DziwitsaniChowunikira zithunzi cha InGaAs
InGaAs ndi imodzi mwa zipangizo zabwino kwambiri zopezera mayankho apamwamba komansochowunikira zithunzi cha liwiro lalikuluChoyamba, InGaAs ndi chipangizo cha bandgap cholunjika, ndipo m'lifupi mwake mutha kulamulidwa ndi chiŵerengero pakati pa In ndi Ga, zomwe zimathandiza kuzindikira zizindikiro za kuwala za mafunde osiyanasiyana. Pakati pawo, In0.53Ga0.47As imagwirizana bwino ndi lattice ya InP substrate ndipo ili ndi mphamvu yoyamwa kuwala kwambiri mu band yolumikizirana ya kuwala. Ndi yomwe imagwiritsidwa ntchito kwambiri pokonzekerachowunikira zithunzindipo ilinso ndi mphamvu yakuda komanso kuyankha bwino kwambiri. Kachiwiri, zipangizo zonse za InGaAs ndi InP zili ndi liwiro lalikulu la ma electron drift, ndipo liwiro lawo la saturated electron drift lili pafupifupi 1 × 107cm/s. Pakadali pano, pansi pa magetsi enaake, zipangizo za InGaAs ndi InP zimawonetsa zotsatira za electron velocity overshoot, ndipo liwiro lawo la overshoot limafika 4 × 107cm/s ndi 6 × 107cm/s motsatana. Ndikothandiza kuti pakhale bandwidth yodutsa kwambiri. Pakadali pano, InGaAs photodetectors ndiye chowunikira kwambiri cha zithunzi pakulankhulana kwa kuwala. Msika, njira yolumikizira pamwamba ndi zochitika ndiyo yodziwika kwambiri. Zinthu zowunikira pamwamba ndi zochitika zomwe zili ndi 25 Gaud/s ndi 56 Gaud/s zitha kupangidwa kale mochuluka. Zowunikira zazing'ono, zam'mbuyo, komanso zapamwamba kwambiri zapangidwanso, makamaka pa ntchito monga liwiro lalikulu komanso kuchuluka kwakukulu. Komabe, chifukwa cha zofooka za njira zawo zolumikizirana, zozindikira za ngozi ya pamwamba zimakhala zovuta kuzigwirizanitsa ndi zida zina za optoelectronic. Chifukwa chake, chifukwa cha kufunikira kwakukulu kwa kuphatikiza kwa optoelectronic, zozindikira za InGaAs zolumikizidwa ndi ma waveguide zomwe zimagwira ntchito bwino kwambiri komanso zoyenera kuphatikizidwa pang'onopang'ono zakhala cholinga chachikulu cha kafukufuku. Pakati pawo, ma module a InGaAs amalonda a 70GHz ndi 110GHz pafupifupi onse amagwiritsa ntchito kapangidwe ka ma waveguide coupling. Malinga ndi kusiyana kwa zinthu za substrate, zozindikira za InGaAs zolumikizidwa ndi ma waveguide zimatha kugawidwa m'magulu awiri: zochokera ku INP ndi zochokera ku Si. Epitaxial yazinthu zomwe zili pa substrate za InP ili ndi khalidwe lapamwamba ndipo ndiyoyenera kwambiri kupanga zida zapamwamba. Komabe, pazinthu za gulu la III-V zomwe zimakula kapena kulumikizidwa pa substrate za Si, chifukwa cha kusiyana kosiyanasiyana pakati pa zinthu za InGaAs ndi substrate za Si, mtundu wazinthu kapena mawonekedwe ake ndi wochepa, ndipo pakadalibe malo okwanira oti zipangizozi zigwire ntchito bwino.
Kukhazikika kwa chowunikira zithunzi m'malo osiyanasiyana ogwiritsira ntchito, makamaka m'mikhalidwe yovuta kwambiri, ndi chimodzi mwazinthu zofunika kwambiri pakugwiritsa ntchito. M'zaka zaposachedwa, mitundu yatsopano ya zowunikira monga perovskite, zinthu zachilengedwe ndi ziwiri, zomwe zakopa chidwi cha anthu ambiri, zikukumanabe ndi mavuto ambiri pankhani ya kukhazikika kwa nthawi yayitali chifukwa chakuti zinthuzo zimakhudzidwa mosavuta ndi zinthu zachilengedwe. Pakadali pano, njira yolumikizira zinthu zatsopano sinakule, ndipo kufufuza kwina kukufunikabe kuti pakhale kupanga kwakukulu komanso magwiridwe antchito.
Ngakhale kuti kuyambitsa ma inductors kungawonjezere bwino kuchuluka kwa bandwidth ya zida pakadali pano, sikudziwika bwino m'makina olumikizirana a digito. Chifukwa chake, momwe mungapewere zotsatira zoyipa kuti muchepetse kwambiri magawo a RC a parasitic a chipangizocho ndi njira imodzi yofufuzira ya high-speed photodetector. Kachiwiri, pamene bandwidth ya ma waveguide olumikizidwa ndi ma photodetector ikupitirira kukula, choletsa pakati pa bandwidth ndi reaction chimayamba kuonekeranso. Ngakhale ma Ge/Si photodetectors ndi InGaAs photodetector okhala ndi bandwidth ya 3dB yopitilira 200GHz anenedwa, reactions awo si okhutiritsa. Momwe mungakulitsire bandwidth pamene mukusunga reaction yabwino ndi nkhani yofunika kwambiri yofufuza, yomwe ingafunike kuyambitsa zipangizo zatsopano zogwirizana ndi njira (kusuntha kwakukulu ndi coefficient yayikulu yoyamwa) kapena kapangidwe katsopano ka chipangizo chothamanga kwambiri kuti muthetse. Kuphatikiza apo, pamene bandwidth ya chipangizocho ikuwonjezeka, zochitika zogwiritsira ntchito ma detectors mu ma microwave photonic links zidzawonjezeka pang'onopang'ono. Mosiyana ndi kuchuluka kwa mphamvu ya kuwala kochepa komanso kuzindikira kwamphamvu kwambiri mu kulumikizana kwa kuwala, vutoli, potengera bandwidth yayikulu, lili ndi kufunikira kwakukulu kwa mphamvu ya saturation ya kuchuluka kwa mphamvu yamagetsi. Komabe, zipangizo zamagetsi zamagetsi nthawi zambiri zimagwiritsa ntchito kapangidwe kakang'ono, kotero sikophweka kupanga zida zowunikira zamagetsi zamagetsi zamagetsi komanso zamagetsi zamagetsi, ndipo zinthu zina zatsopano zingafunike pochotsa ndi kufalitsa kutentha kwa zidazo. Pomaliza, kuchepetsa mphamvu yakuda ya zida zowunikira zamagetsi zamagetsi zamagetsi zamagetsi zamagetsi kumakhalabe vuto lomwe zida zowunikira zamagetsi zamagetsi zomwe zili ndi vuto la lattice ziyenera kuthetsa. Mphamvu yamdima imagwirizana kwambiri ndi khalidwe la kristalo ndi momwe zinthu zilili pamwamba. Chifukwa chake, njira zazikulu monga heteroepitaxy yapamwamba kapena kugwirizana pansi pa njira zosagwirizana ndi lattice zimafuna kafukufuku wambiri ndi ndalama.
Nthawi yotumizira: Ogasiti-20-2025