Cov Qauv Txheem Thiab Kev Rho Tawm Ntawm Fiber Optic Kev Sib Txuas Lus

Cov qauv yooj yim ntawm cov khoom sib txuas lus fiber ntau ntawm cov kev sib txuas lus fiber ntau: kis, txais tos, thiab kev txais tos optic

(1) Cov ntaub ntawv xa: Cov ntaub ntawv hloov cov neeg siv cov ntaub ntawv rau hauv cov hluav taws xob hluav taws xob (cov paib taw qhia); Cov Hluav Taws Xob Hloov Hluav Taws Xob Hloov Pispand taw qhia rau hauv cov cim ntsuas teeb tsa rau cov kev sib kis cov channel (xws li FM, PFM); Lub qhov muag hloov kho kho kho tshiab thiab hloov cov hluav taws xob rau hauv cov cim kho qhov muag.

(2) Tau Txais Tshooj: Tus tau txais kho qhov muag hloov kho kho qhov muag hloov dua tshiab kis tau los ntawm cov fiber ntau hauv cov paib hluav taws xob; Cov hluav taws xob tau txais cov teeb tsa hluav taws xob rau cov cim hluav taws xob; Cov ntaub ntawv dab dej rov qab cov neeg siv cov ntaub ntawv. Nco tseg: Cov hluav taws xob teeb hluav taws xob ntu ua ntej lub tshuab xa khoom siv kho tshiab siv lub tshuab cable tib yam, tsuas yog hloov kho qhov kev sib txuas lus sib txuas, tsuas yog hloov kho cable no + Kho kho kho kho qhov muag. "

(3) Cov fiber ntau fiber optic xa tawm cov kab ke tau muab faib ua peb ntu: Kab khoos phis tawm, thiab kho qhov muag tau kho qhov muag:

Qhov chaw kho Windows: Cov tub ntxhais yog lub teeb ci (xws li LED, muaj cov teeb meem loj, thiab cov nthwv dej nqaim; Nws muaj nuj nqi yog hloov kho hluav taws xob kos npe rau cov cim kho qhov muag thiab ib khub rau kev kho fiber ntau.

Optical fiber ntau kab: muaj ntawm cov kev siv roj muag siv kho tshiab, cov khoom siv, thiab cov txuas (ua tau siv cov cable optical); Nws txoj haujlwm yog los kis cov cim kho qhov muag uas muaj qis distortion thiab qis attenuation. Kev ntsuas kho qhov muag tau yog cylindrical (tseem ceeb dua kev ntsuas (n_1) Nws muaj 3 {{{- tsis muaj qhov rai: (0.85 \\ mu m) (wavelength), (1.55 \\ mu m) (wavelength); Cov yam ntxwv tseem ceeb yog ploj (chav ntsuas: DB / KM) thiab dispersion (chav (unit: (PS / (Km · NM)), cuam tshuam rau kev kis bandwidth).

Cov ntawv kho qhov muag tau kho qhov muag (xws li Photodetector (Apd Avalanche photodiode), APD Avalanche Phodiode), Apd Avodiode) Qhov tseem ceeb tshaj plaws yog qhov rhiab (xav txog qhov muaj peev xwm tau txais cov cim tsis muaj zog kho qhov muag, qhov taw qhia tseem ceeb ntawm cov kab ke zoo); Nws txoj haujlwm yog hloov kho qhov muag cov cim rau hauv cov cim hluav taws xob thiab rov ua tus thawj lub teeb liab tseem ceeb.

Kev faib tawm cov fiber ntau nws cov kev sib txuas lus sib txuas lus ib yam li hauv qab no:

(1) Kev faib khoom los ntawm cov phiajcim kis tau: muab faib ua cov tshuab hluav taws xob thiab cov tshuab sib txuas lus fiber ntau:

Qhov Zoo ntawm Fiber Optic Digital Kev Sib Txuas Tshuab:

Muaj zog anti - interence muaj peev xwm thiab kis tau zoo kis tau zoo (suab hais tias ua yuam kev thaum dhau qhov pib);

Kev rov ua haujlwm dua rov ua dua, ntev kis nrug deb (tshem tawm cov suab nrov tsub zuj zuj);

Pab kom haum cov kev pabcuam nrog kev hloov pauv tau zoo (yooj yim siv cov kev pabcuam sib xyaw);

Yooj yim rau kev siv siab siab-}}}}}}}} kev sib txuas lus zoo sib xws (pleastext thiab qhov tseem ceeb modulo-2 ntxiv);

Siv cov khoom siv digital, yooj yim los sib sau ua ke, miniaturize, tus nqi tsawg, thiab kev ntseeg siab.

Qhov tsis zoo ntawm fiber ntau optic digital cov khoom sib txuas lus: dav nyob rau hauv bandwidth, qis bandwidth siv, cov cuab yeej tsis muaj txiaj ntsig, thiab tus nqi siab.

Cov yam ntxwv ntawm Fiber ntau qhov kev sib txuas lus Analog, cov kab ke yooj yim (tsis tas yuav / d / d / hloov dua siab tshiab), tus nqi qis, haum} nrug nrug kev sib txuas lus.

(2) Kev sib cais los ntawm kev ntsuas kev kho mob thiab muaj fiber ntau: muab faib ua cov khoom sib txuas lus luv luv optic kev sib txuas lus fiber ntau optic kev sib txuas lus systems:

Luv wavelength multimode tshuab: khiav nthwv wavelength ncig (0.85 \\ tus nqi tsawg dua lossis sib npaug lossis sib npaug ntawm 10km.

Ntev wavelength tshuab (subdivided ua 3 pawg):

(1.31 \\ mu m) multimode system: tus nqi 34 / 140mbit / s, rov ua dua tshiab ≈20km;

(1.31 \\ mu m) Ib Leeg - hom kev siv tshuab: tus nqi 140 / 565muct / s, repeater exacing 30 ~ 50mb (ntawm 140mbit / s);

(1.55 \\ mu m) Ib Leeg - hom kev siv tshuab: tus nqi ntau dua lossis sib npaug nrog 565muct / s, repeater exacing ≈70km.

(3) Kev faib tawm los ntawm Digital Matchexing Txoj Kev: Muab faib ua Pligiochronous Digital Hierarchy (SDH) Cov Tshuab:

PDH: Txhua qib hierinical theem muaj kev zam thiab yog asynchronous, tau txais qhov zoo los ua raws li plesiochronous multesxing; tus nqi tsawg dua lossis sib npaug rau 565muct / s.

SDH: Haum rau taw tes - rau -}} point / multipoint network kis; Ib qho wavelength nqi tuaj yeem ncav cuag 2.5gbit / s, 10gbit / s.

(4) Classification by transmission rate: Divided into 3 categories: 1) Low-speed systems: rate 2Mbit/s, 8Mbit/s; 2) Medium-speed systems: rate 34Mbit/s, 140Mbit/s; 3) High-speed systems: rate >565muct / s.

(5) Kev faib tawm los ntawm kev coj ua qauv: 1) Kev siv tes ua haujlwm zoo li qub): Hloov cov txheej txheem hauv lub teeb ntawm lub teeb ci; Cov khoom siv yooj yim, tus nqi qis, muaj kev ua tau zoo dua qub, Kev cuam tshuam tsawg rau ntawm txoj kab hluav taws xob tej kab ntsig, haum rau high- tus nqi sib txuas lus.