I-modulator ye-silicon optical ye-FMCW

I-modulator ye-silicon opticalye-FMCW

Njengoba sonke sazi, enye yezingxenye ezibaluleke kakhulu ezinhlelweni ze-Lidar ezisekelwe ku-FMCW yi-modulator ephezulu yomugqa. Isimiso sayo sokusebenza siboniswe esithombeni esilandelayo: UkusebenzisaI-modulator ye-DP-IQokusekelweukuguqulwa kwebhendi eseceleni eyodwa (SSB), phezulu naphansiI-MZMukusebenza endaweni engenalutho, emgwaqweni nangaphansi kwebhendi eseceleni ye-wc+wm kanye ne-WC-WM, i-wm iyimvamisa yokuguquguquka, kodwa ngesikhathi esifanayo isiteshi esingezansi sethula umehluko wesigaba sama-degrees angu-90, futhi ekugcineni ukukhanya kwe-WC-WM kuyakhanselwa, kuphela isikhathi sokushintsha kwemvamisa se-wc+wm. KuMfanekiso b, i-LR blue iyisignali yendawo ye-FM chirp, i-RX orange iyisignali eboniswayo, futhi ngenxa yomphumela we-Doppler, isignali yokugcina yokushaya ikhiqiza i-f1 kanye ne-f2.

Ibanga kanye nesivinini yilezi:

Okulandelayo yisihloko esanyatheliswa yiShanghai Jiaotong University ngo-2021, mayelanaI-SSBabakhiqizi abasebenzisa i-FMCW ngokusekelwe ku-ama-modulators okukhanya kwe-silicon.

Ukusebenza kwe-MZM kuboniswa kanje: Umehluko wokusebenza kwama-modulators engalo ephezulu nephansi mkhulu kakhulu. Isilinganiso sokwenqatshwa kwebhendi eseceleni yenkampani sihlukile ngesilinganiso sokuguqulwa kwemvamisa, futhi umphumela uzoba mubi njengoba imvamisa ikhula.

Esifanekisweni esilandelayo, imiphumela yokuhlolwa kohlelo lwe-Lidar ikhombisa ukuthi i-a/b iyisignali yokushaya ngesivinini esifanayo nangamabanga ahlukene, kanti i-c/d iyisignali yokushaya ngebanga elifanayo nangamazinga ahlukene. Imiphumela yokuhlolwa ifinyelele ku-15mm kanye no-0.775m /s.

Lapha, ukusetshenziswa kwe-silicon kuphelai-modulator yokukhanyakuxoxwa nge-FMCW. Eqinisweni, umphumela we-silicon optical modulator awumuhle njengowe-I-modulator ye-LiNO3, ikakhulukazi ngoba ku-silicon optical modulator, i-phase change/absorption coefficient/junction capacitance ayiqondile ngokushintsha kwe-voltage, njengoba kuboniswe esithombeni esingezansi:

Leyo,

Ubudlelwano bamandla okukhiphai-modulatoruhlelo lulandelayo
Umphumela uba ukwehla kwe-oda eliphezulu:

Lokhu kuzobangela ukwanda kwesignali yemvamisa yokushaya kanye nokwehla kwesilinganiso sesignali-kuya-kumsindo. Ngakho-ke iyiphi indlela yokuthuthukisa ukulingana kwe-modulator yokukhanya kwe-silicon? Lapha sixoxa kuphela ngezici zedivayisi ngokwayo, futhi asixoxi ngohlelo lokunciphisa sisebenzisa ezinye izakhiwo ezisizayo.
Esinye sezizathu zokungalungi kwesigaba sokuguquguquka nge-voltage ukuthi insimu yokukhanya ku-waveguide isekusatshalalisweni okuhlukile kwamapharamitha asindayo nakhanyayo futhi izinga lokushintsha kwesigaba lihlukile ngokushintsha kwe-voltage. Njengoba kuboniswe esithombeni esilandelayo. Isifunda sokuncipha esinokuphazamiseka okukhulu sishintsha kancane kunaleso sokuphazamiseka kokukhanya.

Isithombe esilandelayo sibonisa amajika okushintsha kwe-TID ye-intermodulation ye-third-order kanye ne-harmonic distortion ye-second-order SHD kanye nokuhlushwa kwe-clutter, okungukuthi, imvamisa yokuguquguquka. Kungabonakala ukuthi ikhono lokucindezela lokuhlukanisa i-clutter esindayo liphakeme kunele-clutter elula. Ngakho-ke, ukuxuba kabusha kusiza ukuthuthukisa ukulingana.

Lokhu okungenhla kufana nokucabanga ngo-C kumodeli ye-RC ye-MZM, futhi ithonya lika-R kufanele licatshangelwe. Okulandelayo yijika lokushintsha le-CDR3 ngokumelana kochungechunge. Kungabonakala ukuthi uma ukumelana kochungechunge kuncane, i-CDR3 inkulu.

Okokugcina kodwa okungabalulekile, umphumela we-silicon modulator awubi kakhulu kunowe-LiNbO3. Njengoba kuboniswe esithombeni esingezansi, i-CDR3 ye-i-modulator ye-siliconkuzoba phezulu kune-LiNbO3 uma kwenzeka ukubandlulula okugcwele ngokuklama okunengqondo kwesakhiwo nobude be-modulator. Izimo zokuhlola zihlala zihambisana.

Ngamafuphi, ukwakheka kwesakhiwo se-silicon light modulator kungancishiswa kuphela, hhayi ukwelashwa, futhi ukuthi ingasetshenziswa ngempela yini ohlelweni lwe-FMCW idinga ukuqinisekiswa kokuhlolwa, uma ingaba njalo ngempela, khona-ke ingafinyelela ukuhlanganiswa kwe-transceiver, okunezinzuzo zokunciphisa izindleko ezinkulu.