Txawm hais tias kev sib txuas hauv zej zog lossis kev sib kis thoob ntiaj teb, kev ceev thiab qhov tseeb yog ob qhov tseem ceeb rau kev sib txuas lus fiber ntau uas muaj kev sib txuas lus tseem ceeb. Cov neeg siv xav tau kev sib txuas FTTH sai dua thiab 5G kev sib txuas xov tooj ntawm tes kom ua tiav telemedicine, autonomous tsheb, video conferencing thiab lwm yam kev siv bandwidth intensive. Nrog rau qhov tshwm sim ntawm ntau qhov chaw cov ntaub ntawv thiab kev txhim kho sai ntawm kev txawj ntse thiab kev kawm tshuab, ua ke nrog kev sib txuas ceev ceev thiab kev txhawb nqa ntawm 800G thiab siab dua, txhua tus yam ntxwv fiber ntau tau dhau los ua qhov tseem ceeb.
Raws li tus qauv ITU-T G.650.3, optical time domain reflectometer (OTDR), optical loss testing device (OLTS), chromatic dispersion (CD), thiab polarization mode dispersion (PMD) tests yuav tsum tau ua kom paub fiber ntau txheeb xyuas thiab xyuas kom muaj kev ua haujlwm siab hauv network. Yog li, kev tswj hwm CD qhov tseem ceeb yog qhov tseem ceeb rau kev ua kom muaj kev sib raug zoo thiab kev ua haujlwm zoo.
Txawm hais tias CD yog cov yam ntxwv ntawm txhua qhov kho qhov muag fibers, uas yog qhov txuas ntxiv ntawm broadband pulses nyob rau qhov ntev, raws li tus qauv ITU-T G.650.3, dispersion dhau los ua teeb meem rau cov fibers optical nrog cov ntaub ntawv xa tawm ntau tshaj 10 Gbps. CD tuaj yeem cuam tshuam rau lub teeb liab zoo, tshwj xeeb tshaj yog nyob rau hauv kev sib txuas lus ceev ceev, thiab kev ntsuam xyuas yog tus yuam sij los daws qhov teeb meem no.
CD yog dab tsi?
Thaum lub teeb pulses ntawm txawv wavelengths propagate nyob rau hauv optical fibers, lub dispersion ntawm lub teeb yuav ua rau cov mem tes sib tshooj thiab distortion, thaum kawg ua rau ib tug txo nyob rau hauv qhov zoo ntawm cov teeb liab kis tau tus mob. Muaj ob hom dispersion: khoom dispersion thiab waveguide dispersion.
Cov khoom tawg yog ib qho tseem ceeb hauv txhua hom fiber ntau optical, uas tuaj yeem ua rau cov wavelengths sib txawv los nthuav tawm ntawm qhov sib txawv, thaum kawg ua rau lub wavelengths ncav cuag cov chaw taws teeb transceiver ntawm lub sijhawm sib txawv.
Waveguide dispersion tshwm sim nyob rau hauv lub waveguide qauv ntawm optical fibers, qhov twg optical signals propagate los ntawm cov tub ntxhais thiab cladding ntawm fibers, uas muaj sib txawv refractive indices. Qhov no ua rau muaj kev hloov pauv ntawm txoj kab uas hla ntawm hom teb thiab qhov sib txawv ntawm cov teeb liab tshaj tawm ntawm txhua lub wavelength.
Kev tuav ib qib ntawm CD yog qhov tseem ceeb kom tsis txhob tshwm sim ntawm lwm yam kev cuam tshuam tsis zoo, yog li tsis muaj CD tsis pom zoo. Tab sis CD yuav tsum tau tswj hwm nyob rau hauv ib qho kev pom zoo kom tsis txhob muaj kev cuam tshuam tsis zoo rau lub teeb liab kev ncaj ncees thiab kev pabcuam zoo.
Dab tsi yog qhov cuam tshuam ntawm fiber ntau ntawm kev tawg?
Raws li tau hais ua ntej lawm, CD yog qhov muaj txiaj ntsig zoo ntawm cov fiber ntau optical, tab sis hom fiber ntau ua lub luag haujlwm tseem ceeb hauv kev tswj CD. Cov neeg ua haujlwm hauv lub network tuaj yeem xaiv "natural" dispersion fibers lossis fibers nrog dispersion curves offset los txo qhov cuam tshuam ntawm CD nyob rau hauv ib qho kev sib txawv wavelength.
Feem ntau siv fiber ntau hauv cov tes hauj lwm niaj hnub no yog tus qauv ITU-T G.652 fiber ntau nrog ntuj dispersion. ITU-T G-653 xoom dispersion hloov pauv fiber ntau tsis txhawb DWDM kis tau tus mob, thaum G.655 tsis-zero dispersion hloov fiber ntau muaj qis dua CD, tab sis tau ua kom zoo rau qhov ntev thiab tseem kim dua.
Thaum kawg, cov neeg ua haujlwm yuav tsum nkag siab txog hom fiber ntau optics hauv lawv cov tes hauj lwm. Yog tias feem ntau ntawm cov fibers kho qhov muag yog tus qauv G.652, tab sis qee qhov yog lwm hom fibers, yog tias cov CDs hauv txhua qhov txuas tsis pom, qhov kev pabcuam zoo yuav raug cuam tshuam.
Hauv kev xaus
Chromatic dispersion tseem yog ib qho kev sib tw uas yuav tsum tau hais kom ntseeg tau tias muaj kev ntseeg siab thiab ua haujlwm zoo ntawm kev sib txuas lus siab. Cov yam ntxwv ntawm fiber ntau thiab kev ntsuam xyuas yog qhov tseem ceeb rau kev daws qhov tsis sib haum xeeb, muab kev nkag siab rau cov kws tshaj lij thiab cov kws tshaj lij los tsim, siv, thiab tswj kev tsim kho vaj tse uas muaj kev sib txuas lus tseem ceeb hauv ntiaj teb. Nrog rau kev txhim kho txuas ntxiv thiab nthuav dav ntawm lub network, Softel yuav txuas ntxiv tsim kho tshiab thiab nthuav tawm cov kev daws teeb meem rau kev ua lag luam, coj txoj hauv kev los txhawb kev siv cov thev naus laus zis tshiab.
Post lub sij hawm: Mar-20-2025