Silicon optique modulator ya FMCW

Moderi ya optiquekuri FMCW

Nkuko twese tubizi, kimwe mubice byingenzi muri sisitemu ya Lidar ya FMCW ni moderi yo hejuru. Ihame ryakazi ryayo ryerekanwa mumashusho akurikira: GukoreshaModeri ya DP-IQishingiyeGuhindura umurongo umwe (SSB), hejuru no hepfoMZMkora kuri null point, kumuhanda no kumurongo wuruhande rwa wc + wm na WC-WM, wm numuyoboro wa modulation, ariko mugihe kimwe, umuyoboro wo hasi uzana itandukaniro rya dogere 90, hanyuma urumuri rwa WC-WM irahagaritswe, gusa igihe cyo guhinduranya inshuro ya wc + wm. Mu gishushanyo b, LR ubururu nicyo kimenyetso cya FM cya chirp yaho, RX orange nicyo kimenyetso kigaragara, kandi kubera ingaruka ya Doppler, ikimenyetso cya nyuma cyo gukubita gitanga f1 na f2.

Intera n'umuvuduko ni:

Ibikurikira ni ingingo yasohowe na kaminuza ya Shanghai Jiaotong mu 2021, hafiSSBamashanyarazi ashyira mu bikorwa FMCW ashingiyesilicon yumucyo.

Imikorere ya MZM irerekanwa gutya: Itandukaniro ryimikorere ya modulator yo hejuru no hepfo ni nini cyane. Umubare wabatwara uruhande rwo kwangwa uratandukanye nigipimo cyo guhinduranya inshuro, kandi ingaruka zizagenda nabi uko inshuro ziyongera.

Mu gishushanyo gikurikira, ibisubizo by'ibizamini bya sisitemu ya Lidar byerekana ko a / b ari ikimenyetso cyo gukubita ku muvuduko umwe no ku ntera zitandukanye, kandi c / d ni ikimenyetso cyo gukubita intera imwe kandi ku muvuduko utandukanye. Ibisubizo by'ibizamini byageze kuri 15mm na 0.775m / s.

Hano, gusa ikoreshwa rya siliconmoderi nzizakuri FMCW iraganirwaho. Mubyukuri, ingaruka za moderi ya silicon optique ntabwo ari nziza nkiyiLiNO3 modulator, cyane cyane kubera ko muri moderi ya silicon optique, icyiciro cyo guhindura / kwinjiza coefficient / guhuza ubushobozi ntabwo ari umurongo hamwe nimpinduka za voltage, nkuko bigaragara mumashusho hepfo:

Ni ukuvuga,

Ibisohoka imbaraga zumubano wamodulatorSisitemu ni nkibi bikurikira
Igisubizo nicyiciro cyo hejuru gitandukanya:

Ibi bizatera kwaguka kwa signal yumurongo no kugabanuka kwikigereranyo-cy-urusaku. Nubuhe buryo bwo kunoza umurongo wa moderi ya silicon yumucyo? Hano turaganira gusa kubiranga igikoresho ubwacyo, kandi ntituganira kuri gahunda yindishyi dukoresheje izindi nzego zifasha.
Imwe mumpamvu zituma umurongo utari umurongo wa modulation icyiciro hamwe na voltage ni uko umurima wumucyo muri waveguide uri mukwirakwiza gutandukanye ibipimo biremereye kandi byoroheje kandi igipimo cyo guhindura icyiciro kiratandukanye no guhindura voltage. Nkuko bigaragara ku ishusho ikurikira. Agace ka depletion hamwe nimbogamizi ziremereye zirahinduka kurenza iyo hamwe no guhuza urumuri.

Igishushanyo gikurikira cyerekana impinduka zumurongo wa gatatu-gutondekanya intermodulation kugoreka TID hamwe na kabiri-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya-ya. Birashobora kugaragara ko ubushobozi bwo guhagarika disuning ya clutter iremereye irenze iyo kumurabyo. Kubwibyo, remixing ifasha kunoza umurongo.

Ibyavuzwe haruguru bihwanye no gusuzuma C muburyo bwa RC bwa MZM, kandi ingaruka za R nazo zigomba gutekerezwa. Ibikurikira nuguhindura umurongo wa CDR3 hamwe nurukurikirane rwo kurwanya. Birashobora kugaragara ko uko urukurikirane ruto rurwanya, CDR3 nini.

Icya nyuma ariko ntabwo ari gito, ingaruka za moderi ya silicon ntabwo byanze bikunze iruta iya LiNbO3. Nkuko bigaragara ku gishushanyo gikurikira, CDR3 yamoderi ya siliconbizaba hejuru kurenza ibya LiNbO3 mugihe habaye kubogama kwuzuye hifashishijwe igishushanyo mbonera cyimiterere n'uburebure bwa modulator. Ibizamini bisigaye bihoraho.

Muncamake, igishushanyo mbonera cya moderi ya silicon yumucyo irashobora kugabanywa gusa, ntigikizwe, kandi niba koko ishobora gukoreshwa muri sisitemu ya FMCW ikeneye igeragezwa ryikigereranyo, niba bishoboka rwose, noneho irashobora kugera kuri transceiver ihuza, ifite ibyiza yo kugabanya ibiciro binini.