I-Silicon optical module ye-FMCW

I-silicon optical modulatorkwe-FMCW

Njengoba sonke sazi, enye yezingxenye ezibaluleke kakhulu ezinhlelweni ze-Lidar ezisekelwe ku-FMCW imoduli yomugqa ophezulu. Umgomo wayo wokusebenza uboniswa esithombeni esilandelayo: UkusebenzisaI-DP-IQ moduleokusekelwei-single sideband modulation (SSB), phezulu nangaphansiMZMsebenza endaweni eyi-null, emgwaqeni naphansi kwebhendi eseceleni ye-wc+wm ne-WC-WM, i-wm imvamisa yokushintshashintsha, kodwa ngesikhathi esifanayo isiteshi esiphansi sethula umehluko wesigaba sama-degree angama-90, futhi ekugcineni ukukhanya kwe-WC-WM ikhanseliwe, kuphela isikhathi sokushintsha imvamisa ye-wc+wm. Emfanekisweni b, i-LR eluhlaza okwesibhakabhaka isignali ye-chirp ye-FM yendawo, i-RX orange iyisiginali ebonisiwe, futhi ngenxa yomphumela we-Doppler, isignali yokushaya kokugcina ikhiqiza i-f1 ne-f2.

Ibanga nesivinini yilezi:

Okulandelayo yindatshana eshicilelwe yi-Shanghai Jiaotong University ngo-2021, mayelanaI-SSBamajeneretha asebenzisa i-FMCW ngokusekelwei-silicon modulators ukukhanya.

Ukusebenza kwe-MZM kukhonjiswe ngale ndlela elandelayo: Umehluko wokusebenza wamamodulators angalo aphezulu naphansi mkhulu uma kuqhathaniswa. Isilinganiso sokunqatshwa kwe-sideband yenkampani yenethiwekhi sihlukile ngesilinganiso sokushintshwa kwemvamisa, futhi umphumela uzoba mubi kakhulu njengoba imvamisa inyuka.

Emfanekisweni olandelayo, imiphumela yokuhlolwa yesistimu ye-Lidar ibonisa ukuthi i-a/b iyisiginali yokushaya ngesivinini esifanayo namabanga ahlukene, futhi i-c/d iyisiginali yokushaya ebangeni elifanayo nangesivinini esihlukile. Imiphumela yokuhlolwa ifinyelele ku-15mm no-0.775m/s.

Lapha, ukusetshenziswa kwe-silicon kuphelaoptical moduleye-FMCW kuxoxwa ngayo. Eqinisweni, umphumela we-silicon optical modulator awumuhle njengalowo weI-LiNO3 module, ikakhulukazi ngenxa yokuthi kumoduli ye-silicon optical, ukuguqulwa kwesigaba/ukumuncwa kwe-coefficient/junction capacitance ayinalayini nokushintsha kwamandla kagesi, njengoba kuboniswe esithombeni esingezansi:

Leyo,

Ubudlelwano bamandla okukhiphayo weimoduliuhlelo kanje
Umphumela uwukuhoxiswa kwe-oda eliphezulu:

Lokhu kuzodala ukunwetshwa kwesignali yefrikhwensi yebhithi kanye nokuncipha kwesilinganiso sesignali-kuya-nomsindo. Ngakho-ke iyiphi indlela yokuthuthukisa ukuhambisana kwe-silicon modulator yokukhanya? Lapha sixoxa kuphela ngezici zedivayisi ngokwayo, futhi ungaxoxi ngohlelo lwesinxephezelo usebenzisa ezinye izakhiwo ezisizayo.
Esinye sezizathu zokungahambelani kwesigaba sokushintshanisa nge-voltage ukuthi inkambu yokukhanya ku-waveguide isekusakazweni okuhlukile kwamapharamitha asindayo futhi alula futhi izinga lokushintsha kwesigaba lihlukile ngokushintsha kwamandla kagesi. Njengoba kukhonjisiwe esithombeni esilandelayo. Isifunda sokuncipha esinokuphazamiseka okukhulu sishintsha ngaphansi kwalapho ngokuphazamiseka kokukhanya.

Isibalo esilandelayo sibonisa amajika oshintsho lwe-TID ye-oda lesithathu lokuhlanekezela kanye ne-harmonic yohlelo lwesibili lokuhlanekezela i-SHD nokugxiliswa kwe-clutter, okungukuthi, imvamisa yokushintshashintsha. Kungabonakala ukuthi ikhono lokucindezela le-detuning ye-clutter esindayo liphakeme kunalelo le-clutter elula. Ngakho-ke, ukuxuba kabusha kusiza ukuthuthukisa umugqa.

Okungenhla kulingana nokucabangela u-C kumodeli ye-RC ye-MZM, futhi ithonya lika-R kufanele licatshangelwe. Okulandelayo ijika lokushintsha le-CDR3 ngokumelana nochungechunge. Kuyabonakala ukuthi okuncane kokumelana nochungechunge, kukhulu i-CDR3.

Okokugcina, umphumela we-silicon modulator awumbi kangako kune-LiNbO3. Njengoba kukhonjisiwe esithombeni esingezansi, i-CDR3 ye-i-silicon moduleizoba phezulu kunaleyo ye-LiNbO3 esimweni sokuchema okuphelele ngokuklama okunengqondo kwesakhiwo nobude bemoduli. Izimo zokuhlola zihlala zingashintshile.

Kafushane, ukwakheka kwesakhiwo se-silicon modulator yokukhanya kungancishiswa kuphela, kungelapheki, nokuthi ukuthi ingasetshenziswa ngempela ohlelweni lwe-FMCW idinga ukuqinisekiswa kokuhlolwa, uma kungaba yiqiniso, ingafinyelela ukuhlanganiswa kwe-transceiver, enezinzuzo. ukuze kuncishiswe izindleko ezinkulu.