Ib hom fiber ntau (SingleModeFiber) yog ib qho fiber ntau optical uas tuaj yeem kis tau ib hom ntawm ib lub wavelength uas tau teev tseg.Lub hauv paus iav core yog nyias nyias (txoj kab uas hla feem ntau yog 9 lossis 10μm).
Yog li ntawd, nws inter-hom dispersion yog heev me me, haum rau tej thaj chaw deb kev sib txuas lus Txawm li cas los, kuj muaj cov khoom dispersion thiab waveguide dispersion, thiaj li hais tias ib hom fiber ntau yuav tsum siab dua nyob rau hauv spectral dav thiab stability ntawm lub teeb qhov chaw, uas yog, qhov dav spectral yuav tsum nqaim thiab kev ruaj ntseg zoo dua.
Tom qab ntawd, nws tau pom tias ntawm 1.31μm wavelength, cov khoom tawg ntawm ib hom optical fiber ntau thiab cov waveguide dispersion yog qhov zoo thiab qhov tsis zoo, thiab qhov loj me yog tib yam.Nyob rau hauv txoj kev no, thaj tsam 1.31μm wavelength tau dhau los ua lub qhov rais ua haujlwm zoo tshaj plaws rau kev sib txuas lus fiber ntau, thiab tam sim no yog lub luag haujlwm tseem ceeb ntawm kev siv tshuab optical fiber ntau.Cov tsis tseem ceeb ntawm 1.31μm cov pa ib hom fiber ntau tau pom zoo los ntawm International Telecommunication Union ITU-T hauv G652 Qee yam, yog li cov fiber ntau no tseem hu ua G652 fiber.Ib hom fiber ntau tuaj yeem muab faib ua 652 ib hom fiber ntau, 653 ib hom fiber ntau thiab 655 ib hom fiber ntau.
Qhov kev piav qhia ntawm "ib hom fiber ntau" hauv cov ntaub ntawv kawm: feem ntau, thaum v tsawg dua 2.405, tsuas yog ib lub ncov hauv fiber ntau dhau, yog li nws hu ua ib hom fiber ntau.Nws cov tub ntxhais yog nyias nyias, txog 8-10 microns, thiab hom dispersion yog me me heev.Lub ntsiab tseem ceeb uas cuam tshuam qhov dav ntawm fiber ntau kis tau tus mob yog ntau yam dispersion, thiab hom dispersion yog qhov tseem ceeb tshaj plaws.Lub dispersion ntawm ib hom fiber ntau yog me me, yog li nws muaj peev xwm kis tau lub teeb nyob rau hauv ib tug dav zaus band rau ib tug ntev nyob deb.
Ib hom fiber ntau muaj ib txoj kab uas hla ntawm 10 micron, uas tso cai rau ib hom kab sib kis, uas tuaj yeem txo qhov bandwidth thiab Modal Dispersion.Txawm li cas los xij, vim hais tias ib hom fiber ntau cov tub ntxhais txoj kab uas hla me me dhau, nws nyuaj rau tswj cov kab hluav taws xob sib kis, yog li nws yog qhov tsim nyog kom kim lasers siv los ua lub teeb pom kev zoo, thiab qhov kev txwv tseem ceeb ntawm ib hom kho qhov muag cables yog cov khoom tawg. .Tib hom optical cables feem ntau yog siv lasers kom tau txais bandwidth siab.Txij li cov LEDs yuav tso tawm ntau lub teeb pom kev zoo nrog cov bandwidth sib txawv, cov khoom siv dispersion yog qhov tseem ceeb heev.Ib hom fiber ntau tuaj yeem txhawb kev sib kis ntev dua li ntau hom fiber ntau.Hauv 100Mbps Ethernet lossis 1G Gigabit network, ib hom fiber ntau tuaj yeem txhawb nqa kev sib kis ntawm ntau dua 5000m los ntawm tus nqi saib.Los ntawm qhov kev xav ntawm tus nqi, txij li thaum lub optical transceiver yog kim heev, tus nqi ntawm kev siv ib hom optical fiber ntau yuav siab dua tus nqi ntawm ntau hom optical fiber cable.
Lub refractive index faib yog zoo ib yam li lub abrupt optical fiber, cov tub ntxhais txoj kab uas hla yog tsuas yog 8 ~ 10μm, thiab lub teeb propagates nyob rau hauv ib tug linear duab raws lub core axis.Vim tias cov fiber ntau no tsuas yog kis tau ib hom (ob lub xeev polarization yog degenerate), nws yog hu ua ib hom fiber ntau thiab nws cov teeb liab distortion tsawg heev.