Lub avalanche photodiode yog tsim los ntawm Japanese engineer" Jun-ichi Nishizawa" Nyob rau hauv 1952. Lub avalanche photodiode yog ib tug rhiab heev semiconductor ntes uas siv cov nyhuv photoelectric hloov lub teeb rau hauv hluav taws xob.
Hauv kev sib txuas lus fiber ntau optic, ib qho khoom siv xws li avalanche photodiode yog siv los hloov lub teeb rau hauv lub teeb liab hluav taws xob. Thaum lub sij hawm avalanche txheej txheem, tus nqi thauj khoom yog tsim los ntawm kev sib tsoo. Lub teeb particle zoo li photons tsim ntau electrons, uas nyob rau hauv lem tsim hluav taws xob tam sim no.
Dab tsi yog avalanche photodiode
Lub diode uas siv txoj kev avalanche los muab kev ua tau zoo ntxiv piv rau lwm cov diodes yog hu ua avalanche photodiode.
Avalanche photodiodes hloov lub teeb liab kho qhov muag rau hauv lub teeb liab hluav taws xob thiab tuaj yeem ua haujlwm ntawm qhov siab rov qab tsis zoo voltages. Lub cim rau lub avalanche photodiode zoo ib yam li Zener diode.
Avalanche Photodiode Structure
Tus qauv ntawm tus PIN photodiode thiab avalanche photodiode zoo ib yam thiab muaj ob thaj chaw hnyav hnyav thiab ob thaj chaw me me doped, thaj chaw hnyav hnyav yog P+ thiab N+, thaum thaj chaw me me doped yog Kuv thiab P.
Nyob rau hauv lub intrinsic cheeb tsam, depletion txheej dav ntawm lub avalanche photodiode yog nyias nyias piv rau tus PIN photodiode. Ntawm no, thaj tsam p+ ua zoo li anode, thaum lub cheeb tsam n+ ua zoo li cathode.
Piv rau lwm cov photodiodes, avalanche photodiodes ua haujlwm nyob rau hauv siab rov qab tsis zoo. Yog li ntawd, lub avalanche yog multiplied los ntawm tus nqi nqa khoom tsim los ntawm lub teeb impingement los yog photons. Qhov kev txiav txim avalanche nce qhov nce ntawm photodiode los ntawm qhov tseem ceeb ntawm ntau yam los muab qhov siab rhiab heev.
Cov txheej txheem ua haujlwm
Avalanche tawg feem ntau tshwm sim thaum lub photodiode raug rau qhov siab tshaj qhov rov qab voltage uas txhim kho lub teb hluav taws xob dhau ntawm txheej depletion. Raws li qhov teeb meem teeb meem nkag mus rau thaj tsam p+, nws tau nqus rau hauv thaj tsam p heev thiab tom qab ntawd tsim cov khoom siv hluav taws xob-qhov.
Ntev npaum li qhov chaw hluav taws xob siab tam sim no, cov neeg nqa khoom them nqi suav nrog lawv qhov kev nrawm nrawm nrawm mus rau thaj tsam pn+. Thaum lub nrawm tshaj plaws, cov cab kuj yuav sib tsoo los ntawm lwm cov atoms thiab tsim cov khoom siv hluav taws xob tshiab-qhov, thiab cov khoom thauj loj loj yuav ua rau cov photocurrents siab.
Avalanche photodiode ua haujlwm
Avalanche photodiode kev ua haujlwm tuaj yeem ua tiav hauv dekev xaiv hom. Txawm li cas los xij, ntxiv rau hom kab tawm avalanche, lawv tuaj yeem ua haujlwm hauv Geiger hom. Nyob rau hauv hom kev ua haujlwm no, lub photodiode tuaj yeem ua haujlwm ntawm cov lus hais saum toj no. Lwm hom," sub-Geiger hom", tam sim no tau qhia.
Avalanche photodiodes nyob rau hauv fiber optic kev sib txuas lus
Hauv kev sib txuas lus fiber ntau optical (OFC) systems, avalanche photodiodes feem ntau yog siv rau cov teeb liab tsis muaj zog, tab sis lub Circuit Court yuav tsum tau ua kom zoo txaus kom ua tiav cov teeb liab-rau-suab nrov piv (S / N). Ntawm no, SNR yog kom tau txais qhov zoo tshaj plaws teeb liab-rau-suab nrov piv thiab quantum efficiency yuav tsum siab vim hais tias tus nqi no yuav luag qhov siab tshaj plaws, yog li ntawd feem ntau ntawm cov teeb liab pom.
Avalanche photodiode yam ntxwv
Avalanche photodiodes yog cov rhiab heev, high-speed raws li diodes uas ua hauj lwm los ntawm kev siv ib tug thim rov qab voltage rau lub internal nce txoj kev. Cov diodes ntsuas lub teeb qis qis piv rau PIN hom photodiodes thiab yog li siv rau hauv cov ntawv thov uas muaj qhov sib txawv ntawm qhov sib txawv, xws li ntsuas qhov ntsuas qhov deb thiab qhov ntev ntawm kev sib txuas lus kho qhov muag.
Tsis lees paub:Kab lus no yog ib tsab xov xwm luam tawm hauv network, lub hom phiaj ntawm kev tsim cov kab lus no yog txhawm rau tshaj tawm cov kev paub txog kev txawj ntse, kev cai lij choj yog tus thawj kws sau ntawv, yog tias muaj kev cuam tshuam, thov hu rau tus editor kom tshem tawm.