Hauv kev sib txuas lus, kev sib txuas ntawm cov ntaub ntawv hauv chaw khaws ntaub ntawv, thiab kev thauj mus los video, kev siv fiber optic cabling yog qhov xav tau heev. Txawm li cas los xij, qhov tseeb yog tias kev siv fiber optic cabling tsis yog qhov kev xaiv pheej yig lossis ua tau rau txhua qhov kev pabcuam. Yog li siv Wavelength Division Multiplexing (WDM) rau kev nthuav dav lub peev xwm ntawm cov fiber ntawm cov khoom siv fiber uas twb muaj lawm yog qhov zoo heev. WDM yog ib qho thev naus laus zis uas multiplexes ntau lub teeb liab optical rau ntawm ib lub fiber los ntawm kev siv cov wavelengths sib txawv ntawm lub teeb laser. Kev kawm sai ntawm WDM teb yuav raug muab tso rau ntawm CWDM thiab DWDM. Lawv yog raws li tib lub tswv yim ntawm kev siv ntau lub wavelengths ntawm lub teeb ntawm ib lub fiber. Tab sis lawv ob leeg muaj lawv qhov zoo thiab qhov tsis zoo.
CWDM yog dab tsi?
CWDM txhawb nqa txog li 18 txoj kab ntev uas xa mus los ntawm ib lub fiber tib lub sijhawm. Yuav kom ua tiav qhov no, cov kab ntev sib txawv ntawm txhua txoj kab yog 20nm sib nrug. DWDM, txhawb nqa txog li 80 txoj kab ntev sib txuas, nrog txhua txoj kab tsuas yog 0.8nm sib nrug. CWDM thev naus laus zis muab kev daws teeb meem yooj yim thiab pheej yig rau qhov luv dua txog li 70 kilometers. Rau qhov deb ntawm 40 thiab 70 kilometers, CWDM feem ntau tsuas yog txwv rau kev txhawb nqa yim txoj kab.
Ib lub kaw lus CWDM feem ntau txhawb nqa yim qhov ntev ntawm ib lub fiber thiab yog tsim los rau kev sib txuas lus luv luv, siv cov zaus dav dav nrog cov qhov ntev sib nrug deb.
Vim tias CWDM yog raws li 20-nm channel spacing los ntawm 1470 txog 1610 nm, nws feem ntau xa mus rau ntawm fiber spans txog li 80km lossis tsawg dua vim tias cov amplifiers optical tsis tuaj yeem siv nrog cov channel spacing loj. Qhov dav dav ntawm cov channel no tso cai rau kev siv cov optics pheej yig. Txawm li cas los xij, lub peev xwm ntawm cov kev sib txuas nrog rau qhov deb txhawb nqa tsawg dua nrog CWDM dua li nrog DWDM.
Feem ntau, CWDM yog siv rau cov nqi qis dua, muaj peev xwm qis dua (sub-10G) thiab cov ntawv thov luv dua qhov twg tus nqi yog qhov tseem ceeb.
Tsis ntev los no, cov nqi rau ob qho tib si CWDM thiab DWDM Cheebtsam tau sib piv zoo. CWDM wavelengths tam sim no muaj peev xwm thauj mus txog 10 Gigabit Ethernet thiab 16G Fiber Channel, thiab nws tsis zoo li yuav muaj peev xwm nce ntxiv yav tom ntej.
DWDM yog dab tsi?
Tsis zoo li CWDM, DWDM kev sib txuas tuaj yeem ua kom nrov dua thiab yog li ntawd, tuaj yeem siv rau kev xa cov ntaub ntawv mus deb dua.
Hauv DWDM systems, tus naj npawb ntawm cov multiplexed channels yog ntau denser dua li CWDM vim DWDM siv cov wavelength spacing tighter kom haum ntau cov channel rau ntawm ib lub fiber.
Es tsis txhob siv qhov sib nrug ntawm 20 nm channel siv hauv CWDM (sib npaug li kwv yees li 15 lab GHz), DWDM systems siv ntau yam kev sib nrug ntawm 12.5 GHz txog 200 GHz hauv C-Band thiab qee zaum L-band.
Cov kab ke DWDM niaj hnub no feem ntau txhawb nqa 96 txoj kab sib nrug ntawm 0.8 nm sib nrug hauv 1550 nm C-Band spectrum. Vim li no, DWDM systems tuaj yeem xa cov ntaub ntawv ntau heev los ntawm ib qho txuas fiber ntau vim lawv tso cai rau ntau qhov wavelengths kom ntim rau hauv tib lub fiber.
DWDM yog qhov zoo tshaj plaws rau kev sib txuas lus ntev txog li 120 km thiab dhau ntawd vim nws muaj peev xwm siv cov amplifiers optical, uas tuaj yeem ua kom zoo dua tag nrho 1550 nm lossis C-band spectrum feem ntau siv hauv DWDM daim ntawv thov. Qhov no kov yeej qhov ntev ntawm kev txo qis lossis qhov deb thiab thaum txhawb nqa los ntawm Erbium Doped-Fiber Amplifiers (EDFAs), DWDM systems muaj peev xwm nqa cov ntaub ntawv ntau hla qhov deb ntev txog li ntau pua lossis ntau txhiab kilometers.
Ntxiv rau qhov muaj peev xwm txhawb nqa ntau dua ntawm cov wavelengths dua li CWDM, DWDM platforms kuj tseem muaj peev xwm tswj hwm cov txheej txheem ceev dua vim tias feem ntau cov neeg muag khoom siv thauj khoom kho qhov muag niaj hnub no feem ntau txhawb nqa 100G lossis 200G ib qho wavelength thaum cov thev naus laus zis tshiab tso cai rau 400G thiab dhau ntawd.
DWDM vs CWDM wavelength spectrum:
CWDM muaj qhov sib nrug ntawm cov channel dav dua li DWDM -- qhov sib txawv ntawm zaus lossis wavelength ntawm ob txoj kab optical uas nyob ib sab.
Cov kab ke CWDM feem ntau thauj yim qhov ntev nrog qhov sib nrug ntawm 20 nm hauv daim phiaj spectrum los ntawm 1470 nm txog 1610 nm.
Cov kab ke DWDM, ntawm qhov tod tes, tuaj yeem nqa 40, 80, 96 lossis txog li 160 wavelengths los ntawm kev siv qhov sib nrug nqaim dua 0.8 / 0.4 nm (100 GHz / 50 GHz grid). DWDM wavelengths feem ntau yog los ntawm 1525 nm txog 1565 nm (C-band), nrog rau qee lub tshuab kuj muaj peev xwm siv wavelengths los ntawm 1570 nm txog 1610 nm (L-band).
Cov txiaj ntsig ntawm CWDM:
1. Tus nqi qis
CWDM pheej yig dua li DWDM vim yog tus 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 lag luam ntawm DWDM kuj siab dua CWDM. Yog li CWDM yog qhov kev xaiv zoo tshaj plaws rau cov neeg uas muaj kev txwv hauv kev nyiaj txiag.
2. Qhov Yuav Tsum Tau Siv Hluav Taws Xob
Piv nrog CWDM, qhov xav tau fais fab rau DWDM yog siab dua. Raws li DWDM lasers ua ke nrog cov khoom siv saib xyuas thiab tswj hwm siv li ntawm 4 W ib wavelength. Lub caij no, lub tshuab xa xov CWDM laser tsis txias siv li ntawm 0.5 W ntawm lub zog. CWDM yog ib qho thev naus laus zis passive uas tsis siv hluav taws xob. Nws muaj cov txiaj ntsig zoo rau cov neeg ua haujlwm hauv internet.
3. Kev Ua Haujlwm Yooj Yim
Cov kab ke CWDM siv cov thev naus laus zis yooj yim dua piv rau DWDM. Nws siv LED lossis Laser rau lub zog. Cov lim dej nthwv dej ntawm CWDM cov kab ke me dua thiab pheej yig dua. Yog li lawv yooj yim rau kev teeb tsa thiab siv.
Cov txiaj ntsig ntawm DWDM:
1. Kev Hloov Kho Dua Tshiab Yooj Yim
DWDM muaj kev ywj pheej thiab muaj zog nrog rau cov hom fiber. DWDM hloov kho mus rau 16 channel yog qhov ua tau ntawm ob qho tib si G.652 thiab G.652.C fibers. Chiv thawj los ntawm qhov tseeb tias DWDM ib txwm siv thaj tsam poob qis ntawm cov fiber. Thaum 16 channel CWDM systems cuam tshuam nrog kev sib kis hauv thaj tsam 1300-1400nm, qhov twg attenuation siab dua.
2. Kev nthuav dav
Cov kev daws teeb meem DWDM tso cai rau kev hloov kho dua tshiab hauv cov kauj ruam ntawm yim txoj kab mus rau qhov siab tshaj plaws ntawm 40 txoj kab. Lawv tso cai rau lub peev xwm tag nrho ntau dua ntawm cov fiber ntau dua li kev daws teeb meem CWDM.
3. Kev Kis Ntev Ntev
DWDM siv 1550 wavelength band uas tuaj yeem ua kom nrov dua siv cov amplifiers optical ib txwm muaj (EDFA's). Nws txhim kho qhov kev sib kis mus rau ntau pua kilometers.
Daim duab hauv qab no yuav muab rau koj qhov kev xav pom ntawm qhov sib txawv ntawm CWDM thiab DWDM.
Lub sijhawm tshaj tawm: Lub Rau Hli-14-2022