Kev tsim cov tshuaj fiber ntau
Thawj theem ntawm kev tsim kho fiber ntau yog yug ntawm multimode optical fiber ntau.
Ntau hom kho qhov muag fiber ntau qhib lub qhov rai thawj rau pab pawg cable thov. Cov tswv yim txog ntawm ntau hom optical fiber ntau tau muab lub tswv yim tias optical fiber yuav siv tau rau kev sib txuas lus, thiab cov ntsiab lus piav qhia qhov kev pom tias nws muaj peev xwm los txo qhov poob mus rau 20dB / km. Qhov poob ntawm thawj cov kab ntawm ntau hom tiav fiber ntau yog 20dB / km, uas txuas ntxiv qhov tseeb qhov ua tau ntawm fiber ntau li qhov sib txuas lus nruab nrab.
Hauv lub tshuab hluav taws xob semiconductor laser (GaAs) raws li cov khoom siv, vim nws qhov me me, nws tau siv dav hauv kev sib txuas lus kho qhov muag fiber ntau, txo cov kis mus los ntawm cov hluav taws xob optical mus rau 4dB / km thiab lub suab yoj mus txog 850nm. Cov era ntawm kev sib txuas lus fiber ntau Nws' s teb ntawm no.
Cov roj ntsha fiber ntau qhov ntxov tshaj plaws muaj qhov nce ntawm 3.0-3.5dB / km, qhov ntsuas ntawm 200-800MHz · km, thiab tus lej siv ntawm 0.20 ± 0.02 lossis 0.23 ± 0.02.
Qhov theem ob ntawm kev tsim kho fiber ntau: ib hom kho qhov muag fiber ntau
Qhov thib ob theem yog hu ua lub qhov rais thib ob. Attenuation ntawm A1a fiber ntau yog 0.8-1.5dB / km, thiab bandwidth yog 200-1200MHz · km. Attenuation ntawm A1b fiber ntau yog 0.8-1.5dB / km, thiab bandwidth yog 200-1000MHz · km. Lub siab siv hluav taws xob LED siv nyob rau hauv nrog lawv muaj cov kab hluav taws xob dav dav 120nm, kev txhaj tshuaj lub zog ntawm 20μW, thiab tus nqi siab tshaj plaws ntawm 100Mb / s.
Qhov thib peb theem ntawm kev tsim kho fiber ntau.
1982-1992 yog lub sijhawm ntawm kev thov loj ntawm G.652, G.653, thiab G.654 ib hom fiber ntau, qhib lub qhov rai thib ob (1310nm) thiab lub qhov rais thib (1550nm) ntawm fiber ntau. Nyob rau lub sijhawm no, ib lub fiber nrog lub ntsej muag sib txuas hloov dua lub ntuag tseem raug tsim tawm. Nws tsis tsuas yog poob qis ntawm 1550nm, tab sis kuj tseem muaj qis microbending poob, uas haum rau cov kab kev sib tw ntev hauv txoj kab thiab submarine optical cable systems siv optical amplifiers.
Nyob rau theem plaub ntawm kev tsim kho fiber ntau, qhov kho qhov muag fiber ntau qhov rai tau qhib tag nrho thiab cov yam ntxwv tau nthuav dav.
Qhov kho qhov muag sib txuas lus fiber ntau tau nthuav dav rau 4, 5 qhov rais thiab S-band. Qhov kho qhov muag sib txuas lus fiber ntau tau qhib kom tiav. Plaub hom tshiab ntawm cov khoom siv kho qhov muag tau tsim tshiab, thiab cov yam ntxwv kho qhov muag tau ua tau zoo dua qub.
(1) Tsis-xoom dispersion-hloov ib leeg hom fiber ntau G.655 fiber (qhov thib peb thiab thib plaub qhov rais)
Txhawm rau kom pom plaub nthwv dej sib xyaw (FWM) thiab hla kev sib cais (XPM) hauv Dense Wavelength Division Multiplexing (DWDM) thiab txo qhov tsis cuam tshuam kev cuam tshuam ntawm cov kho qhov muag, tsis xoom dispersion hloov pauv fiber ntau (WZDSF) tawm hauv Xyoo 1993 Txog.
(2) Cov dej tsis siab ntawm cov kab hluav taws xob ntau hom fiber ntau G.652C (lub qhov rais thib tsib)
Nyob rau xyoo 1998, Lucent tau tsim cov kab hluav taws xob tag nrho (piv txwv li, cov dej ntim hluav taws xob tsawg kawg nkaus), uas ua rau 1383nm dej ncov yuav luag tsis muaj nyob (attenuation< 0.31db="" km),="" thiab="" qhib="" lub="" qhov="" rais="" thib="" tsib="" ntawm="" fiber="" ntau,="" uas="" yog,="" e-qhab="">
Tom qab xyoo 2002, ib hom fiber ntau muaj cov yeeb yam zoo tshaj plaws hauv qhov ntev ntawm 1260nm txog 1625nm.
