Nrog rau txoj kev loj hlob sai ntawm 5G tes hauj lwm, qhov kev thov rau kev sib txuas cov ntaub ntawv network tau nce exponentially. Raws li lub hauv paus tus neeg tuav lub network, qhov muaj peev xwm kis tau tus mob optical network yog qhov tseem ceeb rau kev txhim kho 5G tes hauj lwm. Ib qho ntawm cov riam phom ua khawv koob kom nthuav dav lub peev xwm kis tau tus mob ntawm cov khoom siv kho qhov muag yog txuas ntxiv mus khawb tob rau hauv cov peev txheej muaj peev xwm ntawm cov khoom siv kho qhov muag, uas yog, txuas ntxiv nthuav dav txoj kev sib kis dav ntawm cov khoom siv kho qhov muag. Qhov dav ntawm txoj kev kis tau tus mob, lub peev xwm kis tau tus mob ntawm optical network yuav ib txwm nce. Tom ntej no, kuv yuav tham nrog koj txog cov bands ntawm optical fiber.
Cov kab lig kev cai
Raws li lub npe implies, optical fiber kev sib txuas lus yog kev sib txuas lus nyob rau hauv uas lub teeb yog siv raws li ib tug xov tooj ntawm cov ntaub ntawv, thiab optical fiber yog siv raws li ib tug kis tau tus mob nruab nrab. Txawm li cas los xij, tsis yog txhua lub teeb haum rau kev sib txuas lus fiber ntau. Qhov sib txawv wavelengths ntawm lub teeb (uas tuaj yeem nkag siab yooj yim raws li lub teeb nrog cov xim sib txawv) muaj qhov sib txawv ntawm qhov sib txawv hauv cov fibers optical. Lub teeb nrog kev sib kis loj tsis tuaj yeem nqa cov ntaub ntawv hauv cov khoom siv fiber ntau.
Tom qab kev tshawb fawb ntev los ntawm cov kws tshawb fawb, nws tau xub pom tias lub teeb nrog lub wavelength ntawm 850nm tuaj yeem siv los ua lub teeb rau kev sib txuas lus kho qhov muag. Lub waveband no tseem hu ua 850nm waveband. Txawm li cas los xij, qhov kev poob qis hauv thaj tsam wavelength ntawm 850nm band yog qhov loj, thiab tsis muaj fiber ntau amplifier tsim nyog. Yog li, 850nm band tsuas yog tsim rau kev sib kis luv luv.
Tom qab ntawd, cov kws tshawb fawb tau tshawb nrhiav "tsawg-tsawg wavelength cheeb tsam" kho qhov muag band, uas yog, lub teeb hauv thaj tsam 1260nm ~ 1625nm, uas yog qhov tsim nyog tshaj plaws rau kev sib kis hauv cov fibers optical. Saib daim duab hauv qab no rau kev sib raug zoo ntawm kev sib kis tsis tau thiab kho qhov muag band.
O-band yog dab tsi?
O-band yog thawj band 1260-1360 nm. O-band yog thawj wavelength band keeb kwm siv rau kev sib txuas lus kho qhov muag, nrog cov teeb liab me me distortion (vim dispersion).
E-band yog dab tsi?
E-band (ntxiv wavelength band: 1360-1460 nm) yog qhov tsawg tshaj plaws ntawm cov qhab no. E-band feem ntau yog siv los ua kev txuas ntxiv ntawm O-band, tab sis muaj ob peb daim ntawv thov, feem ntau vim tias muaj ntau cov khoom siv kho qhov muag pom tau tias muaj kev cuam tshuam loj hauv E-band, thiab cov txheej txheem tsim khoom siv zog heev, yog li nws siv hauv kev sib txuas lus kho qhov muag. yog txwv.
S-band yog dab tsi?
Cov fiber ntau poob hauv S-band (Short-wavelength Band) (short-wavelength band: 1460-1530} nm) qis dua li hauv O-band, thiab S-band siv ntau PON (passive optical network) systems.
C band yog dab tsi?
C-band (Conventional Band) yog li ntawm 1530 nm mus rau 1565 nm, sawv cev rau cov pa band. Optical fiber nthuav qhia qhov poob qis tshaj plaws hauv C-band thiab muaj txiaj ntsig zoo dua hauv kev sib kis mus ntev. Nws feem ntau yog siv nyob rau hauv ntau lub nroog, ntev-ntev, ultra-ntev-distance thiab submarine optical kis systems ua ke nrog WDM thiabEDFAtshuab. C-band ua ntau dua thiab tseem ceeb dua vim qhov kev sib kis tau ntev dua thiab fiber ntau amplifiers tau siv los ntawm optical-rau-electron-to-optical repeaters. Kev siv C-band nthuav dav nrog qhov tshwm sim ntawmDWDM(Dense Wavelength Division Multiplexing), uas tso cai rau ntau lub teeb liab sib qhia ib leeg.
L-band yog dab tsi?
L-band (Long-wavelength Band) (ntev-wavelength band: 1565-1625 nm) yog qhov thib ob qis tshaj-tsawg wavelength band thiab feem ntau siv thaum C-band tsis txaus kom tau raws li qhov yuav tsum tau muaj bandwidth. Nrog rau qhov muaj ntau ntawm b-doped fiber amplifiers (EDFAs), DWDM systems tau txuas ntxiv mus txog L-band, thiab tau pib siv los txuas ntxiv lub peev xwm ntawm terrestrial DWDM optical networks. Tam sim no, nws tau raug qhia rau submarine cable tswv ua tib yam - nthuav tag nrho lub peev xwm ntawm submarine cables.
Vim tias qhov kev sib kis tsis zoo ntawm ob lub qhov rais kis tau tus mob C-band thiab L-band yog qhov tsawg tshaj plaws, lub teeb liab teeb liab hauv DWDM system feem ntau yog xaiv hauv C-band thiab L-band. Ntxiv rau O-band mus rau L-band, muaj ob pawg lwm pawg, 850 nm band thiab U-band (ultra-ntev band: 1625-1675 nm). Lub 850 nm band yog qhov tseem ceeb ntawm lub wavelength rau multimode fiber optic kev sib txuas lus nrog VCSELs (Ntaus Kab Tsuag Nto Emitting Lasers). U-band feem ntau yog siv rau kev saib xyuas network.
