预览加载中，请您耐心等待几秒...

基于PIN光电二极管的光功率计.docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

基于PIN光电二极管的光功率计 Abstract Astechnologyadvances,photodiodesarebecomingcrucialformanyopto-electronicapplications.Photodiodesareimportantinmeasuringopticalpower,astheyareusedinlightdetectorsoropticalpowermeters.Inthispaper,wefocusonthepinphotodiode,oneofthemostcommonlyusedphotodiodesforopticalpowerdetection.Wewilldiscusstheprincipleofoperation,itsproperties,andhowitisusedinopticalpowermeasurements. Introduction Opticalpoweristhemeasurementofenergyfromlightsources.Itisimportantinmanyapplicationssuchastelecommunications,industrialautomation,andscientificresearch.Thepinphotodiodeisacommondeviceusedinmeasuringopticalpower.Itsstructureconsistsofthreelayers:thep-layer,thei-layer,andthen-layer.Thei-layeristheintrinsiclayer,whichsignifiesthatithasnodoping.Thislayeriswherethelightisdetected,andtheelectricalsignalisproducedwhenlightisabsorbed.Thep-layerisdopedwithamaterialthathasmanyholes,whilethen-layerisdopedwithamaterialthathasmanyelectrons. PrincipleofOperation Whenlightfallsonthesensor,thephotonsexcitetheelectronsinthei-layerandpromotethemtotheconductionband.Asaresult,theelectronsgainenergyandgothroughthedepletionregion,whichseparatesthep-layerandthen-layer.Thedepletionregionhasnochargecarriers,whichcreatesapotentialdifferencebetweenthetwolayers.Theelectricfieldinthedepletionregionseparatestheelectronsandholeswhentheymovetowardstheoppositeendsofthephotodiode.Thisseparationresultsinaphotocurrentflow,whichcanbemeasuredastheoutputofthephotodiode. Thepinphotodiodehashighquantumefficiency,whichdenotestheratioofthenumberofphotonsabsorbedtothenumberofelectronsgenerated.Quantumefficiencydependsonthewavelengthoflightandthematerialused.Thewavelengthoflightshouldbelessthanthebandgapofthematerial,sothatthephotonscangenerateelectron-holepairs.Thepinphotodiodehashighsensitivitybecauseofitslargedepletionregion. PropertiesofthePINPhotodiode ThePINphotodiodehasseveralpropertiesthatmakeitsuitableforuseinopticalpowermeasurement.Oneofthemostimportantpropertiesisitsspeed.ThePINphotodiodecandetec