I-modulator ye-silicon optical ye-FMCW

Imodyuli ye-silicon opticalye-FMCW

Njengoko sonke sisazi, enye yezona zinto zibalulekileyo kwiinkqubo zeLidar ezisekwe kwi-FMCW yi-high linearity modulator. Umgaqo wayo wokusebenza uboniswe kumfanekiso olandelayo: UkusebenzisaImodulator ye-DP-IQisekelweukuguquguquka kwebhendi esecaleni enye (SSB), phezulu nasezantsiI-MZMukusebenza kwindawo engenanto, endleleni nasezantsi kwicala le-wc+wm kunye ne-WC-WM, i-wm yi-modulation frequency, kodwa kwangaxeshanye itshaneli esezantsi ingenisa umahluko wesigaba sama-90 degrees, kwaye ekugqibeleni ukukhanya kwe-WC-WM kuyacinywa, kuphela ixesha lokutshintsha kwe-frequency le-wc+wm. KuMfanekiso b, i-LR blue sisignali ye-FM chirp yendawo, i-RX orange sisignali ebonakalisiweyo, kwaye ngenxa yesiphumo seDoppler, isignali yokugqibela ye-beat ivelisa i-f1 kunye ne-f2.

Umgama kunye nesantya zezi:

Eli linqaku elilandelayo elipapashwe yiYunivesithi yaseShanghai Jiaotong ngo-2021, malungaI-SSBiijenereyitha ezisebenzisa i-FMCW ngokusekelwe kwiiimodulators zokukhanya kwesilicon.

Ukusebenza kwe-MZM kuboniswa ngolu hlobo lulandelayo: Umahluko ekusebenzeni kwee-modulators zengalo ephezulu nesezantsi mkhulu kakhulu. Umlinganiselo wokwaliwa kwebhendi esecaleni yenkampani wahlukile ngokwezinga lokuguquguquka kwemvamisa, kwaye isiphumo siya kuba sibi njengoko imvamisa isanda.

Kulo mfanekiso ulandelayo, iziphumo zovavanyo lwenkqubo yeLidar zibonisa ukuba i-a/b sisignali yokubetha ngesantya esifanayo nakwimigama eyahlukeneyo, kwaye i-c/d sisignali yokubetha kumgama ofanayo nakwizantya ezahlukeneyo. Iziphumo zovavanyo zifikelele kwi-15mm kunye ne-0.775m /s.

Apha, kuphela ukusetyenziswa kwe-siliconi-modulator yokukhanyakwi-FMCW kuyaxoxwa ngayo. Enyanisweni, isiphumo se-silicon optical modulator asilunganga njengese-Imodulator yeLiNO3, kuba ikakhulu kwi-silicon optical modulator, i-phase change/absorption coefficient/junction capacitance ayihambelani notshintsho lwe-voltage, njengoko kubonisiwe kumfanekiso ongezantsi:

Yiyo i,

Ubudlelwane bamandla emvelisoi-modulatorinkqubo imi ngolu hlobo lulandelayo
Isiphumo kukunciphisa umgangatho ophezulu:

Oku kuya kubangela ukwanda kwesignali yesandisi-sandi kunye nokwehla komlinganiselo wesignali-kwingxolo. Ngoko ke yeyiphi indlela yokuphucula ulungelelwaniso lwe-silicon light modulator? Apha sixoxa kuphela ngeempawu zesixhobo ngokwaso, kwaye asixoxi ngesicwangciso sokuhlawula sisebenzisa ezinye izakhiwo ezincedisayo.
Esinye sezizathu zokungahambelani kwesigaba sokuguquguquka nge-voltage kukuba intsimi yokukhanya kwi-waveguide isasazwa ngeendlela ezahlukeneyo zeeparameter ezinzima nezikhanyayo kwaye izinga lokutshintsha kwesigaba lahlukile ngotshintsho lwe-voltage. Njengoko kubonisiwe kumfanekiso olandelayo. Ummandla wokuphelelwa ngamandla ophazamiseko olukhulu utshintsha kancinci kunalowo wokuphazamiseka kokukhanya.

Lo mfanekiso ulandelayo ubonisa ii-change curves ze-third-order intermodulation distortion TID kunye ne-second-order harmonic distortion SHD kunye noxinzelelo lwe-clutter, oko kukuthi, i-modulation frequency. Kuyabonakala ukuba amandla okunciphisa i-detuning kwi-clutter enzima aphezulu kunaleyo ye-clutter ekhanyayo. Ke ngoko, ukuxuba kwakhona kunceda ukuphucula ulungelelwaniso.

Oku kungasentla kufana nokuqwalasela u-C kwimodeli ye-RC ye-MZM, kwaye impembelelo ka-R nayo kufuneka iqwalaselwe. Oku kulandelayo yijika lotshintsho lwe-CDR3 kunye nokumelana kochungechunge. Kuyabonakala ukuba okukhona ukuxhathisa kochungechunge kuncinci, kokukhona i-CDR3 inkulu.

Okokugqibela kodwa okungabalulekanga kangako, isiphumo se-silicon modulator asibi kakhulu kunese-LiNbO3. Njengoko kubonisiwe kumfanekiso ongezantsi, i-CDR3 ye-i-modulator ye-siliconiya kuba phezulu kuneyeLiNbO3 kwimeko yokukhetha ngokupheleleyo ngoyilo olufanelekileyo lwesakhiwo kunye nobude bemodulator. Iimeko zovavanyo zihlala zihambelana.

Ngamafutshane, uyilo lwesakhiwo se-silicon light modulator lunokunciphisa kuphela, lunganyangeki, kwaye nokuba lungasetyenziswa ngokwenene kwinkqubo ye-FMCW lufuna ukuqinisekiswa kovavanyo, ukuba lungasetyenziswa ngokwenene, ngoko lunokufezekisa ukuhlanganiswa kwe-transceiver, okunezibonelelo zokunciphisa iindleko ezinkulu.