Yazisa i-bandwidth kunye nexesha lokunyuka kwe-photodetector

Yazisa i-bandwidth kunye nexesha lokunyuka kwe-photodetector

I-bandwidth kunye nexesha lokunyuka (ekwabizwa ngokuba lixesha lokuphendula) le-photodetector zizinto eziphambili ekuvavanyeni umtshina we-optical detector. Abantu abaninzi abanalo nofifi malunga nezi parameters zimbini. Eli nqaku liza kwazisa ngokuthe ngqo i-bandwidth kunye nexesha lokunyuka kwe-photodetector.

Ixesha lokunyuka (τr) kunye nexesha lokuwa (tf) zombini zizalathisi eziphambili zokulinganisa isantya sokuphendula se-photodetectors. I-3dB bandwidth, njengesalathisi kwi-domain frequency, ihambelana ngokusondeleyo nexesha lokunyuka ngokwesantya sokuphendula. Ubudlelwane phakathi kwe-bandwidth ye-BW ye-photodetector kunye nexesha layo lokuphendula i-Tr inokuguqulwa ngokukhawuleza ngolu hlobo lulandelayo: Tr = 0.35 / BW.

Ixesha lokunyuka ligama kwi-teknoloji ye-pulse, ichaza kunye nentsingiselo yokuba isignali iphakama ukusuka kwelinye iphuzu (ngokuqhelekileyo: I-Vout * 10%) ukuya kwelinye iphuzu (ngokuqhelekileyo: Vout * 90%). I-amplitude yecala elikhulayo le-Rise Time signal ibhekisela ngokubanzi kwixesha elithathiweyo ukunyuka ukusuka kwi-10% ukuya kwi-90%. Umgaqo wovavanyo: Isiginali ihanjiswa ecaleni kwendlela ethile, kwaye enye intloko yesampulu isetyenziselwa ukufumana nokulinganisa ixabiso le-voltage pulse ekupheleni okude.

Ixesha lokunyuka komqondiso libalulekile ekuqondeni imiba yemfezeko yomqondiso. Uninzi lweengxaki ezinxulumene nokusebenza kwesicelo semveliso kuyilo lwe-high-speed bandwidth photodetectors zidibene nayo. Xa ukhetha i-photodetector, kufuneka inikwe ingqwalasela eyaneleyo. Ixesha lokunyuka linempembelelo enkulu ekusebenzeni kwesiphaluka. Logama nje ikuluhlu oluthile, kufuneka ithathelwe ingqalelo, nokuba luhlobo olungacacanga kakhulu.

Njengoko ixesha lokunyuka komqondiso lincipha, iingxaki ezinje nge-reflection, crosstalk, ukuwohloka kwe-orbit, imitha ye-electromagnetic, kunye ne-bounce yomhlaba ebangelwa ngumqondiso wangaphakathi okanye isignali yemveliso ye-photodetector ibe nzima ngakumbi, kwaye ingxaki yengxolo iba nzima ukuyicombulula. Ukususela kumbono wokuhlalutya kwe-spectral, ukunciphisa ixesha lokunyuka kwesignali lilingana nokunyuka kwe-bandwidth yesignali, oko kukuthi, kukho amacandelo aphezulu aphezulu kwi-signal. Yiyo kanye la macandelo aphezulu-frequency eyenza uyilo lube nzima. Iintambo zoqhagamshelo kufuneka zithathwe njengeentambo zothumelo, nto leyo ekhokelele kwiingxaki ezininzi ebezingekho ngaphambili.

Ngoko ke, kwinkqubo yesicelo se-photodetectors, kufuneka ube nombono onjalo: xa isignali yesiphumo se-photodetector inomda onyukayo okanye i-overshoot enzima kakhulu, kwaye isibonakaliso asizinzile, kunokwenzeka ukuba i-photodetector oyithengileyo ayihlangabezani neemfuno zoyilo olufanelekileyo lwengqibelelo yomqondiso kwaye ayikwazi ukuhlangabezana neemfuno zakho zesicelo ngokwemiqathango ye-bandwidth kunye nokunyuka kwexesha. Iimveliso ze-photoelectric detector ye-JIMU Guangyan zonke iisampulu zeetshiphusi zombane zamva nje, iitshiphusi zeamplifier ezisebenza ngesantya esiphezulu, kunye neesekethe ezichanekileyo zokucoca. Ngokweempawu zeempawu zesicelo zabathengi, zihambelana ne-bandwidth kunye nexesha lokunyuka. Inyathelo ngalinye lithathela ingqalelo ukuthembeka komqondiso. Gwema iingxaki eziqhelekileyo ezifana nengxolo ephezulu yesignali kunye nokuzinza okungahambi kakuhle okubangelwa ukungalingani phakathi kwe-bandwidth kunye nexesha lokunyuka kwisicelo se-photodetectors kubasebenzisi.