Unxibelelwano lwe-Optical fiber, njengenye yeentsika eziphambili zonxibelelwano lwangoku, ludlala indima ebalulekileyo kuthungelwano lwezonxibelelwano lwanamhlanje.
Umkhwa wophuhliso wonxibelelwano lwefiber optical unokulindeleka kule miba ilandelayo.
I-1.Ukuze uqonde ukwandisa umthamo wolwazi kunye nokuhanjiswa komgama omde, i-fiber ye-mode eyodwa kunye nelahleko ephantsi kunye ne-dispersion ephantsi kufuneka isetyenziswe.Okwangoku, i-G.652 i-fiber ye-optical ye-mode ye-single-mode isetyenziswa ngokubanzi kwi-line network optical cable lines.Nangona le fiber inelahleko encinci ye-1.55 μm, inexabiso elikhulu lokusasazeka malunga ne-18 ps / (nm.km).Kuthiwa xa i-fiber ye-mode eyodwa eqhelekileyo isetyenziswe kwi-wavelength ye-1.55 μm, ukusebenza kokuhanjiswa akufanelekile.
Ukuba i-zero-dispersion wavelength itshintshile ukusuka kwi-1.31 μm ukuya kwi-1.55 μm, ibizwa ngokuba yi-dispersion-shifted fiber (DSF), kodwa xa le fiber kunye ne-erbium-doped fiber amplifier (EDFA) isetyenziswe kwi-wavelength division multiplexing system (WDM) , iya kuba Ngenxa yokungahambelani kwefiber, ukuxuba amaza amane kwenzeka, okuthintela ukusetyenziswa okuqhelekileyo kwe-WDM, oku kuthetha ukuba i-zero fiber dispersion ayilungile kwi-WDM.
Ukuze iteknoloji yonxibelelwano ye-fiber optical isetyenziswe ngempumelelo kwinkqubo ye-WDM, ukusabalalisa i-fiber kufuneka kuncitshiswe, kodwa akuvumelekanga ukuba ibe zero.Ngoko ke, i-fiber entsha yemodi enye ebizwa ngokuba yi-non-zero dispersion fiber (NZDF), ephuma kwi-1.54 ~ Ixabiso lokusabalalisa kwi-1.56μm uluhlu lunokugcinwa kwi-1.0 ~ 4.0ps / (nm.km), egwemayo. indawo yosasazo enguziro, kodwa igcina ixabiso elincinci losasazo.
Imizekelo emininzi ixeliwe esidlangalaleni kusetyenziswa inkqubo yosasazo ye-NZDF ye-EDFA/WDM.
Izixhobo ze-2.Photonic ezisetyenziswe kwiinkqubo zonxibelelwano ze-fiber optical nazo ziphuhliswe kakhulu kwiminyaka yamuva.Ukuze kuhlangatyezwane neemfuno zeenkqubo ze-WDM, izixhobo zokukhanya ze-multi-wavelength light (MLS) ziye zaphuhliswa kwiminyaka yamuva.Ilungiselela ubukhulu becala iityhubhu zelaser ezininzi kuluhlu kwaye yenza i-hybrid edibeneyo ye-optical component kunye ne-coupler star.
Ukufumana isiphelo senkqubo yonxibelelwano lwefiber optical, i-photodetector yayo kunye ne-preamplifier ziphuhliswa ikakhulu kwicala le-high-speed okanye i-wide-band response.Iifotodiode ze-PIN zinokuhlangabezana neemfuno emva kokuphuculwa.Kwii-photodetectors ze-broadband ezisetyenziswe kwi-band-long-wavelength 1.55μm, i-metal semiconductor-metal photodetection tube (MSM) iye yaphuhliswa kwiminyaka yamuva.Amaza ahambahambayo asasazwa i-photodetector.Ngokweengxelo, le MSM inokubona i-78dB ye-3dB i-frequency bandwidth ye-1.55μm yamaza okukhanya.
I-FET's preamplifier kusenokwenzeka ukuba ithatyathelwe indawo yi-electron mobility transistor (HEMT).Kuxelwa ukuba i-1.55μm i-optoelectronic receiver isebenzisa i-MSM detector kunye ne-HEMT inkqubo yokuhlanganiswa kwangaphambili kwe-optoelectronic (OEIC) ine-frequency band ye-38GHz kwaye kulindeleke ukuba ifike kwi-60GHz.
3. Inkqubo ye-PDH ye-point-to-point transmission system kwi-optical fiber communication system ayikwazanga ukulungelelanisa nophuhliso lweenethiwekhi ze-telecommunications zanamhlanje.Ke ngoko, uphuhliso lonxibelelwano lwefiber optical ngokubhekiselele kuthungelwano lube yinto engenakuthintelwa.
I-SDH ngumgaqo-siseko wothungelwano omtsha kraca oneempawu ezisisiseko zothungelwano.Inethiwekhi yolwazi olubanzi oludibanisa i-multiplexing, ukuhanjiswa komgca kunye nokutshintsha imisebenzi kwaye inamandla okulawula inethiwekhi.Ngoku isetyenziswa ngokubanzi.