Dense Wavelength Division Multiplexing (DWDM) yog lub wavelength division multiplexing (WDM) thev naus laus zis uas nthuav dav kev sib kis ntawm cov khoom siv kho qhov muag uas twb muaj lawm. Txuag ntau cov peev txheej fiber ntau hauv cov ntawv thov kev sib kis. Tam sim no muaj ob lub ntsiab ntawm DWDM systems: passive DWDM systems thiab nquagDWDMtshuab.
Passive DWDM systems
Cov khoom nquag xws li fiber ntau amplifiers thiab dispersion compensators tsis siv nyob rau hauv passive DWDM systems. Qhov kev ncua deb ntawm cov kab ke no yuav raug txwv los ntawm kev xa xov hluav taws xob ntawm cov khoom siv kho qhov muag, tab sis nws muaj qhov zoo ntawm cov channel muaj peev xwm thiab feem ntau yog siv nyob rau hauv cheeb tsam cheeb tsam network thiab high-speed networks. channel muaj peev xwm nyob rau hauv high-speed kis kab.
Active DWDM yog ib qho system uas suav nrog cov transponders ua qhov kev hloov kho qhov muag-hluav taws xob-kho qhov muag (OEO). Tsis tas li ntawd, muaj ntau yam erbium-doped fiber ntau amplifiers (EDFA) nyob rau hauv lub kaw lus kom ntseeg tau tias qhov kawg tau txais yuav tau txais qhov zoo tshaj plaws optical signals, tab sis tus naj npawb ntawm erbium-doped fiber amplifiers (EDFA) yuav raug cuam tshuam los ntawm hom fiber ntau. , tus naj npawb ntawm wavelength channels, Transmission rate, signal-to-noise ratio (OSNR) thiab lwm yam.
Qhov txuas ntev ntawm ib qho kev ua haujlwm DWDM tsis yog tsuas yog cuam tshuam nrog cov xov tooj ntawm fiber ntau amplifiers thiab lub teeb liab-rau-suab nrov piv (OSNR), tab sis kuj mus rau dispersion ntawm lub teeb liab optical. Yog li ntawd, thaum tsim ib tug active DWDM system, qhov dispersion ntawm optical teeb liab yuav tsum tau muab coj mus rau hauv tus account. Yog tias tsim nyog, lub dispersion compensator (DCM) tuaj yeem muab ntxiv rau hauv DWDM system. Nws yuav tsum tau muab sau tseg hais tias lub dispersion compensator (DCM) Nws yuav ua rau kom cov insertion poob ntawm qhov kho qhov muag fiber txuas, thiab tseem yuav cuam tshuam qhov kev ncua deb ntawm lub active DWDM system.
