CWDM VS DWDM sib txawv txawv qhov txawv ntawm qhov sib nrug ntawm cov yoj ib puag ncig. DWDM ntim ntau cov channel rau hauv qhov pom kev me me, yov nyob rau 1 txog 2 nm sib nrug; DWDM cov tshuab txhawb nqa cov channel siab, tab sis kuj xav tau cov cuab yeej siv cua txias thiab cov lasers ywj pheej thiab cov qauv tsim kom ntseeg tau tias cov kab kev sib txuas tsis cuam tshuam. CWDM systems, ntawm qhov tod tes, siv 10 txog 25 nm spacing, nrog 1300 lossis 850 nm lasers uas nqus dej tsawg dua 0.1 nm / c. Qhov hluav taws xob tsawg no tshem tawm qhov xav tau rau cov khoom siv txias, uas, nyeg, txo tag nrho cov nqi system. Raws li qhov tshwm sim, CWDM systems txhawb qis tag nrho cov bandwidth tsawg dua li cov DWDM, tab sis nrog 8 txog 16 raws, txhua qhov ua haujlwm ntawm 155 Mbps thiab 3.125 Gbps mus txog 100 Gbps. Cov kev siv tshuab txhawb kev yoj yim, cov ntaub ntawv nce txog 2.5 Gbps toj ib ntu, thiab ncua deb txog 50 km.
CWDM siv cov lasers nrog cov dav dav CWDM wavelength spacing. Hauv kev sib piv, DWDM, uas tau siv dav hauv cov tes hauj lwm ntev thiab qee qhov sib txuas hauv xov tooj (tshwj xeeb cov neeg uas muaj qhov loj), siv cov lasers nrog ntau qhov sib nrug ntawm qhov ntev ntev, feem ntau 0.8 lossis 0.4 nm. Qhov dav dav qhov dav txav ntawm CWDM txhais tau tias kev txo nqi qis dua tuaj yeem ua tiav. Cov khoom siv qis dua tus nqi no yog qhov txiaj ntsig ntawm qhov qis dua CWDM mux / demux tus nqi (vim muaj kev zam ntau ntawm cov kev sib tsuam sib hloov thiab cov bandwidth).
CWDM sawv cev rau cov nuj nqis tseem ceeb-ntawm 25% rau 50% ntawm qib feem ntau dhau ntawm DWDM, ob qho tib si rau cov khoom lag luam OEMs thiab kev pabcuam. CWDM cov khoom lag luam raug nqi kwv yees li 3500 las toj ib ntus. Tsoos CWDM tsuas yog ntsuas txog yim yoj yuag, tab sis rau cov ntawv thov metro, qhov no yuav yog adaquare. Tsis tas li, mux demux cov chaw tsim khoom hauv Suav teb tau pom cov hauv kev los sib xyaw CWDM nrog nws li niaj zaus DWDM hniav uas tso cai rau cov tshuab ua kom txog li 20 lub yoj yuag. CWDM system architecture tuaj yeem muaj txiaj ntsig metro nkag mus rau kev lag luam vim tias nws tau siv cov khoom muaj nuj nqis ntawm cov khoom siv khoos phis tawm thiab tshem tawm qhov xav tau los tswj cov khoom sib txuas ua ke.
CWDM optical ntsiab ua tau yog raws li hauv qab no:
CWDM Uncooled Coaxial Lasers: Cov Tawm Tsam Tawm Tsam Cov Lus Pom Zoo ntau (zoo li DFB / MQW) lasers feem ntau siv hauv CWDM cov tshuab. Cov lasers feem ntau tuaj nyob rau hauv yim yoj yuag thiab muaj 13 nm bandwidth. Wavelength drift feem ntau tsuas yog 5 nm nyob rau hauv chaw haujlwm ib txwm ua haujlwm (hais, nrog 50 ℃ tag nrho qhov kub thiab txias), ua rau qhov ntsuas kub tsis tsim nyog. Txog kev txuag tus nqi ntxiv, cov lasers tsis tas yuav ua kev zam sab nraud lossis lwm yam kev lim dej kom ua tiav kev ua haujlwm CWDM. Lawv muaj nrog lossis tsis muaj kev sib cais.
CWDM Transmitters / Txais: OC-48 CWDM transmitters feem ntau siv cov DFB laser diode tsis raug thiab yog cov khoom siv pigtailed hauv cov qauv 24-tus pin DIP pob. Rau rau rau yim qhov chaw tau txais kev txhawb nqa (rau 6 raws: 1510 txog 1610 nm; ob qho txuas ntxiv yog nyob ntawm 1470 thiab ntawm 1490 nm.) OC-48 tus txais tau feem ntau siv APD photodetector, muaj cov hloov DC-DC hloov, thiab ntiav cov PLL rau cov xuab moos rov qab. Cov kev sib kis tau mus deb li 50 km tau ua tiav nrog cov qauv no.
CWDM Multiplexers / Demultiplexer: Cov no los hauv 4 lossis 8 channel module, tsuas yog 4 channel CWDM Multiplexer lossis 8 channel CWDM Multiplexer, feem ntau siv lim-lim lim zoo rau CWDM kev siv, nrog cov lim lim tau sib xws t lwm CWDM wavelengths. Lub tshuab lim dej yuav tsum tau tso cov yeeb yaj kiab qis thiab tsis muaj kev sib cais los ntawm cov chaw uas nyob ib sab.
CWDM Optical ADD / Poob Cov Qauv (OADMS): Cov no muaj nyob rau hauv ntau qhov kev teeb tsa nrog ib, ob, lossis plaub qhov ntxiv thiab tso cov channel siv tib cov yeeb yaj kiab nyias-lim raws li CWDM mux thiab demux modules.