Kev sib piv ntawm CWDM thiab DWDM
Kev xa ib cov ntaub ntawv kwj ntawm cov khoom siv fais fab tuaj yeem ua nqi thiab ua haujlwm tsis txaus. Wavelength Division Multiplexing (WDM) kev siv tshuab tau ntau yam, cov ntaub ntawv ywj siab ntws los ntawm kev siv fais fab ntawm ib qho yooj yim kom zoo dua siv cov bandwidth ntawm cov khoom siv fiber ntau. Txhua cov kwj hauv qab yuav txais kev sib txawv ntawm lub teeb (tseem paub li lambda λ) thiab cov ntaub ntawv ntws taug kev mus los ntawm ib tus qauv muaj fiber ntau. Nrog WDM, ntau tus neeg xaj hluav taws xob tuaj yeem koom tib lub tshuab fais fab tib yam. Cov wavelength spaced muaj zog muab ntau dua kev sib txuas lus (los yog bandwidth) ib rab phom. Raws li lub wavelength nruam, WDM tshuab tau muab faib ua ob ntu: Coarse WDM (CWDM) thiab ntom WDM (DWDM). Tus ncej no yog xav ua kom sib piv ntawm CWDM thiab DWDM.
Txawm tias ob qho tibsi CWDM thiab DWDM siv ib tug neeg muab kev tshaj tawm nyob rau hauv lub tshuab xa xov mus koom nrog cov teeb liab, thiab ib qho kev sib tw ntawm cov neeg tuaj yeem faib rau lawv, lawv tseem muaj qhov sib txawv. Qhov no yuav muaj kev sib piv ntawm CWDM thiab DWDM los ntawm cov nram no.
Qhov txawv ntawm qhov Channel yog qhov sib txawv ntawm CWDM thiab DWDM. CWDM muaj kev sib tshuam channel, feem ntau 20 nm. DWDM muaj ntau lub navel wavelength spacing, feem ntau 0.8 nm. Nrog txoj kab sib tshuam channel, CWDM channel muaj nyob rau tib qhov txuas tau ho txo. Tab sis qhov nruab nrab ntawm qhov muag hauv CWDM network tsis tas yuav yog raws li hauv DWDM network. Yog li ntawd, kev koom tes CWDM network yog qhov pheej yig tshaj li kev faib tawm DWDM network. CWDM yog txhais los ntawm cov wavelengths, thaum DWDM txhais los ntawm cov zaus.
DWDM tau muab tso tawm cov lus tawm tswv yim txias (DFB), thaum CWDM yog ua raws li cov lus qhia tsis paub tseeb (DFB) lasers thiab cov kab nrig optical spectrum. Cov kev yees no muaj ntau yam zoo rau CWDM systems xws li qis dua qhov hluav taws xob, tsawg dua, thiab tsawg dua. Kev lag luam nyob rau ntawm CWDM systems uas muab cov txiaj ntsig no ua rau cov cuab yeej siv tau mus rau DWDM cov kev sib txuas rau ntau lub metro thiab cov ntawv thov nkag
CWDM nrug yog luv dua DWDM nrug. CWDM yog tsim los rau kev kis tau cov kab mob luv luv, tiam sis DWDM feem ntau tau siv rau hauv qhov kev siv kabmob uas muaj kabmob ultra ntev. DWDM qhov txuas tshaj plaws yog nyob ntawm cov khoom siv txuas, xws li DWDM EDFA, DCMs, VOAs, OADMs, etc. CWDM tsis tuaj yeem taug kev ntev vim tias CWDM wavelengths tsis tuaj yeem raug ntxiv nrog EDFA amplifiers, yog li ntawd CWDM nrug tsawg mus rau 100 mais (160 km).
Lus Cim: DWDM latency ntxiv yuav tshwm sim thaum lub sijhawm rov txhim kho hauv DWDM network.
Rau ntau SAN engineers, DWDM yog lub tswv yim zoo kawg li SAN ntxiv txij li nws muab cov scalability siab heev, qis heev thiab paub tseeb tseeb latency, thiab kev nrug nrab qis. CWDM qhov txiaj ntsim ntawm tseem ceeb tshaj plaws yog nws cov nqi qis. Nws yog ib qho pheej yig dua DWDM. Hauv lwm cov lus, CWDM yog qhov ua kom zoo rau cov nqi, thaum DWDM yog qhov ua kom pom zoo rau kev siv bandwidth. Rau cov chaw lag luam uas muaj cov tsos mob tsaus nti thiab tsuas muaj kev txwv qis xwb, CWDM yog ib txoj kev pheej yig kom ua tau cov haujlwm qis qis thiab muaj kev sib tshuam ntawm cov DCs. Ntxiv mus, CWDM kev ua tiav kuj ua rau txoj kev tsis sib dhos, kev teeb tsa, thiab kev lag luam dua li DWDM.
Txawm li cas los xij, saib ultra ntev-fibers, qhov twg tso fibers yuav ua tau loj peev ntawm kev sib kis tag nrho, cov nqi siab ntawm optical lasers tau loj tshaj plaws los ntawm high nqi ntawm fiber faib. Yog li, kis ntau tshaj ntawm wavelengths hauv txhua lub fiber yuav ua tiav qhov zoo tshaj plaws tus nqi txuag rau tag nrho lub cev. Tsis tas li ntawd, nyob rau hauv lub cev ntev, DWDM feem ntau muaj kev sib txuas nrog txhua hom kev kho qhov muag siab xws li EDFA thiab Raman Amplifiers, uas ua kom qhov teeb meem nyob rau hauv qhov chaw kho qhov muag tsis tau los ntawm txhua qhov kev hloov OEO raws li nyob rau hauv lub cev.
Tsis tas li, DWDM yog ib qho kev daws teeb meem uas tsim muaj ntau dua kev sib txuas thiab ntev dua, lossis kev txuas ntxiv, thaum muaj nqi ntau dua thaum lub CWDM yog ib qho kev siv nyiaj ntau rau cov metro lossis campus cov kev daws teeb meem.