Nyob rau hauv cov toj roob hauv pes hloov zuj zus ntawm kev sib txuas lus thiab cov ntaub ntawv xa mus, fiber ntau optic cables tau tshwm sim raws li tus qauv kub vim lawv qhov ceev tsis sib xws, bandwidth, thiab kev ntseeg tau. Cov kab hluav taws xob no siv cov ntsiab lus ntawm tag nrho cov kev xav sab hauv kom xa cov teeb liab teeb pom kev ntev nrog kev poob qis, hloov pauv txoj kev peb sib txuas lus thiab sib qhia cov ntaub ntawv. Tab sis ib qho ntawm cov lus nug uas nquag nug txog fiber ntau optic cables yog: Ntev npaum li cas lawv tuaj yeem khiav yam tsis muaj kev puas tsuaj loj hauv cov teeb liab zoo?
Nkag siab txog Fiber Optic Cable txwv
Qhov ntev tshaj plaws ntawm fiber ntau optic cable yuav khiav tau nyob ntawm ntau yam, nrog rau hom fiber ntau, lub wavelength ntawm lub teeb siv, thiab muaj cov optical amplifiers lossis repeaters. Hais lus dav dav, muaj ob lub ntsiab ntawm fiber ntau optic cables: ib hom thiab ntau hom.
Single-Mode Fiber (SMF): Tsim los nqa ib qho hluav taws xob ntawm lub teeb ntawm ib lub wavelength tshwj xeeb, feem ntau 1310 nm lossis 1550 nm, SMF muaj qhov sib kis tau ntev tshaj plaws. Nrog cov thev naus laus zis zoo li Erbium-Doped Fiber Amplifiers (EDFAs), ib hom fibers tuaj yeem ua tiav kev sib kis ntawm kaum mus rau ntau pua mais yam tsis muaj teeb liab rov tsim dua. Rau cov tshuab tsis muaj suab nrov, qhov kev txwv theoretical yog nyob ib ncig ntawm 20-40 mais ntawm 1310 nm thiab mus txog 120 mais ntawm 1550 nm vim qhov txo qis ntawm qhov wavelength no.
Multi-Mode Fiber (MMF): Cov cables no muaj ntau lub teeb rays lossis hom ib txhij, feem ntau ua haujlwm ntawm luv wavelengths xws li 850 nm lossis 1300 nm. Multi-mode fibers tsis tshua kim thiab yooj yim rau nruab tab sis muaj cov nqi attenuation ntau dua, txwv tsis pub lawv qhov kev sib kis tsis sib haum mus txog 2 mais ntawm 850 nm thiab mus txog 5-6 mais ntawm 1300 nm.
Tej yam uas cuam tshuam txog qhov deb
Attenuation: Qhov no yog qhov maj mam poob ntawm lub teeb liab lub zog thaum lub teeb mus los ntawm fiber ntau. Attenuation yog cuam tshuam los ntawm tej yam xws li cov khoom muaj pes tsawg leeg ntawm fiber, imperfections nyob rau hauv fiber ntau, thiab tej yam kev mob xws li kub thiab av noo.
Dispersion: Dispersion ua rau cov khoom sib txawv ntawm lub teeb liab mus rau qhov sib txawv ntawm qhov sib txawv, ua rau kev nthuav dav ntawm cov teeb liab mem tes. Chromatic dispersion, uas txawv nrog wavelength, tshwj xeeb tshaj yog nyob rau hauv ntev-ntev, ib-hom systems thiab yuav mitigated siv dispersion-compensating fibers los yog cov khoom tshwj xeeb.
Optical Amplifiers thiab Repeaters: Txhawm rau txuas ntxiv qhov ntau ntawm fiber ntau optic cables, optical amplifiers boost lub teeb liab lub zog yam tsis hloov nws mus rau ib qho hluav taws xob teeb liab, yog li khaws cia kev ncaj ncees ntawm lub teeb teeb liab. Repeaters, ntawm qhov tod tes, hloov lub teeb liab mus rau lub teeb liab hluav taws xob, ua kom nrov nrov, thiab tom qab ntawd hloov nws rov qab mus rau lub teeb. Ob lub thev naus laus zis yog qhov tseem ceeb rau kev sib txuas lus nyob deb.
Cable Specifications thiab Installation: Qhov zoo ntawm cov cable, connectors, splices, thiab tag nrho cov installation cov kev coj ua yuav cuam tshuam rau qhov siab tshaj plaws nyob deb. Cov kab hluav taws xob zoo nrog cov yam ntxwv tsis zoo thiab cov khoom sib txuas tau zoo ua kom pom kev ua haujlwm zoo.
Daim Ntawv Thov Ntiaj Teb tiag
Hauv kev xyaum, qhov deb ntawm fiber ntau optic cable tuaj yeem khiav tau yog feem ntau txiav txim siab los ntawm cov cai tshwj xeeb ntawm lub network. Metropolitan cheeb tsam tes hauj lwm (MANs) thiab kev lag luam tes hauj lwm feem ntau siv ntau hom fibers rau luv luv nyob rau hauv lub tsev los yog tsev kawm ntawv, thaum lub sij hawm ntev-haul caj qaum tes hauj lwm cia siab rau ib hom fibers nrog optical amplifiers mus rau span continents.
Kev nce qib hauv fiber ntau optic technology txuas ntxiv thawb cov ciam teb no. Piv txwv li, ultra-tsawg poob fibers thiab cov tswv yim tshiab amplification yog ua kom muaj kev ncua ntev dua yam tsis muaj teeb liab rov tsim dua tshiab. Kev tshawb fawb rau hauv qhov chaw sib faib multiplexing (SDM) thiab lwm yam thev naus laus zis tshiab tau cog lus tias yuav ua kom muaj peev xwm ntxiv thiab ncav cuag fiber ntau optic tes hauj lwm.
Xaus
Nyob rau hauv cov ntsiab lus, qhov siab tshaj plaws nyob deb ntawm fiber ntau optic cable yuav khiav tsis muaj teeb meem loj degradation nws txawv nyob ntawm seb hom fiber ntau, lub wavelength ntawm lub teeb siv, thiab kev koom ua ke ntawm optical amplifiers los yog repeaters. Thaum cov fibers ntau hom feem ntau txwv rau ob peb mais hauv cov tshuab tsis muaj suab nrov, ib hom fibers tuaj yeem ncav cuag kaum rau ntau pua mais nrog kev pab ntawm cov cuab yeej ua kom nrov nrov. Raws li kev siv thev naus laus zis, cov kev txwv no tau rov hais dua tas li, kom ntseeg tau tias fiber ntau optic cables tseem yog lub hauv paus ntawm kev sib txuas lus niaj hnub.