Qhia cov silicon photonic Mach-Zende modulatorMZM modulator
CovModulato kev ua sir yog qhov tseem ceeb tshaj plaws nyob rau hauv lub transmitter kawg hauv 400G / 800G silicon photonic modules. Tam sim no, muaj ob hom modulators ntawm lub transmitter kawg ntawm cov khoom tsim tawm silicon photonic modules: Ib hom yog PAM4 modulator raws li ib leeg-channel 100Gbps ua haujlwm hom, uas ua tiav 800Gbps cov ntaub ntawv xa mus los ntawm 4-channel / 8-channel parallel mus kom ze thiab tsuas yog siv hauv cov chaw zov me nyuam thiab Gpus. Tau kawg, ib leeg-channel 200Gbps silicon photonics Mach-Zeonde modulator uas yuav sib tw nrog EML tom qab ntau lawm ntawm 100Gbps yuav tsum tsis txhob nyob deb. Qhov thib ob yog homIQ modulatorsiv nyob rau hauv kev sib txuas lus ntev-ntev coherent kho qhov muag. Lub coherent sinking hais nyob rau theem tam sim no yog hais txog kev sib kis ntawm cov khoom siv kho qhov muag xws li ntau txhiab mais hauv lub nroog qaum qaum teb mus rau ZR optical modules xws li 80 txog 120 mais, thiab txawm tias LR optical modules xws li 10 kilometers yav tom ntej.
Lub hauv paus ntsiab lus ntawm kev kub ceevsilicon modulatorstuaj yeem muab faib ua ob ntu: optics thiab hluav taws xob.
Optical feem: Lub hauv paus ntsiab lus yog Mach-zeund interferometer. Ib lub teeb ntawm lub teeb hla dhau ntawm 50-50 beam splitter thiab dhau los ua ob kab teeb ntawm lub teeb nrog lub zog sib npaug, uas txuas ntxiv mus rau hauv ob txhais tes ntawm lub modulator. Los ntawm theem tswj ntawm ib qho ntawm caj npab (uas yog, qhov ntsuas qhov ntsuas ntawm silicon hloov pauv los ntawm lub tshuab rhaub kom hloov qhov kev nthuav tawm ceev ntawm ib sab caj npab), qhov kawg beam ua ke yog nqa tawm ntawm kev tawm ntawm ob sab caj npab. Kev cuam tshuam theem ntev (qhov twg lub ncov ntawm ob txhais caj npab mus txog ib txhij) thiab cuam tshuam kev tshem tawm (qhov twg theem sib txawv yog 90 ° thiab lub ncov yog qhov sib txawv ntawm cov troughs) tuaj yeem ua tiav los ntawm kev cuam tshuam, yog li hloov lub teeb siv (uas tuaj yeem nkag siab li 1 thiab 0 hauv cov cim digital). Qhov no yog ib qho kev nkag siab yooj yim thiab kuj yog ib txoj hauv kev tswj rau kev ua haujlwm hauv kev ua haujlwm. Piv txwv li, nyob rau hauv cov ntaub ntawv kev sib txuas lus, peb ua hauj lwm ntawm ib tug point 3dB qis tshaj lub ncov, thiab nyob rau hauv kev sib txuas lus coherent, peb ua hauj lwm nyob rau hauv tsis muaj teeb meem. Txawm li cas los xij, txoj kev tswj cov theem sib txawv ntawm cov cua sov thiab cov cua kub dissipation los tswj cov teeb liab tso zis yuav siv sij hawm ntev heev thiab tsuas yog tsis tuaj yeem ua tau raws li peb qhov kev xav tau ntawm kev xa tawm 100Gpbs ib ob. Yog li ntawd, peb yuav tsum nrhiav txoj hauv kev kom ua tiav tus nqi nrawm dua ntawm kev hloov kho.
Cov hluav taws xob feem ntau muaj cov PN hlws ris seem uas yuav tsum tau hloov lub refractive index ntawm high zaus, thiab mus ncig teb chaws yoj electrode qauv uas phim qhov ceev ntawm hluav taws xob teeb liab thiab cov teeb liab optical. Lub hauv paus ntsiab lus ntawm kev hloov qhov refractive index yog cov nyhuv plasma dispersion, los yog hu ua dawb carrier dispersion nyhuv. Nws hais txog cov nyhuv ntawm lub cev uas thaum lub concentration ntawm cov khoom thauj dawb nyob rau hauv cov khoom siv semiconductor hloov, qhov tseeb thiab kev xav ntawm cov khoom siv nws tus kheej refractive index kuj hloov raws li. Thaum cov neeg nqa khoom concentration hauv cov khoom siv semiconductor nce, qhov nqus coefficient ntawm cov khoom nce ntxiv thaum qhov tseeb ntawm qhov refractive index txo. Ib yam li ntawd, thaum cov khoom siv hauv cov khoom siv semiconductor txo qis, qhov nqus coefficient txo qis thaum qhov tseeb ntawm qhov refractive index nce. Nrog rau cov txiaj ntsig zoo li no, hauv kev siv tswv yim, kev hloov pauv ntawm cov teeb liab siab zaus tuaj yeem ua tiav los ntawm kev tswj hwm tus naj npawb ntawm cov neeg nqa khoom hauv kev sib kis waveguide. Thaum kawg, 0 thiab 1 teeb liab tshwm sim ntawm qhov chaw tso zis, thauj khoom hluav taws xob ceev ceev mus rau qhov amplitude ntawm lub teeb siv. Txoj hauv kev kom ua tiav qhov no yog los ntawm kev sib tshuam PN. Cov neeg nqa khoom pub dawb ntawm cov ntshiab silicon muaj tsawg heev, thiab qhov kev hloov pauv ntawm qhov ntau yog tsis txaus kom tau raws li qhov kev hloov pauv ntawm qhov ntsuas refractive. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau ua kom cov cab kuj nyob rau hauv kev sib kis waveguide los ntawm doping silicon kom ua tiav qhov kev hloov pauv ntawm qhov ntsuas refractive, yog li ua tiav tus nqi siab dua.
Post lub sij hawm: May-12-2025