Ib txoj kev npaj ntawm kev kho qhov muag zaus thinning raws liMZM modulator
Qhov kev faib tawm zaus optical tuaj yeem siv tau ua liDARlub teeb cikom tib lub sijhawm tso tawm thiab luam theej duab hauv ntau qhov kev taw qhia, thiab nws kuj tseem siv tau ua lub teeb ci ntau lub wavelength ntawm 800G FR4, tshem tawm cov qauv MUX. Feem ntau, lub teeb ci ntau lub wavelength yog lub zog qis lossis tsis tau ntim zoo, thiab muaj ntau yam teeb meem. Cov phiaj xwm qhia hnub no muaj ntau qhov zoo thiab tuaj yeem xa mus rau kev siv. Nws daim duab qauv yog qhia raws li hauv qab no: Lub zog siabDFB laserLub teeb ci yog CW lub teeb nyob rau hauv lub sijhawm sau thiab ib qho wavelength hauv zaus. Tom qab dhau los ntawm ib qhotus neeg hloov khonrog rau qee qhov zaus hloov kho fRF, sideband yuav tsim tawm, thiab qhov sib nrug ntawm sideband yog qhov zaus hloov kho fRF. Lub modulator siv lub LNOI modulator nrog qhov ntev ntawm 8.2 hli, raws li pom hauv Daim Duab b. Tom qab ib ntu ntev ntawm lub zog siabtheem modulator, qhov zaus hloov kho kuj yog fRF, thiab nws theem yuav tsum ua kom lub crest lossis trough ntawm lub teeb liab RF thiab lub teeb pulse sib piv rau ib leeg, ua rau muaj lub suab chirp loj, ua rau muaj ntau cov hniav optical. DC bias thiab qhov tob ntawm modulation ntawm lub modulator tuaj yeem cuam tshuam rau qhov tiaj tus ntawm qhov zaus optical dispersion.
Mathematically, lub teeb liab tom qab lub teeb teb raug modulated los ntawm modulator yog:
Nws tuaj yeem pom tias qhov tso zis tawm ntawm lub teeb pom kev zoo yog qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv nrog lub sijhawm sib txawv ntawm wrf, thiab qhov muaj zog ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv muaj feem cuam tshuam nrog lub zog ntawm DFB optical. Los ntawm kev sim ua kom lub teeb ci dhau los ntawm MZM modulator thiabPM theem modulator, thiab tom qab ntawd FFT, qhov optical frequency dispersion spectrum tau txais. Daim duab hauv qab no qhia txog kev sib raug zoo ncaj qha ntawm optical frequency flatness thiab modulator DC bias thiab modulation depth raws li qhov kev simulation no.
Daim duab hauv qab no qhia txog daim duab simulated spectral nrog MZM bias DC ntawm 0.6π thiab modulation tob ntawm 0.4π, uas qhia tau tias nws qhov tiaj tus yog <5dB.
Cov hauv qab no yog daim duab qhia txog pob khoom ntawm MZM modulator, LN yog 500nm tuab, qhov tob ntawm etching yog 260nm, thiab qhov dav ntawm waveguide yog 1.5um. Lub thickness ntawm lub electrode kub yog 1.2um. Lub thickness ntawm lub cladding sab saud SIO2 yog 2um.
Cov hauv qab no yog cov spectrum ntawm OFC uas tau sim, nrog 13 cov hniav optically sparse thiab flatness <2.4dB. Lub zaus modulation yog 5GHz, thiab lub zog RF loading hauv MZM thiab PM yog 11.24 dBm thiab 24.96dBm feem. Tus naj npawb ntawm cov hniav ntawm optical frequency dispersion excitation tuaj yeem nce ntxiv los ntawm kev nce ntxiv ntawm PM-RF lub zog, thiab lub sijhawm optical frequency dispersion tuaj yeem nce ntxiv los ntawm kev nce ntawm modulation frequency. daim duab
Qhov saum toj no yog raws li LNOI txoj kev npaj, thiab cov hauv qab no yog raws li IIIV txoj kev npaj. Daim duab qauv yog raws li nram no: Lub chip sib xyaw ua ke DBR laser, MZM modulator, PM theem modulator, SOA thiab SSC. Ib lub chip tuaj yeem ua tiav qhov kev ua tau zoo ntawm qhov muag zaus thinning.
Lub SMSR ntawm DBR laser yog 35dB, qhov dav ntawm kab yog 38MHz, thiab qhov ntau ntawm kev kho yog 9nm.
Lub MZM modulator siv los tsim cov sideband nrog qhov ntev ntawm 1 hli thiab bandwidth ntawm tsuas yog 7GHz @ 3dB. Feem ntau txwv los ntawm impedance mismatch, optical poob txog li 20dB @ -8B bias.
Qhov ntev ntawm SOA yog 500µm, uas yog siv los them rau qhov poob ntawm qhov sib txawv ntawm qhov muag pom, thiab qhov bandwidth ntawm spectral yog 62nm@3dB@90mA. Lub SSC sib xyaw ua ke ntawm cov zis ua rau kev sib txuas ntawm cov nti zoo dua (kev sib txuas ua ke yog 5dB). Lub zog tso zis kawg yog li −7dBm.
Yuav kom tsim tau qhov kev faib tawm zaus optical, qhov zaus RF modulation siv yog 2.6GHz, lub zog yog 24.7dBm, thiab Vpi ntawm lub modulator theem yog 5V. Daim duab hauv qab no yog qhov tshwm sim photophobic spectrum nrog 17 cov hniav photophobic @10dB thiab SNSR siab dua 30dB.
Cov txheej txheem no yog rau 5G microwave kis, thiab daim duab hauv qab no yog cov khoom spectrum uas lub teeb ntes tau, uas tuaj yeem tsim 26G cov teeb liab los ntawm 10 npaug ntawm qhov zaus. Nws tsis tau hais ntawm no.
Hauv kev xaus, qhov zaus kho qhov muag uas tsim los ntawm txoj kev no muaj qhov sib txawv ntawm zaus ruaj khov, suab nrov theem qis, lub zog siab thiab kev sib koom ua ke yooj yim, tab sis kuj muaj ntau yam teeb meem. Lub teeb liab RF thauj khoom ntawm PM xav tau lub zog loj, kev siv hluav taws xob loj, thiab qhov sib txawv ntawm zaus raug txwv los ntawm qhov nrawm hloov kho, txog li 50GHz, uas xav tau qhov sib txawv ntawm qhov ntev (feem ntau> 10nm) hauv FR8 system. Kev siv tsawg, lub zog tiaj tus tseem tsis txaus.
Lub sijhawm tshaj tawm: Lub Peb Hlis-19-2024