Hlahisa bandwidth le nako ea ho phahama ea photodetector
Nako ea bandwidth le nako ea ho phahama (e tsejoang hape e le nako ea ho arabela) ea photodetector ke lintho tsa bohlokoa tekong ea mochine oa mahlo. Batho ba bangata ha ba tsebe ka liparamente tsena tse peli. Sengoliloeng sena se tla hlahisa ka ho khetheha nako ea bandwidth le ho phahama ha photodetector.
Nako ea ho phahama (τr) le nako ea hoetla (τf) ka bobeli ke matšoao a bohlokoa a ho lekanya lebelo la karabo ea li-photodetectors. Bophahamo ba 3dB, joalo ka sesupo sebakeng sa maqhubu, bo amana haufi-ufi le nako ea ho phahama ho latela lebelo la karabo. Kamano pakeng tsa bandwidth BW ea photodetector le nako ea eona ea karabo Tr e ka fetoha ka mokhoa o batlang o fetoha ka mokhoa o latelang: Tr=0.35/BW.
Nako ea ho phahama ke lentsoe la theknoloji ea pulse, e hlalosang le ho bolela hore pontšo e phahama ho tloha sebakeng se le seng (hangata: Vout * 10%) ho ea sebakeng se seng (hangata: Vout * 90%). Bophahamo ba moeli o ntseng o phahama oa lets'oao la Rise Time hangata le bolela nako e nkuoeng ho nyoloha ho tloha ho 10% ho isa ho 90%. Molao-motheo oa teko: Letšoao le fetisoa ka tsela e itseng, 'me hlooho e 'ngoe ea sampole e sebelisetsoa ho fumana le ho lekanya boleng ba voltage pulse pheletsong e hole.
Nako ea ho phahama ha lets'oao ke ea bohlokoa bakeng sa ho utloisisa litaba tsa botšepehi ba matšoao. Boholo ba mathata a amanang le ts'ebetso ea ts'ebeliso ea sehlahisoa moralong oa li-photodetectors tsa bandwidth tse phahameng haholo li amahanngoa le eona. Ha u khetha photodetector, e tlameha ho fuoa tlhokomelo e lekaneng. Nako ea ho phahama e na le tšusumetso e kholo mosebetsing oa potoloho. Hafeela e le ka har'a moeli o itseng, e tlameha ho nkoa ka botebo, esita le haeba e le letoto le sa hlakang haholo.
Ha nako ea ho phahama ha lets'oao e ntse e fokotseha, mathata a kang ho bonahatsa, crosstalk, orbit collapse, radiation ea electromagnetic, le ho putlama ha fatše ho bakoang ke lets'oao le ka hare kapa lets'oao la sets'oants'o sa foto a ba matla le ho feta, mme bothata ba lerata bo ba thata ho rarolla. Ho latela pono ea tlhahlobo ea spectral, ho fokotseha ha nako ea ho phahama ha pontšo ho lekana le ho eketseha ha li-bandwidth tsa matšoao, ke hore, ho na le likarolo tse ling tse phahameng tsa maqhubu a pontšo. Hantle-ntle ke likarolo tsena tse phahameng-frequency tse etsang hore moralo o be thata. Lithapo tse hokelang li tlameha ho nkuoa e le likhoele tsa phetiso, e leng se bakileng mathata a mangata a neng a le sieo pele.
Ka hona, ts'ebetsong ea ts'ebetso ea li-photodetectors, u tlameha ho ba le mohopolo o joalo: ha lets'oao la sephetho sa photodetector le na le moepa o nyolohang kapa esita le ho fetella ho matla, mme lets'oao le sa tsitsa, ho ka etsahala hore photodetector eo u e rekileng ha e fihlelle litlhoko tse nepahetseng tsa moralo bakeng sa botšepehi ba matšoao 'me ha e khone ho fihlela litlhoko tsa hau tsa kopo ho latela li-bandwidth le nako ea ho phahama. Lihlahisoa tsa JIMU Guangyan tsa JIMU Guangyan kaofela li etsa mohlala oa lichifi tsa morao-rao tse tsoetseng pele tsa motlakase, li-chips tsa amplifier tse sebetsang ka lebelo le holimo le li-circuits tse nepahetseng. Ho ea ka litšobotsi tsa sebele tsa pontšo ea kopo ea bareki, li lumellana le bandwidth le nako ea ho phahama. Mohato o mong le o mong o nahanela botšepehi ba pontšo. Qoba mathata a tloaelehileng joalo ka lerata le phahameng la mats'oao le botsitso bo fokolang bo bakoang ke ho se lumellane lipakeng tsa bandwidth le nako ea ho phahama ts'ebelisong ea li-photodetectors bakeng sa basebelisi.
Nako ea poso: Sep-29-2025