Ububanzi bomkhawulo kanye nokuphendula kwe-umshini wokuthola izithombe
Uma ukhethaIsitholi sezithombe se-InGaAs, wonke umuntu ufuna imininingwane efanayo: i-bandwidth engaphezu kwe-10 GHz kanye nokusabela okungaphezu kwe-0.9 A/W. Ngemva kokufunda incwadi yemiyalelo yedatha, ngithole ukuthi lezi zinombolo ezimbili aziveli kudivayisi efanayo. Ukusabela okuphezulu kwe-bandwidth kungu-0.5 A/W noma ngaphansi, kanti i-bandwidth ephezulu yokuphendula ingamakhulu ambalwa e-MHz. Lokhu akuyona inkinga yobuchwepheshe ngomkhiqizi - i-bandwidth kanye nokusabela kuyaphikisana ngokwemvelo ku-physics, futhi awukwazi ukuba nakho kokubili.
I-bandwidth kanye nokusabela kuyimpikiswano engokomzimba engokwemvelo, egxile kupharamitha ebalulekile yobukhulu besendlalelo sokumunca. Ukwandisa ubukhulu besendlalelo sokumunca kungathuthukisa ukusebenza kahle kwe-quantum (ngaleyo ndlela kuthuthukisa ukuphendula), kodwa kuzokwandisa isikhathi sokuhamba kwabathwali beshaja (ngaleyo ndlela kunciphisa i-bandwidth); Ngokuphambene nalokho. Ngakho-ke, ekwakhiweni kwe-PIN photodetector ejwayelekile, lokhu kokubili akukwazi ukufezwa ngesikhathi esisodwa futhi kufanele kwenziwe isivumelwano.
Uhlelo lokuthuthuka kwemboni:
Lesi sihloko sethula izixazululo ezintathu zobuchwepheshe ezisezingeni eliphezulu ezihlose ukugqashula kulokhu kungqubuzana:
I-Waveguide type detector (WGPD): Ihlukanisa indlela yokusabalalisa ukukhanya kusuka ohlangothini lokukhukhuleka kwabathwali beshaja, futhi ingafinyelela i-bandwidth ephezulu (>40 GHz) kanye nokusabela okuphezulu (>0.9 A/W) ngasikhathi sinye, kodwa inqubo iyinkimbinkimbi futhi izindleko ziphezulu.
I-Unidirectional Carrier Transport photodetector (UTC-PD): Isebenzisa ama-electron asheshayo kuphela ukuze ishukume, isuse isikhathi sokuhamba semigodi esivinini esiphansi, ingafinyelela i-bandwidth ephezulu kakhulu (>100 GHz) futhi ivame ukusetshenziswa emikhakheni yokuxhumana esheshayo kanye ne-terahertz.
I-Resonant cavity enhanced photodetector (RCE): Ukusebenzisa i-optical resonant cavity ukuthuthukisa ukumuncwa kokukhanya ngaphakathi kwesendlalelo esincane sokumuncwa, kungathuthukisa ukusebenza kahle kwe-quantum ngenkathi kugcinwa i-bandwidth ephezulu, kodwa i-operating bandwidth (ububanzi be-spectral) incane kakhulu.
Iziphakamiso zokukhetha iphrojekthi:
Cacisa ukubaluleka kwezidingo: Okokuqala, nquma isidingo se-bandwidth esincane se-photodetector ngokusekelwe ku-bandwidth yesignali yesistimu (ene-margin yezikhathi ezi-3), bese ukhetha imodeli ephendula kakhulu ngaphansi kwalesi simo.
Naka izinkomba zezinga lesistimu: Lapho uhlola i-photodetector, kufanele unake amandla alingana nomsindo (i-NEP) kanye nokuzwela kwesistimu, hhayi nje ukuphendula, njengoba ukuphendula okuphezulu kungahambisana nomsindo ophezulu.
CabangaIsitholi sezithombe se-APDezimweni zamandla aphansi: Uma amandla okukhanya kwesigameko ephansi kakhulu (njenge-<-30 dBm), inzuzo yangaphakathi ye-avalanche photodiode (i-APD photodetector) ingasetshenziswa ukukhokhela ukuntuleka kokuphendula, kodwa kufanele kuqashelwe umsindo wayo oweqile.
Ukukhetha i-WGPD enezidingo eziphezulu kanye nesabelomali esiphezulu: Uma uhlelo ludinga kokubili i-bandwidth ephezulu (>20 GHz) kanye nokusabela okuphezulu (>0.8 A/W), ama-PIN detector ajwayelekile awakwazi ukuhlangabezana nezidingo, futhi ama-waveguide type detectors (WGPD) kufanele acatshangelwe ngqo.
Isiphetho:
Ukushintshaniswa kokuphendula kwe-bandwidth kwesilinganisoIsitholi sesithombe se-PINkuyimingcele engokomzimba engokwemvelo. Ukuze kudlule ngempela kukho, kudingeka ukusungula izinto ezintsha ekwakhiweni kwedivayisi ukuze kuhlukaniswe ngokomzimba indlela yokumunca ukukhanya endleleni yokuhamba kwenkampani. Izixazululo eziphezulu zisebenza kahle kakhulu kodwa zibiza kakhulu, ngakho-ke ekusebenzeni kobunjiniyela, kusadingeka ukwenza isivumelwano phakathi kwezimo ezithile zohlelo lokusebenza, izidingo zokusebenza, kanye nesabelomali.
Isikhathi sokuthunyelwe: Ephreli-13-2026