Muaj 5 qib ntawm multimode fiber: OM1, OM2, OM3, OM4, thiab tam sim no OM5. Dab tsi ua rau lawv txawv?
Ntawm lub hauv paus (zam txim rau qhov pun), qhov sib cais cov qib fiber no yog lawv qhov loj me, cov transmitters, thiab cov peev xwm bandwidth.
Cov fibers multimode (OM) muaj lub hauv paus ntawm 50 µm (OM2-OM5) lossis 62.5 µm (OM1). Lub hauv paus loj dua txhais tau tias ntau hom teeb ci mus ncig lub hauv paus tib lub sijhawm, yog li lub npe "multimode."
Cov Khoom Siv Qub Qub
Qhov tseem ceeb, OM1 qhov loj 62.5 µm txhais tau tias nws tsis sib xws nrog lwm qib ntawm multimode thiab tsis tuaj yeem lees txais tib lub connectors. Txij li thaum OM1 thiab OM2 ob leeg tuaj yeem muaj cov tsho sab nraud txiv kab ntxwv (raws li TIA / EIA tus qauv), ib txwm xyuas cov lus piav qhia luam tawm ntawm lub cable kom ntseeg tau tias koj siv cov connectors raug.
Cov fibers thaum ntxov OM1 thiab OM2 ob leeg tau tsim los siv nrog LED qhov chaw lossis transmitters. Cov kev txwv modulation ntawm LEDs kuj txwv cov peev xwm ntawm OM1 thiab OM2 thaum ntxov.
Txawm li cas los xij, qhov kev xav tau ntawm qhov ceev nce ntxiv txhais tau tias cov fibers optical xav tau cov peev xwm bandwidth siab dua. Nkag mus rau laser-optimized multimode fibers (LOMMF): OM2, OM3 thiab OM4, thiab tam sim no OM5.
Kev Txhim Kho Laser
Cov fibers OM2, OM3, OM4, thiab OM5 yog tsim los ua haujlwm nrog cov lasers ntsug-cavity surface-emitting lasers (VCSELs), feem ntau ntawm 850 nm. Niaj hnub no, laser-optimized OM2 (xws li peb li) kuj muaj nyob rau hauv. VCSELs tso cai rau cov nqi modulation sai dua li LEDs, txhais tau tias laser-optimized fibers tuaj yeem xa cov ntaub ntawv ntau dua.
Raws li cov qauv kev lag luam, OM3 muaj qhov modal bandwidth (EMB) zoo ntawm 2000 MHz * km ntawm 850 nm. OM4 tuaj yeem ua haujlwm 4700 MHz * km.
Hais txog kev txheeb xyuas, OM2 tswj lub tsho txiv kab ntxwv, raws li tau hais los saum toj no. OM3 thiab OM4 ob leeg tuaj yeem muaj lub tsho sab nraud aqua (qhov no yog qhov tseeb ntawm Cleerline OM3 thiab OM4 patch cables). OM4 tuaj yeem tshwm sim nrog lub tsho sab nraud "Erika violet". Yog tias koj khiav mus rau hauv lub xov tooj fiber optic ci magenta, nws yuav yog OM4. Zoo siab, OM2, OM3, OM4, thiab OM5 yog txhua yam 50/125 µm fibers thiab tuaj yeem lees txais tib lub connectors. Nco ntsoov, txawm li cas los xij, tias cov lej xim connector sib txawv. Qee lub connectors multimode yuav raug cim tias "optimized rau OM3 / OM4 fiber" thiab yuav muaj xim aqua. Tus qauv laser-optimized multimode connectors tuaj yeem yog beige lossis dub. Yog tias muaj kev tsis meej pem, thov xyuas cov lus qhia connector tshwj xeeb hauv kev hais txog qhov loj me ntawm lub hauv paus. Kev sib phim qhov loj me ntawm lub hauv paus yog qhov tseem ceeb tshaj plaws rau cov khoom siv kho tshuab, vim nws ua kom ntseeg tau tias lub teeb liab yuav tswj kev sib txuas lus los ntawm lub connector.
Lub sijhawm tshaj tawm: Lub Yim Hli-01-2022