1. Faibha yemhando dzakasiyana-siyana
Kana saizi yejometri yefaibha (kunyanya dhayamita yepakati d1) yakakura kupfuura wavelength yechiedza (inenge 1 µm), pachava nematanho akawanda kana kunyange mazana enzira dzekupararira mufaibha. Nzira dzakasiyana dzekupararira dzine kumhanya kwakasiyana kwekupararira uye zvikamu, zvichikonzera kunonoka kwenguva uye kuwedzera kwemagetsi emagetsi mushure mekutumirwa kure. Chiitiko ichi chinonzi modal dispersion (inozivikanwawo se intermodal dispersion). fiber optics.
Kupararira kwemodal kuchaderedza bandwidth ye multimode fiber uye kunoderedza kugona kwayo kutumira, saka multimode fiber yakakodzera chete kune kutaurirana kwe fiber optic ine simba diki.
Kugoverwa kwe multimode fiber ne refractive index kunonyanya kuve parabolic, zvichireva kuti ine graded refractive index. Core dhayamita yayo inenge 50 µm.
2. Faibha yemhando imwe chete
Kana saizi ye geometric ye fiber (kunyanya dhayamita yepakati) ichigona kuva pedyo newavelength yechiedza, semuenzaniso, dhayamita yepakati d1 iri pakati pe5-10 µm, fiber inongobvumira mode imwe chete (fundamental mode HE11) kuti ipararire mairi, uye mamwe ma modes epamusoro anogurwa; fiber dzakadaro dzinonzi single-mode fibers.
Sezvo iine nzira imwe chete yekupararira uye ichidzivirira dambudziko rekupararira kwemode, fiber yemode imwe chete ine bandwidth yakakura kwazvo uye inonyanya kukodzera kutaurirana kwefiber optic ine simba rakawanda. Saka, kuti iwane single-mode transmission, ma parameter efiber anofanirwa kusangana nemamiriro ezvinhu akati wandei. Inoverengerwa uchishandisa fomula yekuti kune fiber ine NA=0.12, kuti iwane single-mode transmission iri pamusoro pe λ=1.3 µm, radius ye fiber core inofanira kunge iri ≤4.2 µm, kureva kuti, dhayamita yayo yepakati d1≤8.4 µm.
Sezvo dhayamita yepakati ye single-mode optical fiber iri diki kwazvo, zvinodiwa zvakanyanya zvinoiswa pakugadzirwa kwayo.
Nguva yekutumira: Ndira-10-2023
