可见光通信日本庆应义塾大学成果展示.pdf

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1、2007October25VisibleLightCommunicationsMasaoNakagawaKeioUniversityVisibleLightCommunicationConsortiumＭ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．11WavesforWirelessCommunicationsLowfrequency(longwavelength)RadiowaveInfraredVisibleLightUltravioletHighfrequency(shortwavelength)Ｍ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．22NewLigh

2、tSourceＬＥＤTrafficsignalＬＥＤtaillampＭ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．3ＬＥＤspotlightmodulatedbymusicＬＥＤspotlightmodulatedbypositiondataＭ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．4NewwhitelightsourceusingＬＤ（LaserDiode）FiberBlueLDFluorescentmaterialＭ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．5LuminousEfficiency(lm/w)inLED200150Dischargelamp100F

3、luorescentlight5001960198020002020YearＭ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．6NormalizedMagnitudeResponseofWhiteLED(dB)0-3dB-5-10-152MHz-20Ｍ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．7FluorescentBlueLEDWhitematerialLightSeveraltenSeveralmega-mega-HertzHertzMechanismofwhiteLEDresponseＭ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．8Twomechanismsforil

4、luminatingwhite(1)WhiteLEDusingfluorescentmaterial(2)Mixedthreecolors(RGB)Ｍ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．9ThreeColors=WhiteThreecolorLEDhasgoodfrequencyresponseandcanchangeitscolor.However,itneedsthreeLEDelectrodes.BlueGreenRed450550650nm（wavelength）Ｍ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．10WhiteLEDoffluoresce

5、ntmaterialdrivenbyblueLEDBlueYellowfluorescent450550650nm（wavelength）Ｍ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．113.HistoryofVisibleLightCommunicationsPhotophonebyGrahamBellin1880ThefirstexperimentofVisibleLightCommunicationswasdonebyGrahamBellwhosesystemwascalledPhotophone.Helovedtheidea.Thispictureis

6、fromthewebsiteofBellLaboratorieswhoseexperimentshowed200mdistancevoicecommunication.Ｍ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．12MorsecodedlightRadiocanbeeavesdroppedbyhostilewarshipsorairplanes.Lightcanbehardlydone.Security:NoeavesdropPositioning:TofindthepositionofthegroupshipMulti-function:Searchlig

7、htandcommunicationbothＭ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎｉｖ．134.RadioWaveMobileRadioTVPhone3kHz３０ｋHz300kHz３MHｚ３０MHｚ３００MHｚ３GHｚVLFLFMFHFVHFUHFRadiowave3GHz３０GHz300GHz３THｚ３０THｚ３００THｚ３PHｚFarinfra-redNearinfra-redVisibleλ：10ｃm1cm1mm0.1mm0.01ｍm1μmlightSub-millimeterwaveLightwave4GMobileＭ．Ｎａｋａｇａｗａ,ＫｅｉｏＵｎ

8、ｉｖ．14TelephoneWiredCommunicationsEvery-h