Dense Wavelength Division Multiplexing (DWDM) yog lub nthwv dej sib faib sib faib sib tshooj (WDM) thev naus laus zis uas nthuav dav cov peev xwm kis ntawm cov xov tooj hluav taws xob optical fiber network. Nws tuaj yeem muaj cuab kav ua kom sib kis tau ntau lub koob xa hluav taws xob mus rau ib qho kho qhov muag tau txais rau kev sib kis. Txuag cov khoom siv fiber ntau hauv cov ntawv thov deb. Muaj ob hom tseem ceeb ntawm DWDM tam sim no: passive DWDM systems thiab DWDM systems nquag.
Passive DWDM system
Lub tshuab ua haujlwm passive DWDM tsis siv cov khoom siv nquag xws li cov tshuab hluav taws xob muaj zog thiab cov tshuab rho tawm. Qhov kev sib kis deb ntawm lub kaw lus no yuav txwv los ntawm lub zog hloov ntawm lub kho qhov muag ntawm lub ntsej muag, tab sis nws muaj qhov ua tau zoo ntawm cov peev txheej siab thiab feem ntau yog siv hauv nroog loj hauv cheeb tsam thiab cov Channel muaj peev xwm nyob rau hauv high-speed kis kab.
DWDM zog ua ke
DWDM kev ua haujlwm yog ib qho system uas muaj xws li transponder. Lub luag haujlwm ntawm transponder yog ua qhov hloov kho qhov muag hluav taws xob-hluav taws xob-kho qhov muag (OEO). Ntxiv rau, lub kaw lus tseem nruab nrog ntau lub erbium-doped fiber ntau lub tshuab hluav taws xob (EDFA) kom ntseeg tau tias qhov kawg tau txais tuaj yeem tau txais cov cim zoo, tab sis cov xov tooj ntawm erbium-doped fiber amplifiers (EDFA) yuav cuam tshuam los ntawm hom fiber ntau , tus naj npawb ntawm nthwv dej channel, Qhov kis tau tus mob, lub teeb liab-kom suab nrov (OSNR) thiab lwm yam cuam tshuam.
Qhov txuas txuas ntev ntawm DWDM kev ua haujlwm tsis yog tsuas yog cuam tshuam nrog cov xov tooj ntawm cov xov tooj hluav taws xob thiab cov teeb liab-kom nrov-suab (OSNR), tab sis kuj cuam tshuam los ntawm kev tawg ntawm lub teeb liab kho qhov muag. Yog li no, thaum tsim qauv DWDM kev ua haujlwm, kev faib tawm ntawm lub teeb liab kho qhov muag yuav tsum raug coj los xav. Yog tias tsim nyog, tus xa hluav taws xob lav (DCM) tuaj yeem raug ntxiv rau DWDM kev ua haujlwm. Nws yuav tsum raug sau tseg tias cov neeg tsim kev cuam tshuam dispersion (DCM) Nws yuav nce cov kab nkag tsis tau ntawm qhov kho qhov muag fiber ntau thiab muaj kev cuam tshuam kev kis tau tus mob nyob deb ntawm DWDM system.
