Lub sijhawm 5G tau los txog. Yog tias cov tshuaj kho qhov muag ncaj qha txuas ncaj qha tau txais yuav, 5G fronthaul network yuav xav tau ntau cov fibers optical, uas tsis tsuas yog yuav tsum tau siv cov nqi xa mus siab, tab sis kuj cuam tshuam kev ua haujlwm tom qab thiab kev saib xyuas. Yog li ntawd, nyob rau hauv 5G era, nws yog ib qho tsim nyog los tshawb nrhiav cov kev daws teeb meem tshiab ntawm fronthaul bearer. Cov kev daws teeb meem pem hauv ntej hauv 5G era feem ntau suav nrog: optical fiber ncaj txuas, passive WDM, semi-active WDM thiab nquag WDM. Hnub no peb yuav qhia txog daim ntawv thov passive WDM hauv 5G fronthaul.
Passive wavelength faibmultiplexer(WDM) yog tsim los daws cov khoom siv fiber ntau rau kev sib kis mus ntev ntawm chav tsev faib (DU) thiab chav kav hlau txais xov (AAU) hauv centralized xov tooj cua nkag network (C-RAN) 5G fronthaul architecture Cov teeb meem tsis txaus, ntxiv rau, passive WDM tseem tuaj yeem txuag cov peev txheej fiber ntau. Nyob rau hauv passive WDM, cov xim kho qhov muag xim yog xa ncaj qha rau ntawm AAUs thiab DUs, thiab ntau AAUs tuaj yeem sib koom ib qho khoom siv fiber ntau rau kev xa mus los ntawm passive WDM yam tsis muaj lub hwj chim ntawm cov chaw taws teeb kawg. Passive WDM yog qhov kev daws teeb meem zoo tshaj plaws rau 5G fronthaul. Raws li qhov sib txawv wavelengths, 5G passive wavelength division multiplexers tuaj yeem muab faib ua CWDM (coarse wavelength division multiplexing), DWDM (dense wavelength division multiplexing), MWDM (midium yoj Division Multiplexing) thiab LWDN (Wavelength Division Multiplexing).
Kev thov ntawm WDM Network Topology hauv 5G Transmission
Lub passive WDM network topology hauv 5G kis tau tus mob muaj fronthaul thiab backhaul. Lub 5G fronthaul interconnects AAU / RRH (tus kav hlau txais xov chav tsev ua haujlwm / xov tooj cua chaw taws teeb lub taub hau) mus rau CU / BBU (central unit / baseband unit), thiab 5G backhaul interconnects CU / BBU mus rau cov tub ntxhais network.
Qhov zoo
Kev daws teeb meem ntawm kev nqa cov khoom siv WDM hauv 5G fronthaul muaj qhov zoo hauv qab no: siab bandwidth, kev ntseeg siab, tus nqi-zoo CPRI tus nqi, qis latency, tsis tshua muaj qhov tsis zoo, tsis tshua muaj nqi, 4/6/8/12/18/24/48 yeem raws, txuag fiber ntau, ntsaws thiab ua si, yooj yim rau nruab thiab xa tawm, yooj yim tswj
Daim ntawv thov Scenario
Passive WDM yog qhov tsim nyog rau qhov kawg-rau-kawg C-RAN network scenarios, thaj chaw uas tsis tshua muaj fibers optical, thiab thaj chaw uas tsis muaj cov kav dej. Muaj peev xwm thov scenarios rau passive WDM muaj xws li: 5G fronthaul, roj thiab roj, industrial, hluav taws xob fais fab, mining, cable TV, FTTx, passive optical network, thiab lwm yam. HTF tuaj yeem muab ntau hom passive WDM, thiab tuaj yeem kho lub hauv paus ntawm cov neeg siv khoom .
Txawv Passive WDM Solutions
Passive WDM cov kev daws teeb meem suav nrog CWDM,DWDM, MWDM and LWDM.
(1) CWM
CWDM siv wavelength multiplexing thev naus laus zis, uas muaj qhov zoo ntawm cov bandwidth siab, kev sib cais channel siab, tsis tshua muaj siab kub, thiab tus nqi qis. Nws ua rau cov neeg ua haujlwm xa tawm 18 bands ib txhij hauv ib khub ntawm optical fibers.
(2) DWDM
DWDM yog ib qho kev daws teeb meem uas muaj txiaj ntsig zoo nrog cov ntsiab lus nqus tau los ntawm cov lasers (EM). Nws nta muaj kev ntseeg siab thiab ruaj khov, kev sib cais channel siab, siab bandwidth, tsis tshua muaj qhov nkag thiab tsis yooj yim.
(3) MWDM
MWDM tsom rau thawj 6 wavelengths ntawm CWDM, compresses 20nm wavelength ncua sij hawm ntawm CWDM mus rau 7nm, thiab siv thermal electron cooler (TEC) kub tswj tshuab los nthuav 1 nthwv dej rau 2 nthwv dej, uas tuaj yeem txuag cov khoom siv fiber ntau thaum ua kom muaj peev xwm nce. .
(4) LWD
LWDM yog raws li Ethernet kev sib txuas lus wavelength division multiplexing (LAN WDM). Nws cov channel sib nrug yog 200 ~ 800GHz, uas nyob nruab nrab ntawm DWDM (100GHz, 50GHz) thiab CWDM (txog 3THz). LWDM muab kev ntseeg siab thiab ruaj khov, kev sib cais channel siab thiab tsis tshua muaj kev nkag. Ntxiv rau, LWDM tuaj yeem txhawb nqa 12-wave 25G kom muaj peev xwm thiab txuag fiber ntau.
In xaus
Passive WDM tuaj yeem pab daws teeb meem 5G pem hauv ntej-kawg kis tau tus mob los ntawm kev txuag cov peev txheej fiber ntau thiab txo cov nqi. Passive WDM tus nqi muaj xws li 10G, 25G, 40G, thiab 100G. Tsis tas li ntawd, passive WDM muaj qhov zoo ntawm kev ua haujlwm siab bandwidth, kev sib cais channel siab, qeeb qeeb, tsis muaj qhov tsis zoo, kev saib xyuas yooj yim, thiab kev xa tawm yooj yim.
