Muaj 5 qib ntawm multimode fiber ntau: OM1, OM2, OM3, OM4, thiab tam sim no OM5. Dab tsi ua rau lawv txawv?
Ntawm qhov tseem ceeb ( zam txim rau lub pun ), dab tsi cais cov qib fiber ntau yog lawv qhov loj me, transmitters, thiab bandwidth peev xwm.
Optical multimode (OM) fibers muaj cov tub ntxhais ntawm 50 µm (OM2-OM5) lossis 62.5 µm (OM1). Cov tub ntxhais loj dua txhais tau tias ntau hom ntawm lub teeb mus rau hauv cov tub ntxhais tib lub sijhawm, yog li lub npe "multimode."
Txoj Cai Fibers
Qhov tseem ceeb, OM1's 62.5 µm core loj txhais tau hais tias nws tsis sib xws nrog lwm qib ntawm multimode thiab tsis tuaj yeem lees txais tib cov khoom sib txuas. Txij li thaum OM1 thiab OM2 ob leeg tuaj yeem muaj cov txiv kab ntxwv lub tsho sab nrauv (raws li TIA / EIA cov qauv), nco ntsoov xyuas cov ntawv sau rau ntawm lub cable kom paub tseeb tias koj siv cov khoom sib txuas kom raug.
Thaum ntxov OM1 thiab OM2 fibers yog ob qho tib si tsim los siv nrog LED qhov chaw lossis transmitters. Cov kev txwv kev hloov pauv ntawm LEDs kuj tseem txwv cov peev txheej ntawm OM1 thiab OM2 thaum ntxov.
Txawm li cas los xij, qhov xav tau ntau ntxiv rau kev ceev txhais tau hais tias optical fibers xav tau ntau dua bandwidth peev xwm. Nkag mus rau laser-optimized multimode fibers (LOMMF): OM2, OM3 thiab OM4, thiab tam sim no OM5.
Laser-Optimization
OM2, OM3, OM4, thiab OM5 fibers yog tsim los ua haujlwm nrog ntsug-cavity nto-emitting lasers (VCSELs), feem ntau ntawm 850 nm. Niaj hnub no, laser-optimized OM2 (xws li peb li) kuj tau yooj yim. VCSELs tso cai rau kev hloov pauv sai dua li LEDs, txhais tau hais tias laser-optimized fibers tuaj yeem xa cov ntaub ntawv ntau dua.
Raws li cov qauv kev lag luam, OM3 muaj qhov ua tau zoo modal bandwidth (EMB) ntawm 2000 MHz * km ntawm 850 nm. OM4 tuaj yeem ua haujlwm 4700 MHz * km.
Hais txog kev txheeb xyuas, OM2 tuav lub tsho txiv kab ntxwv, raws li tau sau tseg saum toj no. OM3 thiab OM4 ob leeg tuaj yeem muaj lub tsho aqua sab nrauv (qhov no yog qhov tseeb ntawm Cleerline OM3 thiab OM4 thaj cables). OM4 tuaj yeem hloov pauv nrog lub tsho "Erika violet" sab nrauv. Yog tias koj khiav mus rau hauv lub ci magenta fiber optic cable, nws yog OM4. Zoo siab heev, OM2, OM3, OM4, thiab OM5 yog tag nrho 50/125 µm fibers thiab txhua tus tuaj yeem txais tib cov khoom sib txuas. Nco ntsoov, txawm li cas los xij, cov kab sib txuas xim sib txawv. Qee cov khoom sib txuas sib txuas yuav raug cim tias "zoo rau OM3 / OM4 fiber ntau" thiab yuav muaj xim aqua. Standard laser-optimized multimode connectors yuav beige los yog dub. Yog tias muaj kev tsis sib haum xeeb, thov xyuas qhov txuas txuas tshwj xeeb hauv kev hais txog qhov loj me. Kev sib txuam ntawm cov tub ntxhais loj yog qhov tseem ceeb tshaj plaws rau cov khoom siv sib txuas, vim nws ua kom ntseeg tau tias lub teeb liab yuav tswj tau txuas ntxiv los ntawm qhov txuas.
Post lub sij hawm: Aug-01-2022