光控雙波長THz波光子晶體調(diào)制器特性研究.pdf

1、南京郵電大學(xué)碩士學(xué)位論文光控雙波長THz波光子晶體調(diào)制器特性研究姓名：徐妍申請學(xué)位級別：碩士專業(yè)：光學(xué)工程指導(dǎo)教師：陳鶴鳴201103南京郵電大學(xué)碩士研究生學(xué)位論文AbstractIIAbstractNowadaysinthetimesofinfmationexplosionthedemfbwidthindatacommunicationisgrowingrapidly.Theradiofrequencyresourcewhichcov

2、ersthespectrumwindowbelow300GHzhasbeenexhaustedsotheTerahertzrange(100GHz~10THz)isthelastremainingfrequencygap.thetrendofapplyingittothefuturewirelesscommunicationstosolvetheproblemofhighspeedultrabroadbwirelessaccesscon

3、nectionisinevitable.AsakeyelementinfutureterahertzwirelesscommunicationsystemsTHzwavemodulatisattractingextensiveinvestigationsamongscholarsdomesticabroad.Meanwhileasanewkindofmaterialthephotoniccrystaliswidelyusedtofabr

4、icatemodulatsswitchesfiltersotherfunctionaldevicesinopticalcommunicationsystems.ThecombinationofTHztechnologyphotoniccrystal(PC)technologyprovidesanewapproachtodesigningthenovelTHzwavemodulat.ThestudyontheTHzwavemodulatw

5、illfurtherpromotethedevelopmentoftheterahertzcommunicationtechnology.AtpresentmostoftheTHzwavemodulatsbasedonphotoniccrystalsonlycanachievethemodulationofTHzwavewithonewavelengthmostofthesemodulatsusematerialswithslowres

6、ponsetimesuchasliquidcrystal.TheselimittheapplicationsoftheTHzwaveinthehighspeedcommunicationsystem.TomeettheneedofhighspeedultrawidebTHzwavecommunicationsystemdevelopmentsothattheTHzwavemodulatwithhighmodulationratelowi

7、onlosscanachievetwowavelengthmodulationthispaperpresentsanewtypeofopticalcontroltwowavelengthTHzmodulatbasedonnonlinearphotoniccrystal.Itwksintheteraherzbhaspracticalvalues.Thispaperfirstlydescribesthemechanismsofmodulat

8、ingtheonoffstateoftheTHzwavebyusingthePCespeciallydiscussingtherealizationofdefectmodeshiftdefectmodechangemechanismsbyPC.ThendesigningdiscussingthematerialaswellasthestructureofPCfinallyitisfoundthatthesidecoupledstruct

9、urewiththecombinationofpointdefectslinedefectshasthebettermodulationperfmance.OnthebasisofthestructuraldesignbyintroducinganewkindofopticalcontrolnonlinearmaterialGaAswhichhastherapidnonlinearresponsetimetwokindsofTHzmod