Hauv kev sib txuas lus, kev sib txuas ntawm cov ntaub ntawv, thiab kev thauj mus los video, fiber ntau optic cabling yog qhov xav tau. Txawm li cas los xij, qhov tseeb yog tias cov fiber ntau optic cabling tsis yog kev lag luam lossis kev xaiv ua tau los siv rau txhua qhov kev pabcuam. Yog li siv Wavelength Division Multiplexing (WDM) rau kev nthuav dav lub peev xwm ntawm cov fiber ntau ntawm cov khoom siv fiber ntau uas twb muaj lawm yog qhov pom zoo. WDM yog ib qho kev siv tshuab uas muab ntau yam teeb liab kho qhov muag mus rau ib qho fiber ntau los ntawm kev siv cov wavelengths sib txawv ntawm lub teeb laser. Kev kawm ceev ntawm WDM teb yuav muab tso rau ntawm CWDM thiab DWDM. Lawv ua raws tib lub tswv yim ntawm kev siv ntau lub wavelengths ntawm lub teeb ntawm ib lub fiber ntau. Tab sis lawv ob leeg muaj lawv qhov zoo thiab qhov tsis zoo.
CWDM yog dab tsi?
CWDM txhawb nqa txog li 18 lub wavelength raws kis los ntawm fiber ntau tib lub sijhawm. Txhawm rau ua tiav qhov no, qhov sib txawv wavelengths ntawm txhua channel yog 20nm sib nrug. DWDM, txhawb nqa txog 80 ib txhij wavelength raws, nrog rau txhua qhov sib nrug tsuas yog 0.8nm. CWDM thev naus laus zis muab cov kev daws teeb meem yooj yim thiab raug nqi rau kev ncua luv txog li 70 mais. Rau qhov kev ncua deb ntawm 40 thiab 70 kilometers, CWDM zoo li txwv rau kev txhawb nqa yim channel.
CWDM system feem ntau txhawb yim wavelengths ib fiber ntau thiab yog tsim los rau kev sib txuas lus luv luv, siv ntau zaus nrog wavelengths sib nrug deb.
Txij li thaum CWDM yog raws li 20-nm channel qhov sib nrug ntawm 1470 txog 1610 nm, nws feem ntau yog siv los ntawm fiber ntau mus txog 80km lossis tsawg dua vim tias optical amplifiers tsis tuaj yeem siv nrog qhov sib txawv loj. Qhov dav dav ntawm cov channel no tso cai rau kev siv cov khoom siv qis qis. Txawm li cas los xij, lub peev xwm ntawm cov kev sib txuas nrog rau qhov kev ncua deb yog tsawg dua nrog CWDM dua li nrog DWDM.
Feem ntau, CWDM yog siv rau tus nqi qis, qis peev xwm (sub-10G) thiab daim ntawv thov luv luv uas tus nqi yog qhov tseem ceeb.
Tsis ntev los no, cov nqi rau ob qho tib si CWDM thiab DWDM Cheebtsam tau dhau los ua qhov sib piv. CWDM wavelengths tam sim no muaj peev xwm thauj mus txog 10 Gigabit Ethernet thiab 16G Fiber Channel, thiab nws tsis zoo li qhov peev xwm no ntxiv rau yav tom ntej.
DWDM yog dab tsi?
Tsis zoo li CWDM, DWDM kev sib txuas tuaj yeem nthuav dav thiab tuaj yeem siv tau rau kev xa cov ntaub ntawv ntev dua.
Nyob rau hauv DWDM systems, tus naj npawb ntawm multiplexed channel yog ntau denser dua CWDM vim DWDM siv nruj dua wavelength spacing kom haum ntau raws mus rau ib tug fiber ntau.
Hloov chaw ntawm 20 nm channel sib nrug siv hauv CWDM (sib npaug li kwv yees li 15 lab GHz), DWDM cov tshuab siv ntau hom kev sib txawv ntawm 12.5 GHz mus rau 200 GHz hauv C-Band thiab qee zaum L-band.
Niaj hnub no DWDM systems feem ntau txhawb 96 raws qhov sib nrug ntawm 0.8 nm sib nrug hauv 1550 nm C-Band spectrum. Vim li no, DWDM cov tshuab tuaj yeem xa cov ntaub ntawv ntau dhau los ntawm ib qho kev sib txuas ntawm fiber ntau raws li lawv tso cai rau ntau lub wavelengths kom tau ntim rau tib lub fiber ntau.
DWDM yog qhov zoo tshaj plaws rau kev sib txuas lus ntev txog 120 km thiab dhau mus vim nws lub peev xwm los siv cov khoom siv kho qhov muag, uas tuaj yeem raug nqi-ua kom zoo dua rau tag nrho 1550 nm lossis C-band spectrum feem ntau siv hauv DWDM daim ntawv thov. Qhov no kov yeej qhov kev ncua ntev ntawm kev txo qis lossis kev ncua deb thiab thaum txhawb nqa los ntawm Erbium Doped-Fiber Amplifiers (EDFAs), DWDM systems muaj peev xwm nqa tau cov ntaub ntawv ntau dhau ntawm qhov ntev mus txog ntau pua lossis ntau txhiab mais.
Ntxiv rau qhov muaj peev xwm txhawb nqa ntau lub wavelengths ntau dua li CWDM, DWDM platforms kuj muaj peev xwm tuav cov txheej txheem ceev dua li cov neeg muag khoom siv kho qhov muag feem ntau niaj hnub no feem ntau txhawb 100G lossis 200G ib lub wavelength thaum cov thev naus laus zis tshiab tau tso cai rau 400G thiab dhau mus.
DWDM vs CWDM wavelength spectrum:
CWDM muaj qhov dav dav dav dua li DWDM - qhov sib txawv ntawm qhov zaus lossis wavelength ntawm ob qhov chaw kho qhov muag uas nyob ib sab.
CWDM systems feem ntau thauj yim wavelengths nrog ib tug channel sib nrug ntawm 20 nm nyob rau hauv spectrum grid los ntawm 1470 nm mus rau 1610 nm.
DWDM systems, ntawm qhov tod tes, tuaj yeem nqa 40, 80, 96 lossis mus txog 160 wavelengths los ntawm kev siv qhov sib nrug ntau dua 0.8 / 0.4 nm (100 GHz / 50 GHz daim phiaj). DWDM wavelengths feem ntau yog los ntawm 1525 nm mus rau 1565 nm (C-band), nrog rau qee lub tshuab kuj muaj peev xwm siv wavelengths los ntawm 1570 nm txog 1610 nm (L-band).
CWDM Qhov Zoo:
1. Tus nqi qis
CWDM yog pheej yig dua li DWDM vim cov nqi kho vajtse. CWDM system siv cov lasers txias uas pheej yig dua li DWDM uncooled lasers. Tsis tas li ntawd, Tus nqi ntawm DWDM transceivers feem ntau yog plaub lossis tsib zaug kim dua li ntawm lawv cov CWDM modules. Txawm tias tus nqi khiav haujlwm ntawm DWDM yog siab dua CWDM. Yog li CWDM yog qhov kev xaiv zoo tshaj plaws rau cov neeg uas muaj kev txwv nyiaj txiag.
2. Xav tau lub hwj chim
Piv nrog CWDM, lub zog xav tau rau DWDM yog qhov siab dua. Raws li DWDM lasers ua ke nrog kev saib xyuas thiab tswj kev siv hluav taws xob nyob ib puag ncig 4 W ib lub wavelength. Lub caij no, lub tshuab hluav taws xob tsis zoo CWDM laser siv li 0.5 W ntawm lub zog. CWDM yog ib qho kev siv thev naus laus zis uas tsis siv hluav taws xob. Nws muaj kev cuam tshuam nyiaj txiag zoo rau cov neeg siv internet.
3. Kev ua haujlwm yooj yim
CWDM systems siv cov thev naus laus zis yooj yim nrog kev hwm rau DWDM. Nws siv LED lossis Laser rau lub zog. Cov yoj lim dej ntawm CWDM systems yog me dua thiab pheej yig dua. Yog li lawv yooj yim rau nruab thiab siv.
Qhov zoo ntawm DWDM:
1. Hloov kho yooj yim
DWDM yog yoog raws thiab muaj zog nrog kev hwm rau hom fiber ntau. DWDM hloov mus rau 16 raws yog siv tau ntawm G.652 thiab G.652.C fibers. Keeb xeeb los ntawm qhov tseeb tias DWDM ib txwm ua haujlwm rau thaj tsam poob qis ntawm cov fiber ntau. Thaum 16 channel CWDM systems koom nrog kev sib kis hauv cheeb tsam 1300-1400nm, qhov twg attenuation yog siab dua.
2. Scalability
DWDM cov kev daws teeb meem tso cai rau kev hloov kho hauv cov kauj ruam ntawm yim raws mus rau qhov siab tshaj plaws ntawm 40 raws. Lawv tso cai rau tag nrho cov peev txheej ntau dua ntawm cov fiber ntau dua li cov tshuaj CWDM.
3. Ntev kis tau tus mob
DWDM ntiav 1550 wavelength band uas tuaj yeem nthuav dav siv cov khoom siv kho qhov muag (EDFA's). Nws txhim khu kev sib kis mus rau ntau pua kilometers.
Cov duab hauv qab no yuav ua rau koj pom qhov pom ntawm qhov sib txawv ntawm CWDM thiab DWDM.
Post lub sij hawm: Jun-14-2022