Qhov kev ncua deb ntawm cov khoom siv kho qhov muag raug txwv los ntawm kev sib xyaw ua ke ntawm cov yam ntxwv ntawm lub cev thiab kev tsim kho, uas ua ke txiav txim siab qhov deb siab tshaj plaws uas cov teeb liab kho qhov muag tuaj yeem xa tau zoo los ntawm cov fiber kho qhov muag. Tsab xov xwm no piav qhia txog ntau yam uas cuam tshuam feem ntau.
Ua ntej, qhovhom thiab qhov zoo ntawm lub teeb pom kev zooua lub luag haujlwm txiav txim siab. Cov ntawv thov luv luv feem ntau siv cov nqi qis duaLEDs los yog VCSEL lasers, thaum cov kis tau nruab nrab thiab ntev ntev vam khom kev ua tau zoo duaDFB los yog EML lasersLub zog tso zis, qhov dav ntawm spectral, thiab qhov ruaj khov ntawm qhov ntev ntawm lub teeb ncaj qha cuam tshuam rau lub peev xwm kis tau.
Qhov thib ob,kev txo qis ntawm cov fiberyog ib qho ntawm cov yam tseem ceeb uas txwv tsis pub kis tau deb. Raws li cov teeb liab kho qhov muag kis tau los ntawm fiber, lawv maj mam qaug zog vim yog kev nqus cov khoom, Rayleigh scattering, thiab kev poob khoov. Rau ib hom fiber, kev txo qis feem ntau yog li0.5 dB/km ntawm 1310 nmthiab tuaj yeem qis li0.2–0.3 dB/km ntawm 1550 nmNyob rau hauv kev sib piv, multimode fiber qhia ntau dua attenuation ntawm3–4 dB/km ntawm 850 nm, yog vim li cas multimode systems feem ntau tsuas yog txwv rau kev sib txuas lus luv luv xws li ntau pua meters txog li 2 km.
Tsis tas li ntawd,cov teebmeem ntawm kev tawgtxwv tsis pub qhov kev sib kis ntawm cov teeb liab optical ceev heev. Kev tawg - suav nrog cov khoom tawg thiab kev tawg ntawm waveguide - ua rau cov teeb liab optical dav dua thaum lub sijhawm sib kis, ua rau muaj kev cuam tshuam ntawm cov cim. Qhov cuam tshuam no ua rau hnyav heev ntawm cov nqi ntaub ntawv ntawm10 Gbps thiab siab duaTxhawm rau txo qhov kev tawg, cov txheej txheem ntev feem ntau sivCov fiber ntau dispersion-compensating (DCF)los yog sivlasers narrow-linewidth ua ke nrog cov qauv modulation siab heev.
Tib lub sijhawm, lubwavelength ua haujlwmntawm lub optical module muaj feem cuam tshuam nrog qhov kev sib kis.850 nm bandfeem ntau yog siv rau kev sib kis luv luv hla multimode fiber.1310 nm band, sib raug rau lub qhov rais xoom-dispersion ntawm ib hom fiber, yog tsim rau cov ntawv thov nruab nrab-nrug ntawm10–40 km. Lub1550 nm bandmuaj qhov attenuation qis tshaj plaws thiab sib xws nrogCov amplifiers fiber erbium-doped (EDFAs), ua rau nws siv dav rau kev sib kis mus ntev thiab ultra-long-haul dhau ntawm40 km, xws li80 km los yog txawm tias 120 kmcov kev sib txuas.
Qhov ceev ntawm kev xa xov nws tus kheej kuj ua rau muaj kev txwv tsis pub mus deb. Cov ntaub ntawv ceev dua yuav tsum tau muaj qhov sib piv ntawm lub teeb liab thiab suab nrov ntawm lub receiver, ua rau qhov rhiab heev ntawm lub receiver tsawg dua thiab luv dua qhov ncav cuag siab tshaj plaws. Piv txwv li, lub optical module uas txhawb nqa40 km ntawm 1 Gbpstej zaum yuav raug txwv rautsawg dua 10 km ntawm 100 Gbps.
Tsis tas li ntawd xwb,tej yam ib puag ncig—xws li qhov kub thiab txias hloov pauv, kev khoov fiber ntau dhau, kev sib txuas ua qias tuaj, thiab kev laus ntawm cov khoom — tuaj yeem ua rau muaj kev poob ntxiv lossis kev cuam tshuam, ua rau txo qhov kev sib kis tau zoo. Nws kuj tsim nyog sau tseg tias kev sib txuas lus fiber-optic tsis yog ib txwm "luv dua, zoo dua." Feem ntau muaj ib qhoqhov yuav tsum tau muaj qhov deb tsawg kawg nkaus(piv txwv li, cov modules ib hom feem ntau xav tau ≥2 meters) kom tiv thaiv kev cuam tshuam ntau dhau, uas tuaj yeem ua rau lub laser tsis ruaj khov.
Lub sijhawm tshaj tawm: Lub Ib Hlis-29-2026