Lub coherent kho qhov muag kev sib txuas lus modulates lub teeb liab mus rau lub optical carrier los ntawm modulating lub amplitude, theem thiab zaus ntawm lub teeb liab nyob rau hauv txoj kev ntawm sab nraud lub teeb modulation (xws li DP-QPSK) ntawm qhov kawg xa.
Piv nrog rau cov txheej txheem kev tshawb pom ncaj qha, kev sib koom ua ke tuaj yeem tau txais cov ntaub ntawv xov xwm ntau dua los ntawm kev sib tw zaus ntawm lub teeb liab teeb liab thiab kev co hauv zos. Tom qab lub teeb liab tuaj txog ntawm qhov kawg tau txais, los ntawm kev siv lub tshuab hluav taws xob high-speed digital signal processing (DSP), los ntawm kev ua haujlwm hauv ntej xws li kev sib npaug, nws nkag mus rau qhov khoom siv kho qhov muag thiab cov teeb liab optical tsim los ntawm lub zos oscillator rau coherent mixing, thiaj li paub txog teeb liab reconstruction thiab distortion them.
Coherent optics muaj rau ob qho tib si100Gthiab400G daim ntawv thov, feem ntau vim nws ua rau cov neeg muab kev pabcuam xa cov ntaub ntawv ntau dua ntawm cov khoom siv kho qhov muag uas twb muaj lawm, txo tus nqi thiab qhov nyuaj ntawm kev hloov kho network rau kev nthuav dav bandwidth.
Qhov zoo tshaj plaws 1
Coherent nrhiav tau ua ke nrog DSP thev naus laus zis
• Tshem tawm cov kev txwv rau kev txais tos ib txwm muaj
• Ntau yam kev raug mob kis tau tuaj yeem them nyiaj rau hauv cov khoom siv hluav taws xob, ua kom yooj yim rau kev sib txuas
• Ua kom muaj kev txiav txim siab ntau hom qauv thiab polarization multiplexing
Qhov zoo tshaj plaws 2
Nyob rau tib lub sij hawm, daim ntawv thov ntawm kev txiav txim siab modulation scheme ua rau lub spectrum efficiency ntawm coherent kho qhov muag kev sib txuas lus siab tshaj ntawm cov tsoos system.
Lub coherent receiver tsis muaj qhov tshwj xeeb yuav tsum tau rau cov fiber ntau channel, yog li cov kab fiber ntau tuaj yeem siv rau hauv kev sib txuas lus kho qhov muag. Los ntawm txoj kev ntawm cov teeb liab ua cov algorithm, lub coherent receiver compensates lub teeb liab distortion los ntawm optical fiber dispersion, polarization hom dispersion thiab carrier theem suab nrov ntawm tus nqi me me.
Qhov zoo tshaj plaws 3
Lub coherence receiver yog hais txog 20dB ntau rhiab heevtshaj li tus txais tau zoo tib yam, yog li tsis muaj kev sib txuas hauv qhov sib kis yuav ntev dua, uas txo cov naj npawb ntawm amplification ntawm txoj kev kho qhov muag ntawm kev sib kis.
Raws li cov laj thawj saum toj no, kev sib txuas lus kho qhov muag tuaj yeem txo tus nqi ntawm kev kho qhov muag fiber ntau rau kev sib kis mus ntev, ua kom yooj yim rau kev tsim kho qhov muag thiab kev them nyiaj, thiab dhau los ua lub ntsiab lus siv tshuab raukis tau tus mob mus ntev network.
