Yazisa i-bandwidth kunye nexesha lokunyuka kwe-photodetector
I-bandwidth kunye nexesha lokunyuka (ekwaziwa njengexesha lokuphendula) le-photodetector zizinto ezibalulekileyo ekuvavanyeni i-optical detector. Abantu abaninzi abanalo ulwazi ngezi parameter zimbini. Eli nqaku liza kwazisa ngokukodwa i-bandwidth kunye nexesha lokunyuka kwe-photodetector.
Ixesha lokunyuka (τr) kunye nexesha lokuwa (τf) zombini ziimpawu ezibalulekileyo zokulinganisa isantya sempendulo yee-photodetectors. I-bandwidth ye-3dB, njengesalathisi kwi-frequency domain, inxulumene kakhulu nexesha lokunyuka ngokwesantya sempendulo. Ubudlelwane phakathi kwe-bandwidth BW ye-photodetector kunye nexesha layo lokuphendula i-Tr bunokuguqulwa ngokubanzi ngale fomyula ilandelayo: Tr=0.35/BW.
Ixesha lokunyuka ligama kwitekhnoloji ye-pulse, elichaza kwaye lithetha ukuba isignali inyuka ukusuka kwindawo enye (ngesiqhelo: Vout*10%) ukuya kwenye indawo (ngesiqhelo: Vout*90%). Ubukhulu bomda onyukayo wesignali yeRise Time bubhekisa kwixesha elithatyathwe ukunyuka ukusuka kwi-10% ukuya kwi-90%. Umgaqo wovavanyo: Isignali idluliselwa kwindlela ethile, kwaye enye intloko yesampulu isetyenziselwa ukufumana nokulinganisa ixabiso le-voltage pulse kwisiphelo esikude.
Ixesha lokunyuka kwesignali libalulekile ekuqondeni imiba yokuthembeka kwesignali. Uninzi lweengxaki ezinxulumene nokusebenza kwesicelo semveliso kuyilo lwee-photodetectors ze-bandwidth ezikhawulezayo zidibene nayo. Xa ukhetha i-photodetector, kufuneka inikwe ingqalelo eyaneleyo. Ixesha lokunyuka linempembelelo enkulu ekusebenzeni kwesekethe. Logama nje ingaphakathi koluhlu oluthile, kufuneka ithathwe nzulu, nokuba luluhlu olungacacanga kakhulu.
Njengoko ixesha lokunyuka kwesignali lincipha, iingxaki ezinje ngokubonakalisa, ukuthetha nge-crosstalk, ukuwa kwe-orbit, i-electromagnetic radiation, kunye nokugquma komhlaba okubangelwa yisignali yangaphakathi okanye isignali yokuphuma kwe-photodetector ziba nzima ngakumbi, kwaye ingxaki yengxolo iba nzima ukuyisombulula. Ngokwembono yohlalutyo lwe-spectral, ukunciphisa ixesha lokunyuka kwesignali kufana nokwanda kwe-bandwidth yesignali, oko kukuthi, kukho izinto ezininzi eziphindaphindayo kwisignali. Zizo kanye ezi zinto ziphindaphindayo ezenza uyilo lube nzima. Imigca yokunxibelelana kufuneka iphathwe njengemigca yokudlulisela, nto leyo ekhokelele kwiingxaki ezininzi ezazingekho ngaphambili.
Ke ngoko, kwinkqubo yokufaka izicelo zeefotodetectors, kufuneka ube nombono onjalo: xa isignali yokukhupha yefotodetector inomphetho onyukayo okanye i-overshoot enzima, kwaye isignali ingazinzanga, kunokwenzeka ukuba ifotodetector oyithengileyo ayihlangabezani neemfuno zoyilo ezifanelekileyo zokuthembeka kwesignali kwaye ayinakuhlangabezana neemfuno zakho zokwenyani zesicelo ngokweeparameter ze-bandwidth kunye nexesha lokunyuka. Iimveliso ze-photoelectric detector ze-JIMU Guangyan zonke zenza iisampulu zee-photoelectric chips zamva nje eziphambili, ii-high-speed operating amplifier chips, kunye nee-filter circuits ezichanekileyo. Ngokweempawu zokwenyani zesignali yesicelo sabathengi, zihambelana ne-bandwidth kunye nexesha lokunyuka. Inyathelo ngalinye lithatha ingqalelo ukuthembeka kwesignali. Ziphephe iingxaki eziqhelekileyo ezifana nengxolo ephezulu yesignali kunye nokuzinza okubi okubangelwa kukungalingani phakathi kwe-bandwidth kunye nexesha lokunyuka ekusebenziseni ii-photodetectors kubasebenzisi.
Ixesha leposi: Septemba-29-2025