Ua ntej nkag siab txog PAM4 thev naus laus zis, kev hloov kho tshuab yog dab tsi? Modulation thev naus laus zis yog cov txheej txheem ntawm kev hloov cov teeb liab baseband (raws hluav taws xob teeb liab) rau hauv cov teeb liab kis. Txhawm rau kom ntseeg tau tias kev sib txuas lus zoo thiab kov yeej cov teeb meem hauv kev sib kis mus ntev, nws yog ib qho tsim nyog yuav tsum tau hloov lub teeb liab spectrum mus rau qhov kev sib tw siab los ntawm kev hloov kho rau kev sib kis.
PAM4 yog plaub qhov kev txiav txim siab pulse amplitude modulation (PAM) kev hloov kho.
PAM teeb liab yog lub teeb liab nrov kis tau tus mob tom qab NRZ (Tsis Rov Qab Los Zero).
Lub teeb liab NRZ siv ob theem teeb liab, siab thiab qis, los sawv cev rau 1 thiab 0 ntawm cov teeb liab logic, thiab tuaj yeem xa 1 me ntsis ntawm cov ntaub ntawv logic ib lub voj voog moos.
PAM4 teeb liab siv 4 theem teeb liab sib txawv rau cov teeb liab kis tau tus mob, thiab txhua lub voj voog moos tuaj yeem xa 2 cov ntaub ntawv logic, uas yog 00, 01, 10, thiab 11.
Yog li ntawd, nyob rau hauv tib lub baud tus nqi tej yam kev mob, tus nqi me ntsis ntawm PAM4 teeb liab yog ob zaug ntawm NRZ teeb liab, uas ua rau ob npaug rau kev sib kis tau zoo thiab txo cov nqi.
PAM4 thev naus laus zis tau siv dav hauv kev ua haujlwm siab ceev teeb liab sib cuam tshuam. Tam sim no, muaj 400G optical transceiver module raws li PAM4 modulation technology rau cov ntaub ntawv chaw thiab 50G optical transceiver module raws li PAM4 modulation technology rau 5G interconnection network.
Kev siv cov txheej txheem ntawm 400G DML optical transceiver module raws li PAM4 kev hloov pauv yog raws li hauv qab no: thaum xa cov cim qhia hauv tsev, qhov tau txais 16 raws ntawm 25G NRZ hluav taws xob cov teeb liab yog cov tswv yim los ntawm chav tsev hluav taws xob interface, preprocessed los ntawm DSP processor, PAM4 modulated, thiab tso zis 8 raws ntawm 25G PAM4 hluav taws xob teeb liab, uas yog loaded mus rau tus tsav nti. Cov teeb liab hluav taws xob kub ceev tau hloov mus rau 8 raws ntawm 50Gbps high-speed optical signals los ntawm 8 channels ntawm lasers, ua ke los ntawm wavelength division multiplexer, thiab ua ke rau hauv 1 channel ntawm 400G high-speed optical teeb liab tso zis. Thaum tau txais cov cim qhia hauv tsev, qhov tau txais 1-channel 400G high-speed optical teeb liab yog cov tswv yim los ntawm chav kho qhov muag interface, hloov mus rau 8-channel 50Gbps high-speed optical teeb liab los ntawm demultiplexer, tau txais los ntawm optical receiver, thiab hloov mus rau hauv hluav taws xob. teeb liab. Tom qab moos rov qab, kev nthuav dav, sib npaug, thiab PAM4 demodulation los ntawm DSP ua cov nti, cov teeb liab hluav taws xob hloov mus rau 16 raws ntawm 25G NRZ hluav taws xob teeb liab.
Siv PAM4 modulation technology rau 400Gb / s optical modules. Lub 400Gb / s optical module raws li PAM4 kev hloov kho tuaj yeem txo tus lej ntawm cov lasers xav tau ntawm qhov kawg xa tawm thiab sib raug zoo txo tus naj npawb ntawm cov neeg txais yuav tsum tau txais thaum kawg vim yog siv cov txheej txheem kev txiav txim siab dua piv rau NRZ. PAM4 modulation txo cov naj npawb ntawm cov khoom siv kho qhov muag hauv qhov kho qhov muag module, uas tuaj yeem ua rau muaj txiaj ntsig zoo xws li cov nqi sib dhos qis, txo kev siv hluav taws xob, thiab ntim me me.
Muaj qhov kev thov rau 50Gbit / s optical modules hauv 5G kis tau tus mob thiab backhaul networks, thiab kev daws teeb meem raws li 25G optical li thiab ntxiv los ntawm PAM4 pulse amplitude modulation hom yog saws kom ua tiav cov nqi qis thiab siab bandwidth.
Thaum piav txog PAM-4 cov teeb liab, nws yog ib qho tseem ceeb uas yuav tau xyuam xim rau qhov sib txawv ntawm baud tus nqi thiab tus nqi me ntsis. Rau cov cim NRZ ib txwm muaj, txij li ib lub cim xa ib me ntsis ntawm cov ntaub ntawv, tus nqi me ntsis thiab tus nqi baud yog tib yam. Piv txwv li, nyob rau hauv 100G Ethernet, siv plaub 25.78125GBaud signals rau kev sib kis, tus nqi me ntsis ntawm txhua lub teeb liab kuj yog 25.78125Gbps, thiab plaub lub teeb liab ua tiav 100Gbps teeb liab kis tau tus mob; Rau PAM-4 cov cim, txij li ib lub cim xa 2 cov ntaub ntawv, tus nqi me ntsis uas tuaj yeem kis tau yog ob npaug ntawm baud tus nqi. Piv txwv li, siv 4 raws ntawm 26.5625GBaud cov teeb liab rau kev sib kis hauv 200G Ethernet, tus nqi me ntsis ntawm txhua tus channel yog 53.125Gbps, thiab 4 channel ntawm cov teeb liab tuaj yeem ua tiav 200Gbps teeb liab kis tau tus mob. Rau 400G Ethernet, nws tuaj yeem ua tiav nrog 8 raws ntawm 26.5625GBaud cov cim.
Post lub sij hawm: Jan-02-2025