DWDM (ntom nti ntom nti faib ua ntau yam sib xyaw ua ke) tuaj yeem sib txuas ua ke pab pawg ntawm optical wavelengths thiab xa lawv nrog cov fiber ntau. Qhov no yog lub tshuab laser siv los ua kom muaj bandwidth hauv cov kab hluav taws xob hauv cov kab ke tam sim no. Tshwj xeeb tshaj yog, cov txheej txheem yog multiplex lub ze spectral spacing ntawm ib tug neeg muaj fiber ntau nyob rau hauv ib daim kev cai fiber ntau kom zoo dua ntawm kev ua tiav kis tau zoo (piv txwv li, dispersion yam tsawg kawg nkaus los yog attenuation). Ua li no, raws li qhov muab cov ntaub ntawv sib kis muaj peev xwm, tag nrho cov xov tooj ntawm cov optical xav tau yuav raug txo kom tsawg.
Ib qhov zoo tseem ceeb ntawm DWDM yog tias nws cov qauv thiab kev ceev nrawm tsis cuam tshuam nrog. DWDM raws network tuaj yeem siv IP raws tu qauv, ATM, SONET / SDH, Ethernet raws tu qauv kom xa cov ntaub ntawv, thiab cov ntaub ntawv ntws nyob nruab nrab ntawm 100MB / s thiab 2.5gb / s. Nyob rau hauv txoj kev no, DWDM nyob rau hauv cov koom tes tuaj yeem xa cov sib txawv ntawm cov ntaub ntawv kev tsheb ntawm qhov nrawm sib txawv ntawm cov kab hluav taws xob laser. Los ntawm qhov pom ntawm kev ua haujlwm zoo (QoS), DWDM raws kev xaib tuaj yeem teb tau sai rau cov neeg siv' bandwidth yuav tsum thiab kab ke hloov pauv hauv txoj kev qes.
Dense wavelength division multiplexing (DWDM) yog ib hom wavelength division multiplexing (WDM) thev naus laus zis los nthuav cov peev xwm ntawm kev xa xov ntawm lub network kho qhov muag tam sim no. Nws muaj peev xwm multiplex ntau tus cab kuj kho qhov muag xa mus rau ib qho kho qhov muag fiber ntau rau kev xa, thiab tuaj yeem txuag tau ntau ntawm cov khoom siv fiber ntau hauv cov ntawv xa mus ntev. Tam sim no, feem ntau yog ob hom DWDM systems: passive DWDM system thiab nquag DWDM system.
Lub Neej DWDM Zog
Passive DWDM system tsis siv cov cuab yeej ua kom muaj zog xws li lub tshuab roj fiber ntau thiab cov kev faib khoom. Qhov kev sib kis deb ntawm lub system no tsuas yog xa los ntawm lub hwj chim sib kis ntawm optical module, tab sis nws muaj qhov zoo ntawm qhov muaj peev xwm siab channel. Nws yog tsuas yog siv nyob rau hauv tus txiv neej thiab kev sib kis high-speed kis kab mob nrog muaj peev xwm siab channel.
DWDM Txheej Txheem
DWDM lub zog yog ib hom kev kaw ua ke nrog rov ua dua, uas yog siv rau cov khoom siv hluav taws xob kho qhov muag (OEO) hloov dua siab tshiab. Ntxiv rau, lub kaw lus tseem nruab nrog ntau lub erbium-doped fiber ntau lub tshuab hluav taws xob (EDFAs) kom ntseeg tau tias qhov kawg tau txais tuaj yeem tau txais cov cim qhia tau zoo. Txawm li cas los xij, tus lej ntawm EDFA tau txwv los ntawm cov hom fiber ntau, cov xov tooj ntawm lub voj voos sib kis, qhov sib kis, qhov taw qhia-rau-suab nrov (OSNR) thiab lwm yam.
Qhov txuas txuas ntev ntawm DWDM system tsis yog tsuas yog cuam tshuam nrog cov xov tooj ntawm cov xov tooj cua thiab cov paib ua kom lub suab nrov (OSNR), tab sis kuj cuam tshuam los ntawm kev tawg ntawm cov teeb liab kho qhov muag. Yog li ntawd, hauv kev tsim qauv ntawm DWDM lub cev, qhov dispersion ntawm lub teeb liab kho qhov muag yuav tsum tau muab rau hauv. 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) yuav nce qhov tsis txaus ntawm cov kab hluav taws xob txuas thiab cuam tshuam kev sib kis nyob deb ntawm DWDM system.
Qhov zoo thiab qhov tsis zoo ntawm qhov ua tsis taus DWDM System
Txuag tus nqi: piv nrog cov DWDM caj qaum network nrog fiber ntau lub tshuab hluav taws xob thiab cov kev faib khoom tawg, passive DWDM tuaj yeem tsim qhov kev xa xov hluav taws xob siab nrog cov channel siab muaj peev xwm ntawm tus nqi qis.
Siv yooj yim: passive DWDM yog qhov ntsaws thiab kev ua si kaw lus, uas yooj yim thiab yooj yim rau siv.
Txawm li cas los xij, passive DWDM system muaj qee qhov tsis zoo nyob rau hauv cov hauv qab no.
Kev muaj peev xwm tshaj tawm: cov xov tooj ntawm lub wavelength channel hauv qhov system pass DWDM muaj tsawg. Yog tias koj xav nthuav lub network, koj yuav tsum siv cov cuab yeej DWDM qeeb qeeb, uas yuav ua rau muaj qhov nyuaj ntau dua ntawm kev tswj hwm qhov system.
Qhov zoo thiab qhov tsis zoo ntawm lub DWDM System
Kev ua haujlwm DWDM system txhawb nqa ntau dua cov kab hluav taws xob, yog li bandwidth loj dua thiab kev siv cov fiber ntau optical dua. Ntxiv rau, DWDM kev ua haujlwm yooj yim dua los tswj hwm, cov neeg siv tau tuaj yeem hloov kho cov channel wavelength online tsis kaw qhov kev kaw lus, thiab nthuav dav DWDM kev ua haujlwm tau yooj yim dua.
Piv nrog passive DWDM system, nquag DWDM system muaj kev sib kis tau ntev dua thiab tus nqi xa khoom zoo dua. Ntxiv rau, DWDM kev ua haujlwm tseem siv fiber ntau cov tshuab ua kom muaj zog, kev faib tawm cov khoom tsim tawm thiab lwm yam khoom siv, uas yog qhov nyuaj tshaj li qhov ua tsis muaj DWDM.
Passive DWDM system thiab nquag DWDM system muaj lawv qhov zoo. Peb yuav tsum tso cov txheej txheem DWDM tsim nyog raws li cov kev thov tshwj xeeb. Txawm hais tias lub system twg siv, DWDM multiplexer / demultiplexer yog qhov tseem ceeb.
HTF' s cov khoom lag luam zoo tau lees tias, thiab cov khoom siv siv tau yog txawv txawv.
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