Bandwidth ndi kuyankha kwa chowunikira zithunzi

Bandwidth ndi kuyankha kwachowunikira zithunzi
MukasankhaChowunikira zithunzi cha InGaAs, aliyense amafuna zinthu zomwezo: bandwidth yoposa 10 GHz ndi reactivity yoposa 0.9 A/W. Nditayang'ana buku la deta, ndinapeza kuti manambala awiriwa samawonekera pa chipangizo chimodzi. Kuyankha kwa bandwidth yoposa 0.5 A/W kapena kutsika, ndipo bandwidth yoposa reaction yoposa MHz mazana ochepa okha. Izi si vuto laukadaulo ndi wopanga - bandwidth ndi reaction zimatsutsana mwachibadwa mu fizikisi, ndipo simungathe kukhala nazo mbali zonse ziwiri.
Bandwidth ndi reaction ndi kutsutsana kwachilengedwe, komwe kumachokera mu critical parameter ya absorption layer maximum. Kuonjezera makulidwe a absorption layer kungathandize kukonza bwino kwa quantum (potero kumawonjezera reaction), koma kudzawonjezera nthawi yoyendera ya charger carriers (potero kuchepetsa bandwidth); Mosiyana ndi zimenezi, popanga PIN photodetector yokhazikika, ziwirizi sizingakwaniritsidwe nthawi imodzi ndipo mgwirizano uyenera kupangidwa.
Ndondomeko yotsogola yamakampani:
Nkhaniyi ikupereka njira zitatu zamakono zamakono zomwe cholinga chake ndi kuthetsa kutsutsana kumeneku:
Chowunikira mtundu wa Waveguide (WGPD): Chimachotsa njira yofalitsira kuwala kuchokera ku njira yolowera ya zonyamulira zamagetsi, ndipo chimatha kupeza bandwidth yayikulu (>40 GHz) komanso kuyankha kwakukulu (>0.9 A/W) nthawi imodzi, koma njirayi ndi yovuta ndipo mtengo wake ndi wokwera.
Chowunikira Chonyamulira Chonyamula Zinthu Zofanana (UTC-PD): Pogwiritsa ntchito ma elekitironi othamanga kwambiri okha kuti azitha kuyenda, kuchotsa nthawi yocheperako yoyendera mabowo othamanga kwambiri, imatha kufika pa bandwidth yayikulu kwambiri (>100 GHz) ndipo imagwiritsidwa ntchito kwambiri m'magawo olumikizirana othamanga kwambiri komanso a terahertz.
Chowunikira kuwala kwa Resonant cavity enhanced photodetector (RCE): Pogwiritsa ntchito chowunikira kuwala kuti chiwonjezere kuyamwa kwa kuwala mkati mwa gawo lochepa la kuyamwa, chingathandize kukonza bwino kwa quantum pamene chikusunga bandwidth yayikulu, koma bandwidth yogwirira ntchito (spectral range) ndi yopapatiza kwambiri.
Malangizo posankha polojekiti:
Fotokozani kufunika kwa zofunikira: Choyamba, dziwani kuchuluka kwa bandwidth komwe kumafunika pa chowunikira zithunzi kutengera kuchuluka kwa bandwidth ya chizindikiro cha dongosolo (ndi malire a nthawi zitatu), kenako sankhani chitsanzo chomwe chili ndi kuyankha kwakukulu pansi pa vutoli.
Samalani zizindikiro za mulingo wa dongosolo: Poyesa chowunikira zithunzi, samalani mphamvu yofanana ndi phokoso (NEP) ndi kukhudzidwa kwa dongosolo, osati kungoyankha kokha, chifukwa kuyankha kwakukulu kumatha kutsagana ndi phokoso lalikulu.
TaganiziraniChowunikira zithunzi cha APDMuzochitika za mphamvu zochepa: Pamene mphamvu ya kuwala kwa ngozi ili yochepa kwambiri (monga <-30 dBm), kuchuluka kwa kuwala kwa avalanche photodiode (APD photodetector) kungagwiritsidwe ntchito kubwezera kusowa kwa mphamvu yoyankhira, koma chisamaliro chiyenera kuperekedwa ku phokoso lake lochulukirapo.
Kusankha WGPD yokhala ndi zofunikira zambiri komanso bajeti yayikulu: Pamene dongosololi likufuna bandwidth yayikulu (>20 GHz) komanso kuyankha kwakukulu (>0.8 A/W), zowunikira za PIN zokhazikika sizingakwaniritse zofunikira, ndipo zowunikira zamtundu wa waveguide (WGPD) ziyenera kuganiziridwa mwachindunji.
Mapeto:
Kusinthana kwa bandwidth response-off kwa muyezoChowunikira chithunzi cha PINndi choletsa chenicheni chakuthupi. Kuti tidutse bwino, pakufunika luso lamakono mu kapangidwe ka chipangizo kuti tichotse njira yoyatsira kuwala kuchokera ku njira yonyamulira. Mayankho apamwamba ali ndi magwiridwe antchito abwino koma amawononga ndalama zambiri, kotero muzochita zaukadaulo, ndikofunikirabe kupanga mgwirizano pakati pa zochitika zinazake zogwiritsira ntchito, zofunikira pakugwira ntchito, ndi bajeti.