Taw qhia InGaAs photodetector

Qhia tawmInGaAs photodetector

InGaAs yog ib qho ntawm cov ntaub ntawv zoo tshaj plaws rau kev ua tiav cov lus teb siab thiablub tshuab ntes duab ceev ceevUa ntej, InGaAs yog cov khoom siv semiconductor bandgap ncaj qha, thiab nws qhov dav bandgap tuaj yeem tswj tau los ntawm qhov sib piv ntawm In thiab Ga, ua rau pom cov teeb liab optical ntawm ntau qhov wavelengths. Ntawm lawv, In0.53Ga0.47As zoo kawg nkaus phim nrog InP substrate lattice thiab muaj cov coefficient nqus teeb pom kev zoo heev hauv cov kab sib txuas lus optical. Nws yog qhov siv dav tshaj plaws hauv kev npaj ntawmlub tshuab ntes duabthiab kuj muaj qhov tsaus ntuj tam sim no thiab kev ua haujlwm zoo tshaj plaws. Qhov thib ob, ob qho tib si InGaAs thiab InP cov ntaub ntawv muaj qhov ceev ntawm electron drift siab, nrog rau lawv cov electron drift velocities saturated ob qho tib si kwv yees li 1 × 107cm / s. Lub caij no, nyob rau hauv cov teb hluav taws xob tshwj xeeb, InGaAs thiab InP cov ntaub ntawv qhia txog electron velocity overshoot effects, nrog rau lawv cov overshoot velocities ncav cuag 4 × 107cm / s thiab 6 × 107cm / s feem. Nws yog qhov ua rau kom ua tiav qhov crossing bandwidth siab dua. Tam sim no, InGaAs photodetectors yog cov photodetector tseem ceeb tshaj plaws rau kev sib txuas lus optical. Hauv kev ua lag luam, txoj kev sib txuas ntawm qhov chaw yog qhov feem ntau. Cov khoom ntes qhov chaw nrog 25 Gaud / s thiab 56 Gaud / s twb tuaj yeem tsim tau ntau lawm. Cov khoom ntes qhov chaw me dua, rov qab-xwm txheej, thiab cov bandwidth siab kuj tau tsim, feem ntau rau cov ntawv thov xws li kev kub ceev thiab siab saturation. Txawm li cas los xij, vim muaj kev txwv ntawm lawv cov txheej txheem sib txuas, cov khoom siv ntes qhov chaw nyuaj rau kev sib koom ua ke nrog lwm cov khoom siv optoelectronic. Yog li ntawd, nrog rau qhov kev thov nce ntxiv rau kev sib koom ua ke optoelectronic, waveguide coupled InGaAs photodetectors nrog kev ua tau zoo heev thiab tsim nyog rau kev sib koom ua ke tau maj mam dhau los ua qhov tseem ceeb ntawm kev tshawb fawb. Ntawm lawv, kev lag luam InGaAs photodetector modules ntawm 70GHz thiab 110GHz yuav luag txhua tus txais yuav cov qauv sib txuas waveguide. Raws li qhov sib txawv ntawm cov ntaub ntawv substrate, waveguide coupled InGaAs photodetectors tuaj yeem faib ua ob hom: INP-based thiab Si-based. Cov khoom siv epitaxial ntawm InP substrates muaj qhov zoo thiab tsim nyog dua rau kev tsim cov khoom siv ua tau zoo. Txawm li cas los xij, rau III-V pawg ntaub ntawv cog lossis sib txuas ntawm Si substrates, vim muaj ntau yam tsis sib xws ntawm InGaAs cov ntaub ntawv thiab Si substrates, cov khoom siv lossis interface zoo tsis zoo, thiab tseem muaj chaw ntau rau kev txhim kho hauv kev ua tau zoo ntawm cov khoom siv.

Qhov ruaj khov ntawm photodetector hauv ntau qhov chaw siv, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej hnyav, kuj yog ib qho ntawm cov yam tseem ceeb hauv kev siv tswv yim. Nyob rau hauv xyoo tas los no, cov hom tshiab ntawm cov khoom siv ntes xws li perovskite, cov khoom siv organic thiab ob-seem, uas tau nyiam ntau qhov kev saib xyuas, tseem ntsib ntau yam teeb meem hauv kev ruaj khov mus sij hawm ntev vim qhov tseeb tias cov ntaub ntawv lawv tus kheej yooj yim cuam tshuam los ntawm cov yam ntxwv ib puag ncig. Lub caij no, cov txheej txheem kev koom ua ke ntawm cov ntaub ntawv tshiab tseem tsis tau loj hlob, thiab kev tshawb nrhiav ntxiv tseem xav tau rau kev tsim khoom loj thiab kev ua tau zoo sib xws.

Txawm hais tias kev qhia txog cov inductors tuaj yeem ua rau kom muaj bandwidth ntawm cov khoom siv tam sim no, nws tsis nrov hauv cov tshuab sib txuas lus digital optical. Yog li ntawd, yuav ua li cas kom tsis txhob muaj kev cuam tshuam tsis zoo kom txo qis cov parasitic RC parameters ntawm lub cuab yeej yog ib qho ntawm cov lus qhia tshawb fawb ntawm high-speed photodetector. Qhov thib ob, raws li bandwidth ntawm waveguide coupled photodetectors khaws cia nce ntxiv, qhov kev txwv ntawm bandwidth thiab responsivity pib tshwm sim dua. Txawm hais tias Ge / Si photodetectors thiab InGaAs photodetector nrog 3dB bandwidth tshaj 200GHz tau tshaj tawm, lawv cov responsivities tsis txaus siab. Yuav ua li cas kom nce bandwidth thaum tswj hwm qhov responsivity zoo yog ib qho tseem ceeb tshawb fawb, uas yuav xav tau kev qhia txog cov txheej txheem tshiab-compatible cov ntaub ntawv (high mobility thiab high absorption coefficient) lossis cov qauv tshiab high-speed device los daws. Tsis tas li ntawd, raws li cov cuab yeej bandwidth nce ntxiv, cov ntawv thov scenarios ntawm detectors hauv microwave photonic links yuav maj mam nce ntxiv. Tsis zoo li qhov me me optical fais fab incidence thiab high-sensitivity detection hauv optical kev sib txuas lus, qhov xwm txheej no, ntawm lub hauv paus ntawm high bandwidth, muaj lub zog saturation siab rau high-power incidence. Txawm li cas los xij, cov khoom siv high-bandwidth feem ntau siv cov qauv me me, yog li nws tsis yooj yim los tsim cov photodetectors ceev thiab siab-saturation-power, thiab ntxiv cov kev tsim kho tshiab yuav tsum tau nyob rau hauv lub carrier extraction thiab cua sov dissipation ntawm cov khoom siv. Thaum kawg, txo qhov tsaus ntuj tam sim no ntawm cov khoom siv ceev ceev tseem yog ib qho teeb meem uas cov photodetectors nrog lattice mismatch yuav tsum daws. Tsaus ntuj tam sim no feem ntau yog cuam tshuam nrog qhov zoo ntawm crystal thiab qhov xwm txheej ntawm cov khoom siv. Yog li ntawd, cov txheej txheem tseem ceeb xws li high-quality heteroepitaxy lossis bonding nyob rau hauv lattice mismatch systems xav tau kev tshawb fawb thiab kev nqis peev ntau dua.