertyoftheelectroma-gneticfieldhavebeenconsidered.Theresultsaresuitableforthesymmetricandasymmetricwaveguides.

简介：ThelifeofimpregnatedBa-Wcathodeswithanewconstructionhavebeenevaluatedusinganacceleratedlifetestatthreedifferenttemperatures(1170℃,1130℃,1090℃)andconstantcurrentdensity(2A/cm~2).Accordingtotherelationshipoflifewithoperatingtemperatures,anacceleratedequationhasbeensetup.Thecathodelifeatnormaloperatingtemperatureisdeductedbasedontheacceleratedequation.Theresultsshowthatlifeofthenovelcathodeexceeds190,000houratacurrentdensityof2A/cm~2.

简介：Thetransmissionspectrumofthecoatedphase-shiftedlong-periodfibergratings(LPFGs)withsingleandmultiplephaseshiftsisanalyzedbythecoupled-modetheoryandthetransfermatrixmethod,andtheinfluencesofthefilmparametersonthespectralcharacteristicsarealsostudied.ItisshownthattheseparameterswillaffecttheLPFGfilteringcharacteristics.Thelosspeakoftransmissionspectrumdecreaseswiththeincreaseoffilmthickness,andthepeakpositionshiftswiththefilmrefractiveindex.Comparedwiththenon-coatedphase-shiftedLPFG,thecoatedonehasthesimilardesirablefilteringcharacteristics,andithasaflexibleabilitytoadjustthetransmissionproperties.

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