Iimpawu ezisisiseko zeempawu zesiginali ye-opticalii-photodetectors:
Ngaphambi kokuphonononga iindlela ezahlukeneyo ze-photodetectors, iimpawu zeempawu zokusebenza zokusebenzai-optical signal photodetectorszishwankathelwa. Ezi mpawu ziquka ukuphendula, impendulo ye-spectral, amandla alinganayo ingxolo (NEP), ukukhangela okuthe ngqo, kunye nokukhangela okuthile. D *), ukusebenza kakuhle kwe-quantum, kunye nexesha lokuphendula.
1. Responsivity Rd isetyenziselwa ukubonisa uvakalelo lokuphendula lwesixhobo kumandla okukhanya kwemitha. Imelwe ngumlinganiselo wesignali yemveliso kwisignali yesiganeko. Olu phawu alubonisi iimpawu zengxolo zesixhobo, kodwa kuphela ukusebenza kakuhle kokuguqula amandla emitha ye-electromagnetic abe yangoku okanye amandla ombane. Ngoko ke, inokwahluka kunye nobude besibonakaliso sokukhanya kwesiganeko. Ukongeza, iimpawu zokuphendula amandla nazo zingumsebenzi we-bias esetyenzisiweyo kunye nobushushu be-ambient.
2. Uphawu lwempendulo ye-spectral yiparameter ebonisa ubudlelwane phakathi kweempawu zokuphendula amandla kwi-detector ye-optical signal kunye nomsebenzi we-wavelength wesiganeko se-optical signal. Iimpawu zempendulo ye-spectral ye-optical signal photodetectors kwii-wavelengths ezahlukeneyo zidla ngokuchazwa ngokobuninzi "yi-spectral response curve". Kufuneka kuqatshelwe ukuba kuphela iimpawu eziphezulu zokuphendula kwi-spectral kwi-curve zilinganiswe ngexabiso elipheleleyo, kwaye ezinye iimpawu zempendulo ye-spectral kwii-wavelengths ezahlukeneyo zibonakaliswa ngamaxabiso aqhelekileyo ahambelanayo asekelwe kwixabiso eliphezulu leempawu zempendulo ye-spectral.
3. Amandla alingana nengxolo sisiganeko samandla ombane wokukhanya afunekayo xa umbane wesignali ophumayo oveliswe sisitshina somqondiso we-optical optical ulingana nomgangatho wombane wengxolo okhoyo wesixhobo ngokwaso. Yeyona nto iphambili emisela ubuncinci besignali ye-optical intensity enokulinganiswa yi-optical signal detector, oko kukuthi, uvakalelo lokubona.
4. Ukuqonda okucacileyo kokuqonda yiparameter yempawu ebonisa iimpawu zendalo ze-photosensitive material of the detector. Imele esona siganeko sisezantsi soxinaniso lwefoton yangoku enokulinganiswa ngesixhobo sokubona uphawu. Ixabiso layo lingahluka ngokweemeko zokusebenza ze-detector ye-wavelength yesignali yokukhanya okulinganisiweyo (njengeqondo lokushisa eliphantsi, i-bias esetyenzisiweyo, njl.). I-bandwidth enkulu ye-detector, inkulu indawo ye-optical signal detector, encinci ye-NEP yengxolo elingana namandla, kunye nokuphezulu kokubona uvakalelo oluthile. Uvakalelo oluthe ngqo oluphezulu lokuchongwa kwe-detector ithetha ukuba ifanelekile ekubhaqweni kweempawu zamehlo ezibuthathaka kakhulu.
5. Ukusebenza kakuhle kwe-Quantum Q yenye iparamitha yophawu olubalulekileyo lwe-optical signal detector. Ichazwa njengomlinganiselo wenani le "impendulo" ezinokulinganiswa eziveliswe yifotomon kwi-detector kwinani leefotoni zesiganeko kumphezulu we-photosensitive material. Umzekelo, kwizichongi zemiqondiso yokukhanya ezisebenza ekukhutshweni kwefotoni, ukusebenza kakuhle kwequantum ngumlinganiselo wenani leefotoelectrons ezikhutshwa kumphezulu wezinto ezibonisa ukukhanya ukuya kwinani leefotoni zomqondiso olinganisiweyo oqikelelweyo phezu komhlaba. Kwisixhobo se-optical signal detector usebenzisa i-pn junction semiconductor material njengesixhobo se-photosensitive, ukusebenza kakuhle kwe-quantum ye-detector kubalwa ngokwahlula inani lezibini ze-electron hole eziveliswe ngumqondiso wokukhanya olinganisiweyo ngenani leefotoni zomqondiso wesiganeko. Olunye umboniso oqhelekileyo wobuchule bobungakanani besixhobo sokubona umqondiso kukusetyenziswa kwe-Rd yokuphendula komtshina.
6. Ixesha lokuphendula liyiparameter ebalulekileyo yokubonakalisa isantya sokuphendula se-optical signal detector kwi-intensitet change of the measurement light signal. Xa umqondiso wokukhanya olinganisiweyo ulungelelaniswa kwimo ye-pulse yokukhanya, ukuqina komqondiso we-pulse yombane owenziwe yisenzo sawo kwi-detector kufuneka "ukhuphuke" ukuya "kwincopho" ehambelanayo emva kwexesha elithile lokuphendula, kwaye ukusuka "kwincopho" kwaye emva koko ubuyele "kwixabiso le-zero" lokuqala elihambelana nesenzo se-pulse yokukhanya. Ukuze uchaze impendulo ye-detector ekutshintsheni ubungakanani bomqondiso wokukhanya okulinganisiweyo, ixesha apho ubukhulu bombane owenziwe sisiganeko sokukhanya kwe-pulse kuphakama ukusuka kwixabiso layo eliphezulu le-10% ukuya kwi-90% libizwa ngokuba "ixesha lokunyuka", kwaye ixesha apho uphawu lombane lwe-pulse waveform luwa ukusuka kwixabiso layo eliphezulu le-90% okanye "ixesha le-90%" libizwa ngokuba "ixesha le-10% ukuya kwi-90%.
7. Umgca wempendulo yenye iparameter yeempawu ezibalulekileyo ezibonisa ubudlelwane obusebenzayo phakathi kwempendulo ye-optical signal detector kunye nobukhulu besiganeko esilinganisa umqondiso wokukhanya. Ifuna imveliso yeisikhangeli somqondiso wokukhanyaukuba nolungelelwaniso phakathi koluhlu oluthile lokuqina komqondiso wokukhanya olinganisiweyo. Ngokuqhelekileyo kuchazwa ukuba ukuphambuka kwepesenti kwi-input-output linearity ngaphakathi koluhlu oluchaziweyo lwe-intensite ye-optical signal intensity yimpendulo yomgca wempendulo ye-optical signal detector.
Ixesha lokuposa: Aug-12-2024