Cov fiber txheem tau txais cov ntaub ntawv thoob ntiaj teb rau bandwidth, dhau tag nrho cov tsheb khiav hauv internet thoob ntiaj teb

Ib pab neeg tshawb fawb los ntawm Lub Koom Haum Tshawb Fawb Txog Kev Sib Txuas Lus Hauv Is Taws Nem ntawm Nyiv Pooj Lub Koom Haum Saib Xyuas Kev Siv Tshuab Xov Xwm thiab Kev Sib Txuas Lus (NICT) tau ua tiav cov ntaub ntawv tshiab thoob ntiaj teb ntawm 1.53 Pbit/s ntawm cov fiber ntau optical uas muaj txoj kab uas hla ib txwm. Qhov no txhais tau tias tag nrho cov tsheb khiav hauv internet thoob ntiaj teb tuaj yeem haum rau hauv nws.
Ib qho kev tshawb pom zoo sib xws tau tshaj tawm ob lub lis piam dhau los: bandwidth ntawm 1.84 Pbit / s tau ua tiav nrog ib lub laser thiab ib lub chip optical, tus nqi siab dua li qhov ua tiav los ntawm ICTs, tab sis qhov teeb meem yog tias nws tseem yog kev sim. Photonic chips nyob rau theem tsim; yog li ntawd, qhov kev tshawb fawb ICT no tuaj yeem siv tau sai dua.

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Kev siv tshuab Multiplexing: ua tiav cov ntaub ntawv bandwidth ntawm 1.53 Pbit/s
Cov kws tshawb nrhiav tau txais bandwidth kwv yees li 1.53 Pbit/s los ntawm kev encode cov ntaub ntawv hla 55 qhov sib txawv optical frequencies (ib txoj kev hu ua multiplexing). Qhov ntawd yog bandwidth txaus los nqa tag nrho lub ntiaj teb internet traffic (kwv yees tsawg dua 1 Pbit/s) los ntawm ib txoj fiber optic cable - ib lab npaug zoo dua li kev sib txuas gigabit (qhov zoo tshaj plaws) uas tus neeg nruab nrab muaj.
Cov thev naus laus zis ua haujlwm los ntawm kev siv cov zaus sib txawv ntawm lub teeb thoob plaws lub spectrum. Vim tias txhua "xim" hauv lub spectrum (pom thiab tsis pom) muaj nws tus kheej zaus, tsis zoo li txhua lwm zaus, nws tuaj yeem nqa nws tus kheej cov ntaub ntawv ywj pheej. Cov kws tshawb fawb tau ua tiav qhov ua tau zoo ntawm spectral ntawm 332 bits / s / Hz (bits ib ob ib Hertz), peb zaug siab dua lawv qhov kev sim zoo tshaj plaws yav dhau los hauv xyoo 2019, uas tau ua tiav qhov ua tau zoo ntawm spectral ntawm 105 bits / s / Hz.

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Kev teeb tsa sim: Kev xa cov ntaub ntawv C-band ntawm 184 qhov wavelengths sib txawv
Cov kws tshawb nrhiav tau ua tiav xa cov ntaub ntawv C-band hla 184 qhov wavelengths sib txawv: cov zaus ywj pheej, tsis sib tshooj no yog siv los xa cov ntaub ntawv tib lub sijhawm hauv cov fiber optic cable. Lub teeb raug modulated kom xa 55 cov kwj deg sib cais (qauv) ntawm cov ntaub ntawv ua ntej xa mus rau hauv cov fiber optic cable. Thaum modulated (zoo li feem ntau cov fiber optic cables tam sim no xa tawm), nws xav tau lub iav core los nqa tag nrho cov ntaub ntawv. Thaum cov ntaub ntawv (spannings 184 wavelengths thiab 55 hom) raug xa mus, lub receiver decodes cov wavelengths sib txawv thiab hom los sau nws cov ntaub ntawv. Hauv kev sim, qhov deb ntawm lub transmitter thiab receiver tau kho ntawm 25.9 km.

① Qhov chaw sib txuas ntawm lub teeb pom kev zoo: 184 tus neeg nqa khoom tau tsim nyob rau hauv qhov chaw sib txuas ntawm lub teeb pom kev zoo. ② Kev hloov kho lub teeb liab: Tus neeg nqa khoom tau hloov kho nrog 16 QAM teeb liab thiab multiplexed polarization. ③ Kev tsim teeb liab sib luag: Cov teeb liab rau txhua hom tau faib, thiab kev ncua sijhawm ntawm txoj kev tau siv los ua kom pom cov ntaub ntawv ywj pheej. ④ Hom multiplexer: Txhua lub teeb liab tau hloov mus rau hauv hom chaw sib txawv thiab xa mus rau 55-hom fiber. ⑤ 55-hom fiber: Lub teeb liab kis mus rau hauv 25.9-kilometer-ntev 55-hom fiber. ⑥ Hom demultiplexer: Ntawm lub receiver, lub teeb liab tau sib cais mus rau hauv txhua hom chaw thiab hloov mus rau hom tseem ceeb. ⑦ High-speed parallel receiver: Lub teeb liab hom-demultiplexed yog wavelength-demultiplexed los ntawm lub lim dej thiab hloov mus rau hauv lub teeb liab hluav taws xob los ntawm lub receiver sib xws. ⑧ Offline teeb liab ua tiav. MIMO ua tiav kom tshem tawm cov teeb liab cuam tshuam thaum lub sijhawm sib kis fiber.

Cov txiaj ntsig ntawm kev sim qhia tau tias txawm hais tias tus nqi ntawm cov ntaub ntawv poob qis me ntsis ntawm qhov kawg ntawm qhov ntev ntawm C band (kwv yees li 1565 nm), tus nqi ntawm cov ntaub ntawv ruaj khov thiab yuav luag sib npaug tau txais hauv lwm thaj chaw ntawm qhov ntev, ncav cuag tag nrho ntawm 1.53 Pbit / s tom qab kho qhov yuam kev.