Kunezinhlobo ezi-5 ze-fiber ye-multimode: i-OM1, i-OM2, i-OM3, i-OM4, manje i-OM5. Yini ngempela ebenza bahluke?
Emongweni (ngiyaxolisa nge-pun), okuhlukanisa lawa ma-fiber grades ubukhulu bawo obuyinhloko, ama-transmitter, kanye namakhono e-bandwidth.
Imicu ye-optical multimode (OM) ine-core engu-50 µm (OM2-OM5) noma engu-62.5 µm (OM1). I-core enkulu isho ukuthi izindlela eziningi zokukhanya zihamba phansi kwe-core ngesikhathi esisodwa, yingakho igama elithi “multimode.”
Ama-Fibers Efa
Okubalulekile, usayizi we-OM1 ongu-62.5 µm oyinhloko usho ukuthi awuhambisani nezinye izinhlobo ze-multimode futhi awukwazi ukwamukela izixhumi ezifanayo. Njengoba i-OM1 ne-OM2 zombili zingaba namajakethi angaphandle anombala ophuzi (ngokwezindinganiso ze-TIA/EIA), hlola njalo inganekwane yokuphrinta kukhebula ukuqinisekisa ukuthi usebenzisa izixhumi ezifanele.
Imicu yokuqala ye-OM1 kanye ne-OM2 yaklanywa ukuthi isetshenziswe nemithombo ye-LED noma ama-transmitter. Ukulinganiselwa kokuguquguquka kwama-LED nakho kunciphise amandla e-OM1 kanye ne-OM2 yokuqala.
Kodwa-ke, isidingo esikhulayo sesivinini sasho ukuthi imicu ye-optical yayidinga amakhono aphezulu e-bandwidth. Faka imicu ye-multimode elungiselelwe nge-laser (LOMMF): OM2, OM3 kanye ne-OM4, manje sekuyi-OM5.
Ukuthuthukiswa Kwe-Laser
Imicu ye-OM2, OM3, OM4, kanye ne-OM5 iklanyelwe ukusebenza nama-laser akhipha ubuso aqondile (ama-VCSEL), ngokuvamile angama-850 nm. Namuhla, i-OM2 eyenziwe nge-laser (njengeyethu) nayo iyatholakala kalula. Ama-VCSEL avumela amazinga okuguquguquka okusheshayo kakhulu kunama-LED, okusho ukuthi imicu eyenziwe nge-laser ingadlulisela idatha eningi kakhulu.
Ngokwezindinganiso zomkhakha, i-OM3 ine-bandwidth ye-modal esebenzayo (EMB) engu-2000 MHz*km ku-850 nm. I-OM4 ingaphatha i-4700 MHz*km.
Ngokuphathelene nokuhlonza, i-OM2 igcina ijakethi eliwolintshi, njengoba kuphawuliwe ngenhla. I-OM3 ne-OM4 zombili zingaba nejakethi yangaphandle ye-aqua (lokhu kuyiqiniso ngezintambo ze-Cleerline OM3 kanye ne-OM4 patch). I-OM4 ingavela ngenye indlela nejakethi yangaphandle ye-"Erika violet". Uma uhlangana nekhebula le-fiber optic elikhanyayo elikhanyayo, cishe yi-OM4. Ngokujabulisayo, i-OM2, i-OM3, i-OM4, kanye ne-OM5 zonke ziyizintambo ezingama-50/125 µm futhi zonke zingamukela izixhumi ezifanayo. Nokho, qaphela ukuthi amakhodi ombala wesixhumi ayahlukahluka. Ezinye izixhumi ze-multimode zingase zimakwe ngokuthi "zilungiselelwe i-OM3/OM4 fiber" futhi zizoba nombala we-aqua. Izixhumi ze-multimode ezijwayelekile ezilungiselelwe nge-laser zingaba beige noma zibe mnyama. Uma kukhona ukudideka, sicela uhlole imininingwane yesixhumi ngqo maqondana nosayizi we-core. Ukufanisa usayizi we-core kuyisici esibaluleke kakhulu sezixhumi zemishini, njengoba kuqinisekisa ukuthi isignali izogcina ukuqhubeka ngesixhumi.
Isikhathi sokuthunyelwe: Agasti-01-2022