Fiber ua haujlwm band

Kev sib txuas lus fiber ntau siv lub teeb ua cov ntaub ntawv xa mus rau hauv cov tub ntxhais fiber ntau rau kev sib txuas lus.

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 muaj qhov sib txawv ntawm kev sib kis hauv cov fibers optical. Txhawm rau txo qhov poob ntau npaum li sai tau thiab xyuas kom muaj kev sib kis tau zoo, cov kws tshawb fawb tshawb fawb tau ua haujlwm nyuaj los nrhiav lub teeb pom kev zoo tshaj plaws.

850nm wb

Thaum xyoo 1970s, kev sib txuas lus fiber ntau tau pib ua cov txheej txheem ntawm kev siv. Thaum lub sij hawm ntawd, lub ntsiab kev tshawb fawb thiab kev loj hlob khoom yog multimode optical fiber. Multimode fiber ntau muaj ib txoj kab uas hla loj dua, tso cai rau cov qauv sib txawv ntawm lub teeb xa mus rau ib qho fiber ntau. Lub teeb siv thaum ntxov yog lub teeb nrog lub wavelength ntawm 850nm. Qhov band (band) no tseem hu ua 850nm band.

O-band

Tom qab ntawd, nyob rau xyoo 1970s thiab thaum ntxov 1980s, ib hom fiber ntau tau pib siv rau ntawm qhov loj. Tom qab kev sim, cov engineers pom tias lub teeb nyob rau hauv lub wavelength ntau ntawm 1260nm ~ 1360nm muaj cov teeb liab distortion tsawg tshaj plaws thiab qhov poob qis tshaj plaws los ntawm dispersion.

Yog li ntawd, lawv tau txais qhov wavelength ntau yam li qhov kev sib txuas lus kho qhov muag thaum ntxov thiab hu ua O-band (O-band). O, yog "Original (original)" txhais tau tias. Hauv 30 mus rau 40 xyoo tom ntej, tom qab kev tshawb nrhiav thiab kev xyaum ntev, cov kws tshaj lij tau maj mam xaus qhov "tsawg poob wavelength cheeb tsam", uas yog, thaj tsam 1260nm ~ 1625nm. Lub teeb nyob rau hauv no wavelength ntau yog haum rau kis tau tus mob nyob rau hauv optical fibers. Thaj chaw no tau muab faib ua tsib pawg, xws li O-band, E-band, S-band, C-band thiab L-band.

C-band

Feem ntau siv band hu ua C-band (1530nm ~ 1565nm). C, txhais tau tias "paub". C-band nthuav tawm qhov poob qis tshaj plaws thiab tau siv dav hauv thaj chaw hauv nroog, kev deb, ultra-ntev-ntev thiab submarine optical cable systems. Hauv WDM wavelength division multiplexing systems, C-band kuj tau siv ntau zaus.

L-band

L-band (1565nm ~ 1625nm) nyob ib sab ntawm C-band yog qhov poob qis thib ob thiab ib qho ntawm cov kev xaiv tseem ceeb hauv kev lag luam. Thaum C-band tsis txaus kom ua tau raws li qhov yuav tsum tau ua ntawm bandwidth, L-band tseem yuav raug siv los ua ib qho ntxiv. L, txhais tau tias "ntev wavelength (ntev wavelength)".

S band

S-band (1460nm ~ 1530nm), uas yog, "short-wavelength (short wavelength)" band, muaj fiber ntau poob dua li O-band. Nws feem ntau yog siv los ua qhov qis qis hauv PON (Passive Optical Network) systems.

Band

Thaum kawg, cia peb saib ntawm E-band. Cov qhab no tshwj xeeb me ntsis, nws yog qhov tsawg tshaj plaws ntawm tsib pawg. E txhais tau tias "ntxiv". Thaum koj saib xyuas kev sib raug zoo ntawm wavelength thiab poob tam sim no, koj yuav pom tias muaj qhov pom tseeb tsis meej pem hauv E-band. Qhov ntawd yog vim hydroxide ions (OH-) nqus nyob rau hauv 1370-1410nm band, yog li qhov poob nce ntau heev. Qhov no kuj tseem hu ua lub ncov dej.

Thaum ntxov, vim cov txheej txheem kev txwv, dej (OH pawg) impurities feem ntau tseem nyob hauv cov iav fiber ntau optical, uas ua rau lub siab tshaj plaws attenuation ntawm E-band, uas tsis tuaj yeem siv ib txwm.

Tom qab ntawd, lub tshuab ua kom lub cev qhuav dej hauv cov txheej txheem iav tau tsim, thiab qhov attenuation ntawm feem ntau siv fiber ntau optical (ITU-T G.652.D) hauv E-band tau qis dua li hauv O-band. (Cov fiber ntau no tseem hu ua cov dej tsis tshua muaj fiber ntau lossis tsis muaj dej ncov fiber ntau.)

Txawm li cas los xij, txij li ntau cov fiber ntau optic cables uas twb muaj lawm ntsia ua ntej 2000 qhia siab attenuation hauv E-band, E-band yog dav siv hauv kev sib txuas lus kho qhov muag. Tseem muaj qee qhov kev txwv rau kev siv.

U-band

Ntxiv nrog rau cov kab saum toj no, yeej muaj lwm qhov band uas yuav siv tau, thiab qhov ntawd yog U-band (ultra-ntev-wavelength band, ultra-ntev-wavelength band: 1625-1675} nm). U-band feem ntau yog siv rau kev saib xyuas network.

Cov ntsiab lus