Lub hauv paus ntawm multimode fiber yog tuab, qhov kis tau tus mob yog tsawg, qhov deb yog luv, qhov kev sib kis tau tag nrho yog qhov tsis zoo, tab sis nws tus nqi kuj tsis tshua muaj, nws feem ntau siv nyob rau hauv ib puag ncig ntawm cov vaj tsev lossis thaj chaw nyob ib puag ncig. Lwm hom optical fiber nrog lub cheeb ntawm 1310nm lossis 850nm yog qhov yooj yim rau kev ua haujlwm nrog. Nws tuaj yeem kis ntau hom kev hloov ntawm qhov muab yoj yoj. Piv nrog sib txig sib txuam, cov roj hmab multimode tuaj yeem txhawb kev sib kis ntev. Hauv 10 Mbps thiab 100 Mbps Ethernet, multimode fiber tuaj yeem pab txhawb kev xa mus ntev tshaj li ntawm 2000 meters. Cov tub ntxhais qhov ntev ntev ntawm cov khoom siv ua ke ntau ua ke yog 50 μ m, 62.5 μ m thiab 100 μ M.
Ib hom kho qhov muag fiber ntau tsuas tso cai rau ib qho nqaj ntawm lub teeb mus rau kev faib tawm, yog li ib hom fiber ntau tsis muaj hom kev ua kom tawg. Yog li ntawd, cov tub ntxhais ntawm ib hom fiber ntau kuj yog nyias, nrog dav kis tau tus mob, lub peev xwm loj thiab ntev kis nrug. Txawm li cas los xij, vim xav tau cov khoom siv laser hom, tus nqi siab.
Ib hom fiber ntau muaj tib txoj hlua (ob ntu hauv feem ntau cov ntawv thov) ntawm cov iav fiber ntau nrog cov tub ntxhais txoj kab uas hla ntawm 8.3 μ m ~ 10 μ M. Vim tias cov tub ntxhais qhov sib txawv ntawm txoj kab uas hla, ib hom fiber ntau tsuas tuaj yeem xa cov cim teeb liab nrog qhov ntev ntawm 1310nm lossis 1550nm, yog li nws yog qhov nyuaj rau ob peb nrog cov khoom siv kho qhov muag. Kev siv bandwidth ntawm ib hom fiber ntau yog siab tshaj qhov ntawm multimode fiber, tab sis tib lub sij hawm, nws tseem tso rau pem hauv ntej siab dua rau qhov dav spectral thiab kev ruaj ntseg ntawm cov teeb ci: qhov dav dav spectral yuav tsum nqaim, thiab qhov ruaj khov yuav tsum zoo. Vim yog cov kev tawg me me ntawm ib hom fiber ntau, tsuas muaj ib hom kev sib kis, thiaj li muaj peev xwm loj thiab ntev kis tau pom tau.
Rau cov tib hom kho qhov muag, LD lossis LED nrog cov nqaim kab hluav taws xob feem ntau yog siv los ua cov khoom siv lub teeb, thiab cov kab sib txuas ua ke loj tau sib txuam nrog ib hom fiber ntau, uas tuaj yeem ua tiav kev sib kis loj. Ib hom kho qhov muag cov fiber ntau siv dav hauv WDM thiab lwm qhov ntau zaus cov ntaub ntawv xa mus. Multiplexed kho qhov muag teeb tuaj yeem kis tau nrog tsuas yog ib hom fiber ntau.
Ib hom fiber ntau lossis multimode fiber?
Hauv cov ntawv thov kev ruaj ntseg, kev txiav txim siab tshaj plaws ntawm multimode lossis singlemode yog qhov deb. Yog tias nws' s tsuas yog ob peb mais, multimode yog qhov zoo dua. Vim tias coj cov emitters / cov txais khoom muaj ntau pheej yig dua li lasers xav tau rau ib hom. Yog hais tias qhov kev ncua deb ntau dua 5 mais, ib hom fiber ntau yog qhov zoo tshaj plaws. Lwm qhov teeb meem uas yuav tau txiav txim siab yog qhov dav dav. Yog tias cov ntawv thov tom ntej no suav nrog qhov xa ntawm cov kab mob loj cov ntaub ntawv xaib, ces ib hom yuav yog qhov kev xaiv zoo tshaj plaws.
