Tsitsani InGaAs photodetector

yambitsaniInGaAs Photodetector

InGaAs ndi imodzi mwazinthu zabwino zopezera mayankho apamwamba komansohigh-liwiro photodetector. Choyamba, InGaAs ndi chinthu cholunjika cha bandgap semiconductor, ndipo kutalika kwake kwa bandgap kumatha kuyendetsedwa ndi chiŵerengero chapakati pa In ndi Ga, zomwe zimathandiza kuzindikira zizindikiro za kuwala kwa mafunde osiyanasiyana. Pakati pawo, In0.53Ga0.47As imagwirizana bwino ndi lattice ya InP substrate ndipo ili ndi mphamvu yoyamwitsa kwambiri yowunikira mu gulu la optical communication. Ndilo amagwiritsidwa ntchito kwambiri pokonzekeraPhotodetectorndipo ilinso ndi magwiridwe antchito apamwamba kwambiri akuda komanso omvera. Kachiwiri, zida zonse za InGaAs ndi InP zimakhala ndi ma electron drift velocities, ndi ma electron drift velocities odzaza ndi 1 × 107cm/s. Pakalipano, pansi pa magetsi enieni, InGaAs ndi InP zipangizo zimasonyeza zotsatira za electron velocity overshoot, ndi maulendo awo opitirira 4 × 107cm / s ndi 6 × 107cm / s motsatira. Ndikoyenera kukwaniritsa bandwidth yowoloka kwambiri. Pakalipano, InGaAs photodetectors ndi photodetector yodziwika bwino kwambiri yolumikizirana ndi kuwala. Pamsika, njira yolumikizirana pamtunda ndiyofala kwambiri. Zida zowunikira zochitika zapamtunda zokhala ndi 25 Gaud/s ndi 56 Gaud/s zitha kupangidwa kale kwambiri. Zowunikira zazing'onoting'ono, zam'mbuyo, komanso zowunikira zapamwamba za bandwidth zapangidwanso, makamaka pazogwiritsa ntchito monga kuthamanga kwambiri komanso kuchuluka kwambiri. Komabe, chifukwa cha kuchepa kwa njira zawo zolumikizirana, zowunikira zomwe zimachitika pamtunda zimakhala zovuta kuziphatikiza ndi zida zina za optoelectronic. Chifukwa chake, pakuwonjezeka kwa kufunikira kwa kuphatikiza kwa optoelectronic, ma waveguide ophatikiza ma InGaAs ma photodetectors omwe amagwira ntchito bwino kwambiri komanso oyenera kuphatikiza pang'onopang'ono akhala gawo lofufuza. Pakati pawo, malonda a InGaAs photodetector modules a 70GHz ndi 110GHz pafupifupi onse amatengera ma waveguide coupling. Malinga ndi kusiyana kwa zida zapansi panthaka, ma waveguide ophatikizidwa ndi InGaAs photodetectors amatha kugawidwa m'mitundu iwiri: INP-based and Si-based. Epitaxial zakuthupi pa InP substrates zili ndi khalidwe lapamwamba ndipo ndizoyenera kupanga zipangizo zamakono. Komabe, kwa zida za gulu la III-V zomwe zidakula kapena zomangika pazigawo za Si, chifukwa cha kusagwirizana kosiyanasiyana pakati pa zida za InGaAs ndi magawo a Si, mawonekedwe ake kapena mawonekedwe ake ndi osauka, ndipo pakadalipo mwayi woti ziwongolere magwiridwe antchito a zida.

Kukhazikika kwa photodetector m'malo osiyanasiyana ogwiritsira ntchito, makamaka pansi pazovuta kwambiri, ndi chimodzi mwazinthu zofunika kwambiri pakugwiritsa ntchito. M'zaka zaposachedwapa, mitundu yatsopano ya zowunikira monga perovskite, organic and two-dimensional materials, zomwe zakopa chidwi kwambiri, zimakumanabe ndi zovuta zambiri zokhudzana ndi kukhazikika kwa nthawi yaitali chifukwa chakuti zipangizozo zimakhudzidwa mosavuta ndi zinthu zachilengedwe. Pakadali pano, kuphatikizika kwa zida zatsopano sikunakhwime, ndipo kufufuza kwina kumafunikabe kuti pakhale kupanga kwakukulu komanso kusasinthika kwa magwiridwe antchito.

Ngakhale kuyambitsidwa kwa ma inductors kumatha kukulitsa bandwidth yazida pakali pano, sikudziwika mumayendedwe a digito optical communication. Choncho, momwe mungapewere zotsatira zoipa kuti mupitirize kuchepetsa ma parasitic RC magawo a chipangizo ndi imodzi mwa njira zofufuzira za photodetector yothamanga kwambiri. Kachiwiri, pamene bandwidth ya ma waveguide ophatikizidwira ma photodetectors akuchulukirachulukira, zopinga pakati pa bandwidth ndi kuyankha zimayamba kuwonekeranso. Ngakhale ma photodetector a Ge/Si ndi InGaAs photodetector okhala ndi 3dB bandwidth yoposa 200GHz zanenedwa, maudindo awo sali okhutiritsa. Momwe mungakulitsire bandwidth ndikusunga kuyankha kwabwino ndi mutu wofunikira wofufuza, womwe ungafunike kukhazikitsidwa kwa zida zatsopano zogwirizana ndi njira (kuyenda kwapamwamba komanso kokwanira kwa mayamwidwe apamwamba) kapena zida zatsopano zamakina othamanga kwambiri kuti athetse. Kuonjezera apo, pamene bandwidth ya chipangizo ikuwonjezeka, zochitika zogwiritsira ntchito zowunikira mu microwave photonic links zidzawonjezeka pang'onopang'ono. Mosiyana ndi mawonekedwe ang'onoang'ono a mphamvu ya kuwala ndi kuzindikira kwakukulu mukulankhulana kwa kuwala, zochitika izi, pamaziko a bandwidth apamwamba, zimakhala ndi mphamvu zowonjezera mphamvu zowonjezera mphamvu zowonjezera mphamvu. Komabe, zipangizo zamakono zamakono nthawi zambiri zimagwiritsa ntchito mapangidwe ang'onoang'ono, choncho sikophweka kupanga zithunzithunzi zothamanga kwambiri komanso zowonjezereka, ndipo zowonjezera zowonjezera zingafunike pakuchotsa chonyamulira ndi kutaya kutentha kwa zipangizo. Pomaliza, kuchepetsa mdima wamagetsi ojambulira kuthamanga kwambiri kumakhalabe vuto lomwe ma photodetectors okhala ndi lattice mismatch ayenera kuthetsa. Mdima wakuda umagwirizana makamaka ndi mtundu wa kristalo ndi mawonekedwe apamwamba a zinthu. Choncho, njira zazikulu monga heteroepitaxy yapamwamba kwambiri kapena kugwirizanitsa pansi pa machitidwe osagwirizana ndi lattice amafuna kufufuza ndi ndalama zambiri.