Silicon Optical modulator ya FMCW

Silicon Optical modulatorza FMCW

Monga tonse tikudziwa, chimodzi mwazinthu zofunika kwambiri pamakina a Lidar a FMCW ndi makina apamwamba kwambiri. Mfundo yake yogwirira ntchito ikuwonetsedwa mu chithunzi chotsatira: Kugwiritsa ntchitoDP-IQ modulatorzochokerasingle sideband modulation (SSB), pamwamba ndi pansiMZMgwirani ntchito pamalo opanda pake, pamsewu ndi pansi pa gulu la mbali la wc + wm ndi WC-WM, wm ndi ma frequency osinthika, koma nthawi yomweyo njira yotsika imayambitsa kusiyana kwa magawo 90, ndipo pomaliza kuwala kwa WC-WM yathetsedwa, nthawi yosinthira pafupipafupi ya wc+wm. Pa chithunzi b, LR buluu ndi chizindikiro cha chirp cha FM, RX lalanje ndi chizindikiro chowonetsera, ndipo chifukwa cha zotsatira za Doppler, chizindikiro chomaliza chimatulutsa f1 ndi f2.

Mtunda ndi liwiro ndi:

Zotsatirazi ndi nkhani yofalitsidwa ndi Shanghai Jiaotong University mu 2021, zaSSBjenereta zomwe zimagwiritsa ntchito FMCW kutengerasilicon kuwala modulators.

Magwiridwe a MZM akuwonetsedwa motere: Kusiyana kwa magwiridwe antchito apamwamba ndi otsika mkono modulator ndi yayikulu. The chonyamulira sideband kukanidwa chiŵerengero ndi osiyana ndi pafupipafupi kusinthasintha kusinthasintha mlingo, ndipo zotsatira adzakhala woipa pamene pafupipafupi ukuwonjezeka.

M'chithunzi chotsatira, zotsatira zoyesa za dongosolo la Lidar zimasonyeza kuti a / b ndi chizindikiro cha kugunda pa liwiro lomwelo komanso pamtunda wosiyana, ndipo c / d ndi chizindikiro cha kugunda pamtunda womwewo komanso pa liwiro losiyana. Zotsatira za mayeso zidafika 15mm ndi 0.775m / s.

Apa, kugwiritsa ntchito silicon kokhaOptical modulekwa FMCW ikukambidwa. M'malo mwake, zotsatira za silicon optical modulator sizabwino ngati zaLiNO3 modulator, makamaka chifukwa mu silicon kuwala modulator, gawo kusintha/mayamwidwe coefficient/mphambano capacitance si mzere ndi kusintha voteji, monga momwe chithunzi pansipa:

Ndiko kuti,

Ubale wa mphamvu zotuluka wamodulatordongosolo ili motere
Zotsatira zake ndikusintha kwadongosolo kwambiri:

Izi zipangitsa kufutukuka kwa siginecha ya kugunda komanso kutsika kwa chiŵerengero cha siginecha ndi phokoso. Ndiye njira yosinthira mzere wa silicon light modulator ndi iti? Apa timangokambirana za mawonekedwe a chipangizocho, ndipo osakambirana za chiwongola dzanja pogwiritsa ntchito zida zina zothandizira.
Chimodzi mwa zifukwa zomwe si mzere wa kusinthasintha kwa gawo ndi voteji ndikuti malo ounikira mu waveguide ali m'magawo osiyanasiyana a magawo olemetsa komanso opepuka komanso kusintha kwa gawo kumasiyana ndi kusintha kwamagetsi. Monga momwe tawonetsera pa chithunzi chotsatirachi. Chigawo chochepa chokhala ndi kusokoneza kwakukulu chimasintha pang'ono kusiyana ndi kusokoneza kuwala.

Chithunzi chotsatirachi chikuwonetsa zokhotakhota zakusintha kwa njira yachitatu ya intermodulation kupotoza TID ndi yachiwiri kuti harmonic kupotoza SHD ndi ndende ya clutter, ndiko kuti, modulation pafupipafupi. Zitha kuwoneka kuti kuthekera kwa kupondereza kwa detuning kwa zolemetsa zolemetsa ndikwambiri kuposa kuchulukira kopepuka. Chifukwa chake, remix imathandizira kuwongolera mzere.

Zomwe zili pamwambazi ndizofanana ndi kuganizira C mu chitsanzo cha RC cha MZM, ndipo chikoka cha R chiyenera kuganiziridwanso. Zotsatirazi ndi kusintha kokhota kwa CDR3 ndi kukana kwa mndandanda. Zitha kuwoneka kuti kukana kocheperako, ndikokulirapo kwa CDR3.

Pomaliza, zotsatira za silicon modulator sizoyipa kwambiri kuposa za LiNbO3. Monga tawonetsera pachithunzichi, CDR3 yasilicon moduleadzakhala apamwamba kuposa a LiNbO3 pa nkhani ya kukondera kwathunthu kudzera mu kapangidwe koyenera kamangidwe ndi kutalika kwa modulator. Zoyeserera zimakhalabe zofananira.

Mwachidule, mapangidwe apangidwe a silicon light modulator akhoza kuchepetsedwa, osachiritsidwa, ndipo ngati angagwiritsidwe ntchito mumchitidwe wa FMCW amafunikira kutsimikiziridwa koyesera, ngati kungakhaledi, ndiye kuti akhoza kukwaniritsa mgwirizano wa transceiver, womwe uli ndi ubwino. pofuna kuchepetsa ndalama zambiri.