1. Multimode fiber
Ha boholo ba jiometri ea faeba (haholo-holo bophara ba mantlha d1) bo le boholo ho feta bolelele ba maqhubu a khanya (hoo e ka bang 1 µm), ho tla ba le mekhoa e mengata kapa makholo ea ho ata ka har'a fiber. Mekhoa e fapaneng ea ho hasana e na le lebelo le mekhahlelo e fapaneng ea ho hasana, e bakang ho lieha ha nako le ho atolosoa ha maqhubu a optical ka mor'a phetiso ea nako e telele. Ketsahalo ena e bitsoa modal dispersion (eo hape e tsejoang e le intermodal dispersion) eafiber ea optical.
Phatlalatso ea Modal e tla fokotsa bandwidth ea fiber ea multimode le ho fokotsa matla a eona a phetisetso, kahoo fiber ea multimode e loketse likhokahano tse nyane tsa fiber optic.
Kabo ea index ea refractive ea fiber ea multimode haholo-holo ke kabo ea parabolic, ke hore, kabo ea index ea refractive e hlophisitsoeng. Bophara ba mokokotlo oa eona ke hoo e ka bang 50 µm.
2. Fiber ea mode e le 'ngoe
Ha boholo ba geometric ba fiber (haholo-holo bophara ba mantlha) bo ka ba haufi le bolelele ba maqhubu a khanya, mohlala, bophara ba d1 bo bohareng ba 5-10 µm, fiber e lumella mokhoa o le mong feela (mokhoa oa motheo HE11) ho hasana ho eona, 'me mefuta e meng ea maemo a holimo e khaotsoe, likhoele tse joalo li bitsoa likhoele tsa mofuta o le mong.
Kaha e na le mokhoa o le mong oa ho hasana 'me e qoba bothata ba ho hasana ha mokhoa, fiber ea mofuta o le mong e na le bandwidth e pharaletseng haholo' me e loketse ka ho khetheha bakeng sa puisano e phahameng ea fiber optic. Ka hona, ho finyella phetisetso ea mokhoa o le mong, litekanyetso tsa fiber li tlameha ho finyella maemo a itseng E baloa ka mokhoa oa hore fiber e nang le NA = 0.12 e fihlelle phetiso ea mokhoa o le mong ka holimo ho λ=1.3 µm, Radius ea fiber core e tlameha ho ba teng. e be ≤4.2 µm, ke hore, bophara ba eona ba mantlha d1≤8.4 µm.
Kaha bophara ba mantlha ba fiber ea mofuta o le mong bo nyane haholo, ho behiloe litlhoko tse thata ts'ebetsong ea eona ea tlhahiso.
Nako ea poso: Jan-10-2023
