Iiparameters ezisisiseko zempawu zesignali yokukhanyaii-photodetectors:
Ngaphambi kokuhlola iintlobo ezahlukeneyo zee-photodetectors, qwalasela iimpawu zokusebenza kwe-izixhobo zokubona iifoto zesiginali yokukhanyazishwankathelwe. Ezi mpawu ziquka ukuphendula, impendulo ye-spectral, amandla alinganayo nengxolo (NEP), ukufumanisa okuthile, kunye nokufumanisa okuthile. D*), ukusebenza kakuhle kwe-quantum, kunye nexesha lokuphendula.
1. i-responsivity Rd isetyenziselwa ukuchaza uvakalelo lwempendulo yesixhobo kumandla emitha ye-optical. Imelwe ngumlinganiselo wesignali yokuphuma kwisignali yesiganeko. Olu phawu alubonisi iimpawu zengxolo zesixhobo, kodwa lubonisa kuphela ukusebenza kakuhle kokuguqula amandla emitha ye-electromagnetic ibe yi-current okanye i-voltage. Ke ngoko, inokwahluka ngokwe-wavelength yesignali yokukhanya kwesiganeko. Ukongeza, iimpawu zempendulo yamandla nazo zikwangumsebenzi we-bias esetyenzisiweyo kunye nobushushu obungqongileyo.
2. Uphawu lwempendulo ye-spectral luphawu oluchaza ubudlelwane phakathi kophawu lwempendulo yamandla lwe-optical signal detector kunye nomsebenzi we-wavelength ye-incident optical signal. Iimpawu zempendulo ye-spectral ze-optical signal photodetectors kwii-wavelengths ezahlukeneyo zihlala zichazwa ngokobuninzi "yi-spectral response curve". Kufuneka kuqatshelwe ukuba kuphela ziimpawu zempendulo ye-spectral eziphezulu kwi-curve ezilinganiswa ngexabiso elipheleleyo, kwaye ezinye iimpawu zempendulo ye-spectral kwii-wavelengths ezahlukeneyo zibonakaliswa ngamaxabiso aqhelekileyo asekelwe kwixabiso eliphezulu leempawu zempendulo ye-spectral.
3. Amandla alinganayo nengxolo ngamandla esignali yokukhanya kwesiganeko afunekayo xa i-voltage yesignali yokuphuma eyenziwe yi-optical signal detector ilingana nenqanaba le-voltage yengxolo engaphakathi kwesixhobo ngokwaso. Yinto ephambili emisela ubuncinci besignali ye-optical enokulinganiswa yi-optical signal detector, oko kukuthi, uvakalelo lokufumanisa.
4. Uvakalelo oluthile lokufumanisa luphawu oluchaza iimpawu ezisisiseko zezinto ezibonisa ukukhanya kwe-photosensitive ze-detector. Lumela uxinano oluphantsi kakhulu lwe-incident photon current olunokulinganiswa yi-optical signal detector. Ixabiso lalo linokwahluka ngokweemeko zokusebenza kwe-wavelength detector yesignali yokukhanya elinganisiweyo (njengobushushu obuphakathi, i-applied bias, njl.njl.). Okukhona i-bandwidth ye-detector inkulu, kokukhona inkulu indawo ye-optical signal detector, kokukhona incinci i-NEP yamandla alinganayo nengxolo, kwaye kokukhona iphakamileyo i-specific detection sensitivity. Uvakalelo oluphezulu lokufumanisa oluthile lwe-detector luthetha ukuba lufanelekile ukubhaqwa kwe-optical signals ezibuthathaka kakhulu.
5. Ukusebenza kakuhle kwe-Quantum Q yenye iparameter ebalulekileyo ye-optical signal detector. Ichazwa njengomlinganiselo wenani leempendulo "ezinokulinganiswa" eziveliswa yi-photomon kwi-detector ukuya kwinani le-photons ezenzekayo kumphezulu wezinto ezibona ukukhanya. Umzekelo, kwi-light signal detectors ezisebenza kwi-photon emission, ukusebenza kakuhle kwe-quantum ngumlinganiselo wenani lee-photoelectrons ezikhutshwa kumphezulu wezinto ezibona ukukhanya ukuya kwinani lee-photons zesignali elinganisiweyo eboniswe kumphezulu. Kwi-optical signal detector esebenzisa i-pn junction semiconductor material njengezinto ezibona ukukhanya, ukusebenza kakuhle kwe-quantum kwe-detector kubalwa ngokwahlula inani lee-electron hole pairs eziveliswa yi-light signal elinganisiweyo ngenani lee-incident signal photons. Enye indlela eqhelekileyo yokusebenzisa kakuhle kwe-quantum ye-optical signal detector kukusebenzisa i-detector's responsivity Rd.
6. Ixesha lokuphendula liyiparameter ebalulekileyo yokubonisa isantya sempendulo yesixhobo sokubona uphawu lwe-optical kutshintsho lobunzulu besignali yokukhanya elinganisiweyo. Xa isignali yokukhanya elinganisiweyo iguqulwa ibe yimo ye-pulse yokukhanya, ubunzulu besignali yombane ye-pulse eveliswa sisenzo sayo kwisixhobo sokubona kufuneka "inyuke" iye kwi "peak" ehambelanayo emva kwexesha elithile lokuphendula, kwaye ukusuka kwi "peak" ize ibuyele kwi "zero value" yokuqala ehambelana nesenzo se-pulse yokukhanya. Ukuze kuchazwe impendulo yesixhobo sokubona utshintsho lobunzulu besignali yokukhanya elinganisiweyo, ixesha apho ubunzulu besignali yombane eveliswa yi-incident light pulse inyuka ukusuka kwixabiso layo eliphezulu le-10% ukuya kwi-90% libizwa ngokuba "lixesha lokunyuka", kwaye ixesha apho i-waveform yesignali yombane ye-pulse iwa ukusuka kwixabiso layo eliphezulu le-90% ukuya kwi-10% libizwa ngokuba "lixesha lokuwa" okanye "lixesha lokubola".
7. Ulungelelwaniso lwempendulo lolunye uphawu olubalulekileyo oluchaza ubudlelwane obusebenzayo phakathi kwempendulo yesixhobo sokubona isignali yokukhanya kunye nobunzulu besignali yokukhanya elinganiswe ngesiganeko. Ifuna imveliso yeisixhobo sokubona isignali yokukhanyaukuba ilingane ngaphakathi koluhlu oluthile lobunzulu besignali ye-optical elinganisiweyo. Ngokuqhelekileyo kuchazwa ukuba ukuphambuka kwepesenti ukusuka kumgca wokufaka-wokuphuma ngaphakathi koluhlu oluchaziweyo lobunzulu besignali ye-optical ye-input kumgca wokuphendula wesixhobo sokubona isignali ye-optical.
Ixesha lokuthumela: Agasti-12-2024