Silicon optical modulator rau FMCW

Silicon optical modulatorrau FMCW

Raws li peb txhua tus paub, ib qho tseem ceeb tshaj plaws nyob rau hauv FMCW-raws li Lidar systems yog lub siab linearity modulator. Nws txoj hauv kev ua haujlwm tau qhia hauv daim duab hauv qab no: SivDP-IQ modulatorrawsIb leeg sideband modulation (SSB), sab sauv thiab qisMZMua hauj lwm ntawm null point, ntawm txoj kev thiab nqes ntawm sab band ntawm wc + wm thiab WC-WM, wm yog modulation zaus, tab sis tib lub sij hawm lub qis channel qhia 90 degrees theem sib txawv, thiab thaum kawg lub teeb ntawm WC-WM raug tshem tawm, tsuas yog lub sijhawm hloov pauv zaus ntawm wc + wm. Nyob rau hauv daim duab b, LR xiav yog lub zos FM chirp teeb liab, RX txiv kab ntxwv yog lub teeb liab tshwm sim, thiab vim Doppler nyhuv, qhov kawg ntaus teeb liab tsim f1 thiab f2.

Qhov deb thiab ceev yog:

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

Qhov kev ua tau zoo ntawm MZM yog qhia raws li hauv qab no: Qhov kev ua tau zoo sib txawv ntawm sab caj npab thiab sab caj npab modulators yog qhov loj. Tus neeg nqa khoom sab nraud tsis lees paub qhov sib txawv nrog qhov hloov pauv zaus, thiab cov txiaj ntsig yuav ua phem dua li qhov zaus nce.

Hauv daim duab hauv qab no, cov txiaj ntsig ntawm Lidar system qhia tau hais tias a / b yog lub teeb liab sib tw ntawm tib qhov ceev thiab nyob ntawm qhov sib txawv, thiab c / d yog lub teeb liab sib tw ntawm tib qhov deb thiab ntawm qhov sib txawv. Cov txiaj ntsig ntsuas tau mus txog 15mm thiab 0.775m / s.

Ntawm no, tsuas yog daim ntawv thov ntawm siliconoptical modulatorrau FMCW tau tham txog. Hauv kev muaj tiag, cov nyhuv ntawm silicon optical modulator tsis zoo li ntawmLiNO3 modulator, feem ntau vim hais tias nyob rau hauv silicon optical modulator, lub theem hloov / nqus coefficient / hlws ris capacitance yog non-linear nrog lub voltage hloov, raws li qhia nyob rau hauv daim duab hauv qab no:

Ntawd yog,

Kev sib raug zoo ntawm cov zis hluav taws xobmodulatorsystem yog raws li nram no
Qhov tshwm sim yog kev txiav txim siab detuning:

Cov no yuav ua rau kev nthuav dav ntawm lub suab nrov zaus thiab qhov txo qis ntawm cov teeb liab-rau-suab nrov piv. Yog li dab tsi yog txoj hauv kev los txhim kho cov linearity ntawm silicon teeb modulator? Ntawm no peb tsuas yog tham txog cov yam ntxwv ntawm lub cuab yeej nws tus kheej, thiab tsis txhob tham txog cov nyiaj them poob haujlwm uas siv lwm cov kev pabcuam pabcuam.
Ib qho ntawm cov laj thawj rau qhov tsis yog-linearity ntawm kev hloov pauv theem nrog qhov hluav taws xob yog tias lub teeb pom kev hauv lub waveguide yog nyob rau hauv qhov sib txawv ntawm qhov sib txawv ntawm qhov hnyav thiab lub teeb tsis zoo thiab cov theem hloov pauv txawv nrog qhov hloov ntawm qhov voltage. Raws li pom hauv daim duab hauv qab no. Lub cheeb tsam depletion nrog hnyav cuam tshuam hloov tsawg dua li nrog lub teeb cuam tshuam.

Cov duab hauv qab no qhia tau hais tias qhov kev hloov pauv ntawm qhov kev txiav txim thib peb intermodulation distortion TID thiab qhov thib ob-order harmonic distortion SHD nrog rau qhov concentration ntawm cov clutter, uas yog, qhov hloov zaus zaus. Nws tuaj yeem pom tias qhov muaj peev xwm tiv thaiv ntawm qhov detuning rau hnyav clutter yog siab dua li rau lub teeb clutter. Yog li ntawd, remixing pab txhim kho linearity.

Cov saum toj no yog sib npaug rau kev txiav txim siab C hauv RC qauv ntawm MZM, thiab kev cuam tshuam ntawm R yuav tsum tau txiav txim siab. Cov hauv qab no yog qhov hloov pauv ntawm CDR3 nrog cov kev ua haujlwm tsis zoo. Nws tuaj yeem pom tias qhov me me ntawm cov kev tiv thaiv, qhov loj dua CDR3.

Qhov kawg tab sis tsis kawg, cov nyhuv ntawm silicon modulator tsis tas yuav phem dua li ntawm LiNbO3. Raws li pom hauv daim duab hauv qab no, CDR3 ntawm lubsilicon modulatoryuav siab dua li ntawm LiNbO3 nyob rau hauv cov ntaub ntawv ntawm tag nrho kev tsis ncaj ncees los ntawm tsim nyog tsim ntawm tus qauv thiab ntev ntawm lub modulator. Cov xwm txheej xeem nyob ib puag ncig.

Hauv cov ntsiab lus, cov qauv tsim ntawm silicon lub teeb modulator tsuas tuaj yeem txo qis, tsis kho, thiab seb nws puas tuaj yeem siv tiag tiag hauv FMCW system xav tau kev sim tshuaj xyuas, 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.