Ultra-ntev WDM kis
Xyoo tsis ntev los no, WDM thev naus laus zis feem ntau nyob hauv ob qhov kev qhia rau ultra-ntev-ntau thiab lub peev xwm kis tau tus mob loj hlob, nyob rau hauv kev saib ntawm kev ua lag luam xav tau ultra-ntev nrug kis thiab lub network sib, ultra-ntev nrug kev daws teeb meem.
Ultra-ntev log kis tshuab
Ultra-ntev log kis tau zoo yog kev txwv kev tawg, cov teebmeem uas tsis yog thiab lwm yam kev cuam tshuam ntawm lub cev. Txhawm rau kom ua tiav kev sib kis ntev, yuav tsum nqa cov tshuab tsim nyog nyob rau hauv ob qho tib si lub davhlau ya nyob twg thiab kab rau kev ua.
Ntev-deb hluav taws xob xa cov chaw xa khoom
Thaum yuav tsum tau tsav kev sib tsuam sib txawv thiab cov khoom siv sib txawv deb kom pom kev sib txig sib luag, cia siab rau lub davhlau ya nyob twg ntawm cov khoom siv los txhim kho kev cuam tshuam kev zam qee lub sij hawm tseem tsis tuaj yeem daws cov teeb meem. Txij ntawm no mus, koj tuaj yeem xav txog kev siv hluav taws xob kho hluav taws xob, kev txhawb nqa kab ke los txhim kho kev cuam tshuam kev cuam tshuam.
EDC yog qhov kho qhov muag sau DCM dispersion kev them nyiaj rau lub luag haujlwm hloov mus rau thaj chaw hluav taws xob kom muaj kev sib haum xeeb, los ntawm kev siv cov peev txheej siab tsis zoo teb (FIR) thev naus laus zis, lub teeb liab kho qhov muag nyob hauv cov hluav taws xob ntev xa mus los ntawm kev siv hluav taws xob photoelectric hloov mus rau hluav taws xob cov cim ua tom qab Ib txoj hauv kev tshiab ntawm kev ua kom sib luag. Tam sim no, hluav taws xob hluav taws xob ua cov txheej txheem paub dispersion them nyiaj muaj kev ncaj tom ntej (FFE), rov qab sib npaug (DFE), qhov siab tshaj plaws yuav muaj kev txiav txim siab tshaj (MLSE), FFE thiab DFE kuj tseem siv tau cascaded.
WDM system rau kev xa cov teeb pom kev tsis pom, tab sis lawv kis tau hauv cov kab hluav taws xob, cov kab hluav taws xob nyob qee qhov kev siv bandwidth, txhua qhov kev cuam tshuam tsis muaj kev sib kis, cov demultiplexer thaum tau txais qhov kawg (sib npaug rau cov kho qhov muag-hla lim) ntau yam xim ntawm lub teeb tseg nyias. Txij li cov kho qhov muag tsawg zaus teeb liab qhov sib txawv yog qhov loj, cov neeg nyiam txhais qhov sib txawv ntawm qhov yoj ib ntus, uas yog hu ua wavelength division multiplexing. WDM no yeej tseem zoo heev zaus faib multiplexed kho qhov muag sau FDM thev naus laus zis. Txhua lub vias wavelength yog muab faib los ntawm cov zaus, txhua tus uas nyob ib qho fiber ntau channel wavelength bandwidth. WDM tshuab siv wavelength yog qhov sib txawv, uas yog, tshwj xeeb qauv wavelength, txhawm rau paub qhov txawv ntawm qhov dog dig wavelength SDH system, qee zaum hu ua xim cuam tshuam, thiab hais tias optical interface system ntawm lub teeb pom kev zoo yog "lub teeb dawb lub qhov ncauj" lossis "dawb lub qhov ncauj."
Thaum tib neeg tham txog WDM system, qee zaum tham nrog DWDM. WDM thiab DWDM yog ib lo lus siv nyob rau lub sijhawm sib txawv ntawm kev txhim kho WDM systems. Thaum xyoo 1980s, tib neeg xav thiab thawj qhov siv qis qis hluav taws xob muaj fiber ntau hauv ob lub qhov rais 1310nm thiab 1550nm qhov rai rau txhua lub qhov rais xa mus rau cov channel optical wavelength teeb liab yog 1310nm, 1550nm wavelength faib ob WDM system. Nrog rau sab nraud wavelengths 1550nm qhov rai EDFA kev ua lag luam, WDM system ua qhov sib txawv nqaim (feem ntau tsawg dua 1.6nm), thiab kev ua haujlwm nyob rau hauv lub qhov rais, sib koom EDFA optical amplifier.
Txhawm rau kom paub qhov txawv ntawm qhov WDM kev coj ua ib txwm, tib neeg hu lub voos hluav taws xob no ze zog WDM system rau DWDM system. Lub npe sib zog txhais tau tias sab nrawm sib nrug yoj yoj, yoj yoj yoj dhau ntawm WDM system yog ob peb lub kaum ntawm nm, lub caij nyoog yoj yoj tam sim no tsuas yog 0.4-2nm. DWDM thev naus laus zis yog qhov tseeb ntawm kev faib tshwj xeeb yoj yauv sib faib. Yog tias koj tsis tshwj xeeb 1310nm, 1550nm WDM WDM system ntawm ob sab nraud, tib neeg tham txog WDM system yog DWDM systems. WDM system ntxiv rau txhim kho kev sib kis tau zoo heev, tab sis kuj tuaj yeem txo tus nqi system, thiab nws cov ntsiab lus tseem ceeb yog:
(1) txuag nyiaj. EDFA pob tshab tuaj yeem ua rau ntau nthwv dej, yog li txo ntau tus naj npawb ntawm SDH tus tsim dua tshiab thiab txo tus nqi system. Hauv lub teb chaws kis rov qab, ntev npaum li cas qhov kev deb, kev txuag tus nqi ntau dua. Tshwj xeeb tshaj yog haum rau thaj av loj loj.
(2) txhim kho kev ntseeg tau ntawm qhov system. Txij li feem ntau ntawm cov photovoltaic ntaus ntawv WDM system, thiab muaj kev ntseeg siab ntawm cov khoom ntim photovoltaic, kom cov kev ntseeg tau zoo tuaj yeem lav tau.
(3) tuaj yeem ua rau kom nqa cov teeb liab nqa tau ua haujlwm. Txij li thaum WDM system txo cov kev hloov khoom siv hluav taws xob ntau, tshwj xeeb hauv SDH kev tsim kho dua tshiab, yog li txo cov khib nyiab ntau ntxiv, WDM cov cuab yeej ua tau zoo tsim kho kom ntseeg tau SDH cov neeg siv kev ua haujlwm tsis raug.
(4) tuaj yeem siv qhov loj loj ntawm cov xov paj fiber ntau, kom cov khoom siv hluav taws xob ib leeg los ua kom cov khoom siv sib kis ntau dua li cov kab hluav taws xob kis ib zaug mus rau ntau zaus.
(5) cov ntaub ntawv hom WDM channel yog pob tshab, piv txwv li, tsis muaj ib yam dab tsi ua nrog hluav taws xob teeb liab tus nqi tes hloov cov phiaj xwm. Lub kaw lus WDM tuaj yeem nqa tau ntau hom "kev lag luam" teeb liab, ATM, IP, lossis yav tom ntej yuav muaj lub teeb liab, WDM kis tau xa hluav taws xob yog qhov ua tiav kom tiav, rau "kev lag luam" cov paib qhia kev ua haujlwm, txhua yoj yoj WDM zoo li "virtual "optical fiber tib yam.
WDM thev naus laus zis tsis tuaj yeem lav tag nrho tag nrho cov-kis teeb liab xa xov sib kis deb, tam sim no, WDM teeb liab 2.5G lossis 10G, tom qab ntau dua 400-600 km kis, tab sis kuj tseem xav tau hluav taws xob rov txuas dua, nyob ntawm lub cuab yeej kom ntseeg tau tias kev sib kis ntawm txuas ntxiv hluav taws xob rau kev tsim hluav taws xob tom qab rov kis tau, tab sis nws yog kev tsis pom zoo tias tag nrho cov kab ke muaj qhov nyuaj thiab kim heev.
Hauv qhov kev xa xov ntev-ntev, kev ua kom rov ua dua tshiab yog zoo ib yam nrog nce cov nqi nkag. Cov hluav taws xob txuas tshiab hu ua hluav taws xob hais txog qhov kev ncua deb ntawm ob lub chaw nres tsheb tuaj yeem xa cov hluav taws xob rov qab tsim hluav taws xob ntev tshaj plaws. Rau cov kab ke WDM zoo tib yam, feem ntau txhua tom qab 80km muaj qhov kho qhov muag siv hluav taws xob EDFA amplification ntawm lub teeb liab lub teeb, kom tswj cov hluav taws xob txuas ntxiv ntev, yuav tsum tso cai kom ntau li ntau tau ntawm cov ntu ntawm cov ntu kho qhov muag thauj ntu. Qhov no zoo heev txo tus naj npawb ntawm photoelectric hloov dua siab tshiab, yog li txo cov nqi system.
Rau WDM kis tau tus mob, cov teeb meem loj tam sim no uas ua rau qhov kev sib kis tau raug txwv tsuas yog: OSNR OSNR, kev tawg thiab tsis pom kev. Kev rho tawm teeb meem tuaj yeem ua tiav los ntawm kev faib tawm kev them nyiaj fiber. Txwv tsis pub OSNR OSNR yog los ntawm kev qhia ntawm RAMAN amplifier, super FEC technology thiab daws tau.
Ultra-ntev log tsheb thauj mus los yog cov kauj ruam tseem ceeb rau hauv lub teeb xa mus, qhov tshwm sim tsis pom kev yog RAMAN amplifiers, super FEC, dispersion kev them nyiaj technology kev siv xws li kev txhim kho tshiab, ultra-ntev nrug kis tau zoo heev txo nqi thauj, txhim kho kev xa mus zoo thiab kev ntseeg tau ntawm cov kab ke sib deev. Thaj av thaj chaw tshwj xeeb rau Suav teb, lub teb chaws loj loj, cov thev naus laus zis muaj kev lag luam dav dav thiab cov ntawv thov.
