1. Faeba ea Multimode
Ha boholo ba geometrike ba faeba (haholo-holo bophara ba mantlha d1) bo le boholo ho feta bolelele ba leqhubu la lesedi (hoo e ka bang 1 µm), ho tla ba le mekhoa e mengata kapa esita le makholo ea ho ikatisa faeba. Mekhoa e fapaneng ea ho ikatisa e na le lebelo le mekhahlelo e fapaneng ea ho ikatisa, e leng se fellang ka tieho ea nako le keketseho ea li-pulse tsa optical kamora phetiso ea sebaka se selelele. Ketsahalo ena e bitsoa modal dispersion (e tsejoang hape e le intermodal dispersion). li-fiber optics.
Ho hasana ha modal ho tla fokotsa bandwidth ea fiber ea multimode le ho fokotsa bokhoni ba eona ba phetisetso, kahoo fiber ea multimode e loketse feela puisano ea fiber optic ea bokhoni bo bonyenyane.
Kabo ea index ea refractive ea faeba ea multimode haholo-holo ke ea parabolic, ho bolelang hore e na le index ea refractive e hlophisitsoeng ka lihlopha. Bophara ba eona ba mantlha ke hoo e ka bang 50 µm.
2. Faeba ea mokhoa o le mong
Ha boholo ba geometrike ba faeba (haholo-holo bophara ba mantlha) bo ka ba haufi le bolelele ba leqhubu la lesedi, mohlala, bophara ba mantlha d1 bo pakeng tsa 5-10 µm, faeba e dumella mokgwa o le mong feela (mokgwa wa motheo HE11) ho ata ho yona, mme mekgwa e meng e meng e hodimo e a kgaolwa; difaeba tse jwalo di bitswa difaeba tsa mokgwa o le mong.
Kaha e na le mokhoa o le mong feela oa ho phatlalatsa 'me e qoba bothata ba ho hasana ha mokhoa, faeba ea mokhoa o le mong e na le bandwidth e pharaletseng haholo 'me e loketse haholo puisano ea fiber optic ea bokhoni bo phahameng. Ka hona, ho fihlella phetiso ea mokhoa o le mong, liparamente tsa faeba li tlameha ho fihlela maemo a itseng. E baloa ho sebelisoa mokhoa oa hore bakeng sa faeba e nang le NA=0.12, ho fihlella phetiso ea mokhoa o le mong ka holimo ho λ=1.3 µm, radius ea mantlha ea faeba e tlameha ho ba ≤4.2 µm, ke hore, bophara ba eona ba mantlha d1≤8.4 µm.
Kaha bophara ba mantlha ba fiber ea optical ea mokhoa o le mong bo nyane haholo, litlhoko tse thata li behiloe ts'ebetsong ea tlhahiso ea eona.
Nako ea poso: Pherekhong-10-2023
