WDM wavelength division multiplexing yog hais txog kev nqa ntau lub vojvoog (channel) cov tshuab ntawm ib qho kho qhov muag, hloov ib qho optical fiber rau ntau qhov" virtual" cov xov, thiab txhua daim duab virtual ua haujlwm ntawm nws tus kheej ntawm txawv wavelengths. Vim tias qhov kev lag luam thiab kev ua tau zoo ntawm WDM cov cuab yeej siv, nws tau dhau los ua qhov kev siv tshuab hluav taws xob ntau tshaj plaws hauv kev sib txuas lus tam sim no.
WDM feem ntau muaj peb txoj hauv kev ua multiplexing, uas yog wavelength division multiplexing ntawm 1310 nm thiab 1550 nm, coarse wavelength faib multiplexing (CWDM) thiab ntom ntom ntom ntaws sib faib ntau yam (DWDM).
(1) 1 3 1 0nm thiab 1 550nm wavelength faib multiplexing
Qhov siv tshuab ntau dua no tsuas yog siv ob lub yoj tes rau thaum ntxov 1970 s: qhov ntev ntawm 1310 nm qhov rais thiab qhov ntev ntawm 1550 nm qhov rais. Kev siv WDM thev naus laus zis kom ua tiav ib qhov-fiber ntau lub qhov rai xa xov tooj yog kev siv thawj zaug ntawm wavelength faib multiplexing.
(2) Coarse wavelength faib multiplexing (CWDM)
CWDM thev naus laus zis yog hais txog WDM thev naus laus zis nrog kev sib tsuam sib luag loj ntev. Qhov kev ncua deb ntawm cov xov xwm nyob ib sab feem ntau ntau dua los yog sib luag ntawm 20 nm. Tus naj npawb ntawm lub wavelengths feem ntau yog 4 lossis 8 vuag, nrog qhov ntau ntawm 18 vuag. CWDM siv 1200 nm ~ 1700 nm qhov rai.
CWDM siv cov tshuab kaw lus tsis muaj lub teeb thiab cov tshuab hluav taws xob tsis yog kho qhov muag, tus nqi them qis dua DWDM; Qhov tsis zoo yog tias qhov peev xwm me me thiab qhov kis tau tus mob luv. Yog li ntawd, CWDM thev naus laus zis yog qhov tsim nyog rau kev ncua deb, kev siv bandwidth, thiab cov ntaub ntawv siv rau kev sib txuas lus, xws li kev sib txuas lus hauv pawg los yog hauv vaj tse.
(3) Lub Hauv Paus Cov Hluav Taws Xob Tawm Yeeb Yam Muaj Ntau Dua (DWDM)
Yooj yim muab, DWDM thev naus laus zis yog hais txog WDM thev naus laus zis nrog kev sib nrug me me ntawm qhov sib nrug wavelengths, thiab qhov ua haujlwm wavelength yog nyob hauv lub 1550 nm lub qhov rai. Nws tuaj yeem nqa 8 ~ 160 wavelengths ntawm ib qho fiber ntau. Mas siv cov tshuab mus ntev.
