Isixhumi se-Fiber optic

1. Imodi yokudlulisa

Kubhekiselwa kumodi yokudlulisa ukukhanya kumafiber optical (ifomu lokusabalalisa insimu kagesi).I-fiber yokuxhumana evame ukusetshenziswa

amamodi ahlukaniswe abe yimodi eyodwa kanye ne-multimode, enemodi eyodwa elungele ukudluliswa kwebanga elide kanye ne-multimode efanelekile

ukudluliswa kwebanga elifushane.I-G652D imicu ye-optical mode eyodwa inobubanzi obuyingqikithi u-d1 obungu-9 um kanye nobubanzi bokuvala u-d2 obungu-125 um.I-Multimode

imicu optical ngokuvamile ihlukaniswe yaba izinhlobo ezimbili: 62.5/125 noma 50/125.

Ukukhethwa kwemodi ye-fiber optical kufanele kufane nemojuli yokubona, ngaphandle kwalokho kuzodala ukulahlekelwa okwengeziwe ngenxa yokungafani kobubanzi obuyinhloko.

Ukuxhumana phakathi kwamafiber optical kanye nezintambo ezinobubanzi obuhlukene bomgogodla akunconywa.

2. Ukulahlekelwa kokufaka

Inani lokunciphisa amandla esignali yokubona, ngokuvamile evezwa ngama-decibel, lapho kusetshenziswa izixhumi ze-fiber optic ekuxhumekeni.Ngokwesibonelo,

uma ukulahlekelwa kokufaka kungu-3dB, ukulahleka kwamandla okusebenza cishe ku-50%.Uma ukulahlekelwa kokufaka kungu-1dB, ukulahleka kwamandla cishe

20%, kanye ne-IL=- 10lg (amandla okusebenza okukhiphayo/amandla okubona okokufaka).

3. Buyisela ukulahlekelwa

Okwaziwa nangokuthi ukulahlekelwa kokubona, kubhekisela kupharamitha yokusebenza kokuboniswa kwesignali.Ukulahleka kwe-Echo kuchaza inani elibuyiswe yi-

isignali yokubona lapho ibuyela endleleni yokuqala.Ngokuvamile, inani elikhulu, lingcono.Isibonelo, uma ufaka amandla angu-1mw, i-10% yawo

kuboniswe emuva, okungu-10dB, futhi u-0.003% uboniswa emuva, okuholela ekulahlekeni kwe-echo cishe okungama-45dB.RL=- 10lg (amandla okukhanya abonisiwe/

amandla okukhanya okokufaka)

4. Uhlobo lobuso

Izinhlobo ze-Optical fibre surface zihlukaniswe nge-PC (i-spherical surface grinding) ne-APC (i-oblique spherical surface grinding).Ngemuva kokugaya i-APC,

i-beam yokukhanya ebonisiwe ebuyela endleleni yasekuqaleni inciphe kakhulu, okusiza ukuthuthukisa ukulahleka kokubuyisela kwesixhumi