Silicon optical modulator rau FMCW

Silicon optical modulatorrau FMCW

Raws li peb txhua tus paub, ib qho ntawm cov khoom tseem ceeb tshaj plaws hauv FMCW-based Lidar systems yog lub high linearity modulator. Nws txoj cai ua haujlwm tau qhia hauv daim duab hauv qab no: SivDP-IQ modulatorraws likev hloov kho ib sab (SSB), sab saud thiab sab hauv qabMZMua haujlwm ntawm qhov chaw tsis muaj zog, ntawm txoj kev thiab nqis rau sab ntawm wc + wm thiab WC-WM, wm yog qhov zaus hloov kho, tab sis tib lub sijhawm cov channel qis dua qhia txog qhov sib txawv ntawm theem 90 degrees, thiab thaum kawg lub teeb ntawm WC-WM raug tshem tawm, tsuas yog lub sijhawm hloov pauv zaus ntawm wc + wm. Hauv Daim Duab b, LR xiav yog lub teeb liab FM hauv zos, RX txiv kab ntxwv yog lub teeb liab cuam tshuam, thiab vim yog Doppler effect, lub teeb liab kawg tsim f1 thiab f2.

Qhov deb thiab qhov ceev yog:

Cov hauv qab no yog tsab xov xwm luam tawm los ntawm Shanghai Jiaotong University xyoo 2021, hais txogSSBcov generators uas siv FMCW raws lisilicon lub teeb modulators.

Kev ua tau zoo ntawm MZM tau qhia raws li nram no: Qhov sib txawv ntawm kev ua tau zoo ntawm cov modulators sab saud thiab sab qis yog qhov loj heev. Qhov piv txwv tsis lees txais ntawm cov neeg nqa khoom sab nraud yog txawv nrog rau qhov zaus hloov kho zaus, thiab qhov cuam tshuam yuav zuj zus tuaj thaum qhov zaus nce ntxiv.

Hauv daim duab hauv qab no, cov txiaj ntsig ntawm kev sim ntawm Lidar system qhia tias a/b yog lub teeb liab ntaus ntawm tib qhov ceev thiab ntawm qhov deb sib txawv, thiab c/d yog lub teeb liab ntaus ntawm tib qhov deb thiab ntawm qhov ceev sib txawv. Cov txiaj ntsig ntawm kev sim tau txog 15 hli thiab 0.775m / s.

Hauv qhov no, tsuas yog siv silicon xwbcov khoom siv kho qhov muagrau FMCW tau tham txog. Qhov tseeb, qhov cuam tshuam ntawm silicon optical modulator tsis zoo li ntawmLiNO3 modulator, feem ntau vim tias nyob rau hauv silicon optical modulator, qhov hloov pauv theem / kev nqus coefficient / junction capacitance yog non-linear nrog qhov hloov pauv voltage, raws li qhia hauv daim duab hauv qab no:

Yog li ntawd,

Kev sib raug zoo ntawm lub zog tso zis ntawmtus neeg hloov kholub kaw lus yog raws li nram no
Qhov tshwm sim yog qhov kev txiav txim siab siab:

Cov no yuav ua rau lub teeb liab zaus dav dua thiab txo qhov sib piv ntawm lub teeb liab thiab lub suab nrov. Yog li ntawd, yuav ua li cas thiaj txhim kho tau qhov linearity ntawm lub teeb silicon modulator? Ntawm no peb tsuas yog tham txog cov yam ntxwv ntawm lub cuab yeej nws tus kheej, thiab tsis tham txog cov txheej txheem them nyiaj siv lwm cov qauv pabcuam.
Ib qho ntawm cov laj thawj rau qhov tsis yog linearity ntawm modulation theem nrog voltage yog tias lub teeb teb hauv waveguide yog nyob rau hauv kev faib tawm sib txawv ntawm cov khoom hnyav thiab lub teeb thiab qhov hloov pauv theem yog txawv nrog qhov hloov pauv ntawm voltage. Raws li pom hauv daim duab hauv qab no. Thaj chaw depletion nrog kev cuam tshuam hnyav hloov pauv tsawg dua li qhov nrog kev cuam tshuam lub teeb.

Daim duab hauv qab no qhia txog cov kab hloov pauv ntawm qhov kev sib txuas lus thib peb TID thiab qhov kev sib txuas lus thib ob SHD nrog rau qhov kev sib txuas lus, uas yog, qhov zaus hloov kho. Nws tuaj yeem pom tias lub peev xwm tshem tawm ntawm kev tshem tawm rau cov kev sib txuas lus hnyav yog siab dua li rau cov kev sib txuas lus sib zog. Yog li ntawd, remixing pab txhim kho linearity.

Qhov saum toj no yog sib npaug rau kev xav txog C hauv RC qauv ntawm MZM, thiab qhov cuam tshuam ntawm R kuj yuav tsum tau xav txog. Cov hauv qab no yog qhov hloov pauv ntawm CDR3 nrog rau qhov tsis kam ntawm series. Nws tuaj yeem pom tias qhov me dua qhov tsis kam ntawm series, qhov loj dua CDR3.

Qhov kawg tab sis tsis tsawg tshaj plaws, qhov cuam tshuam ntawm silicon modulator tsis tas yuav phem dua li ntawm LiNbO3. Raws li pom hauv daim duab hauv qab no, CDR3 ntawmsilicon modulatoryuav siab dua li ntawm LiNbO3 nyob rau hauv cov ntaub ntawv ntawm kev ntxub ntxaug tag nrho los ntawm kev tsim qauv tsim nyog ntawm cov qauv thiab ntev ntawm lub modulator. Cov xwm txheej xeem tseem nyob ruaj khov.

Hauv kev xaus lus, qhov kev tsim qauv ntawm lub teeb silicon modulator tsuas yog tuaj yeem txo qis, tsis kho, thiab seb nws puas tuaj yeem siv tau hauv FMCW system xav tau kev txheeb xyuas kev sim, yog tias nws tuaj yeem ua tau tiag tiag, ces nws tuaj yeem ua tiav kev sib koom ua ke transceiver, uas muaj qhov zoo rau kev txo nqi loj.