25G SR SFP28

Lub npe hu ua "hom" yog hais txog lub teeb ntawm lub teeb nkag mus rau hauv qhov muag fiber ntau ntawm ib qho kev nrawm nrawm.

Multimode fiber ntau tso cai rau ntau lub teeb ntawm lub teeb kom nthuav tawm hauv cov fiber ntau tib lub sijhawm, yog li tsim hom dispersion (vim txhua "hom" lub teeb nkag mus rau fiber ntau ntawm lub kaum sab xis sib txawv thiab lawv tuaj txog ntawm lwm qhov kawg taw tes ntawm lub sijhawm sib txawv, qhov no feature. yog hu ua hom dispersion.), hom dispersion tshuab txwv lub bandwidth thiab nrug ntawm multimode optical fibers. Yog li ntawd, multimode optical fibers muaj cov tub ntxhais cov xov hlau tuab, tsis tshua muaj kev sib kis ceev, luv luv, thiab kev ua haujlwm tsis zoo ntawm kev sib kis. Txawm li cas los xij, lawv cov nqi kuj tsawg thiab lawv feem ntau siv hauv cov tsev lossis thaj chaw. nyob rau hauv qhov chaw nyob ib sab.

Ib hom optical fiber tsuas tuaj yeem tso cai rau ib lub teeb ntawm lub teeb kom nthuav tawm, yog li ib hom kho qhov muag fiber ntau tsis muaj cov yam ntxwv dispersion. Yog li ntawd, cov tub ntxhais ntawm ib hom kev kho qhov muag fiber ntau yog sib luag thinner. Nws muaj qhov sib kis tau dav dav, muaj peev xwm loj, thiab qhov sib kis tau ntev. Txawm li cas los xij, vim nws yuav tsum tau siv lub tshuab laser, tus nqi siab dua.

Ib hom fiber ntau tsuas muaj ib qho strand (ob strands hauv feem ntau daim ntawv thov) ntawm iav fiber ntau nrog ib txoj kab uas hla ntawm 8.3μm ~ 10μm. Vim yog qhov tseem ceeb ntawm txoj kab uas hla, ib hom kho qhov muag fiber ntau tuaj yeem xa cov teeb liab kho qhov muag nrog lub wavelength ntawm 1310nm lossis 1550nm, ua rau kev sib txuas nrog cov khoom siv kho qhov muag kuj nyuaj. Lub bandwidth ntawm ib hom fiber ntau yog siab dua li ntawm ntau hom fiber ntau, tab sis tib lub sijhawm, qhov no kuj tso siab rau cov kev xav tau siab dua rau qhov dav dav thiab ruaj khov ntawm lub teeb ci: uas yog, qhov dav spectral yuav tsum nqaim thiab kev ruaj ntseg yuav tsum zoo dua.

Rau ib hom optical modules, LD lossis LED nrog cov kab nqaim spectral feem ntau yog siv los ua lub teeb ci. Qhov loj ntawm cov khoom sib txuas yog txuam nrog ib hom kev kho qhov muag fiber ntau kom ua tiav kev sib kis ceev.

Piv nrog rau ntau hom optical fiber ntau, cov tub ntxhais txoj kab uas hla ntawm ib hom optical fiber ntau me dua. Cov yam ntxwv ntawm me me txoj kab uas hla thiab ib leeg-hom kis tau tus mob xyuas kom meej tias lub optical teeb liab kis tau tus mob nyob rau hauv ib hom optical fiber yuav tsis raug distorted los ntawm kev sib tshooj ntawm optical pulses. Ntawm txhua hom fiber ntau, ib hom fiber ntau muaj qhov qis tshaj qhov teeb liab attenuation tus nqi thiab qhov siab tshaj plaws kis tau tus mob ceev.

Multimode fiber ntau yog lwm hom fiber ntau nrog ib txoj kab uas hla ntawm 50μm ~ 100μm thiab kev ua haujlwm wavelength ntawm 850nm lossis 1310nm. Nws yog ib qho yooj yim los ua ke nrog cov khoom siv kho qhov muag. Nws tuaj yeem xa mus rau ntau hom ntawm kev ua haujlwm wavelength.

Piv nrog cov twisted khub, multimode optical fiber tuaj yeem txhawb nqa kev sib kis ntev dua. Hauv 10mbps thiab 100mbps Ethernet, multimode optical fiber tuaj yeem txhawb nqa qhov kev sib kis ntau tshaj plaws ntawm 2,000 meters. Cov tub ntxhais txoj kab uas hla ntawm ntau hom multimode optical fibers yog 50μm, 62.5μm thiab 100μm.

Txij li thaum muaj ntau pua hom kis tau tus mob nyob rau hauv multimode optical fiber, propagation tsis tu ncua thiab pab pawg neeg cov nqi ntawm txhua hom yog txawv, uas ua rau cov fiber bandwidth nqaim, dispersion loj, thiab poob loj, uas txwv qhov zaus ntawm cov teeb liab kis tau tus mob, yog li nws yog. tsuas yog haum rau Rau luv-rau nruab nrab-nruab deb, me me-muaj peev xwm kho qhov muag fiber kev sib txuas lus systems, feem ntau lawv tsuas kis tau ob peb kilometers.

1. Tib hom optical fiber txhawb ib leeg-fiber transceiver. Nws qhov kev siv yog tias ib kawg siv lub wavelength ntawm 1500 mus rau kis thiab lub wavelength ntawm 1300 tau txais, thaum lwm qhov kawg yog qhov txawv. Ib kawg siv lub wavelength ntawm 1500 kom tau txais thiab lub wavelength ntawm 1300 xa mus. Qee tus neeg hu qhov no duplex. Qhov tseeb, nws tsis yog qhov tseeb los hais qhov no. Nws yuav tsum raug hu ua rov siv dua. Multimode optical fiber tsuas yog txhawb nqa dual-fiber transceiver. Txij li thaum multimode siv refraction xa mus, ob lub wavelengths tsis tuaj yeem kis tau rau hauv cov lus qhia sib txawv ntawm fiber ntau optical. Tsuas yog ib lub wavelength tuaj yeem siv tau, thiab nws tsis tuaj yeem ua ntau yam.

2. Cov tub ntxhais txoj kab uas hla ntawm ib hom fiber ntau yog me me (txog 10mm), tsuas yog tso cai rau ib hom kev sib kis, muaj me me dispersion, ua haujlwm ntawm qhov ntev wavelengths (1310nm thiab 1550nm), thiab yog ib qho nyuaj rau ob peb nrog cov khoom siv kho qhov muag; cov tub ntxhais txoj kab uas hla ntawm ntau hom fiber ntau yog loj (62.5mm lossis 50mm), tso cai rau ntau pua hom kev sib kis, loj dispersion, thiab ua haujlwm ntawm 850nm lossis 1310nm. Coupling rau cov khoom siv kho qhov muag yog qhov yooj yim.

3. Lub logo ntau hom yog "MMF", thiab lub logo ib hom yog "SMF"; Yog tias koj ntxig nws rau hauv lub cuab yeej thiab saib sab hauv, yog tias muaj lub teeb, nws txhais tau tias ntau hom, thiab yog tias tsis muaj lub teeb, nws txhais tau tias ib hom (lub hauv paus ntsiab lus yog hom ib leeg siv Laser yog siv los ua lub teeb. qhov chaw, thaum ntau hom siv lub teeb-emitting diodes raws li lub teeb ci)

Hauv daim ntawv thov kev ruaj ntseg, qhov kev txiav txim siab tshaj plaws hauv kev xaiv multimode lossis singlemode yog nyob deb. Yog tias tsuas muaj ob peb mais, multimode nyiam dua. Vim tias LED transmitter / receivers yog pheej yig dua li lub laser xav tau rau ib hom. Yog tias qhov kev ncua deb ntau dua 5 mais, ib hom fiber ntau yog qhov zoo tshaj. Lwm qhov teeb meem los xav txog yog broadband. Yog tias cov ntawv thov yav tom ntej yuav suav nrog kev xa cov ntaub ntawv loj-bandwidth, ces ib hom yuav yog qhov kev xaiv zoo tshaj plaws.