Nrog rau txoj kev loj hlob sai ntawm cov kev pabcuam cov ntaub ntawv, qhov kev thov rau bandwidth ntawm kev sib kis network tau nce siab dua. Kev lig kev cai PDH lossis SDH thev naus laus zis siv ib lub wavelength optical signal kis tau tus mob. Txoj kev sib kis no yog qhov pov tseg zoo ntawm qhov muaj peev xwm kho qhov muag fiber ntau, vim tias qhov bandwidth ntawm optical fiber ntau yuav luag tsis kawg piv rau ib leeg- wavelength channel tam sim no siv. DWDM thev naus laus zis tau los ua hauv qab no. Nws tsis tsuas yog nce lub peev xwm ntawm lub network, tab sis kuj ua rau tag nrho kev siv cov peev txheej ntawm cov khoom siv kho qhov muag fiber ntau thiab txo cov khoom pov tseg ntawm lub network.
Bandwidth thiab kev lag luam txwv kev daws teeb meem
a: Re-lay lub fiber optic cable
b: Txhim kho fiber ntau channel sib kis tus nqi
Kev siv TDM los nthuav lub peev xwm tau nce mus txog qhov txwv ntawm kev siv tshuab. Qhov siab dispersion ntawm cov nteg G.652 fiber txwv tsis pub kis tau tus mob siab tshaj 10Gbit / s.
c: Nce tus naj npawb ntawm wavelengths kis tau nyob rau hauv ib tug fiber ntau WDM
Kev txhim kho sai ntawm cov khoom siv optoelectronic, tshwj xeeb tshaj yog kev loj hlob thiab kev lag luam ntawm EDFA, ua rau nws siv tau DWDM thev naus laus zis hauv 1550nm qhov rais cheeb tsam. Los ntawm kev pom kev thiab kev lag luam, DWDM thev naus laus zis tam sim no yog qhov kev lag luam tshaj plaws thiab ua tau zoo nthuav dav siv tshuab.
Dab tsi yog wavelength division multiplexing?
DWDM system txhais
WDM: Multiplexing optical signals ntawm cov wavelengths sib txawv rau hauv tib lub optical fiber rau kev sib kis. Txoj kev no hu ua Wavelength Division Multiplexing (Wavelength Division Multiplexing)
Thaum qhov kawg tau txais, cov khoom siv kho qhov muag ntawm ntau lub wavelengths tau sib cais los ntawm ib qho demultiplexer, thiab tom qab ntawd ua tiav los ntawm optical receiver los kho qhov qub teeb liab.
DWDM: Lub sijhawm wavelength yog nyob nruab nrab ntawm 0.2 ~ 1.6nm, thiab lub caij nyoog wavelength yog qhov ntom. Piv nrog rau CWDM, nws muaj peev xwm loj dua, ntau cov channel, txhawb nqa EDFA optical amplification, thiab kev sib kis ntev dua.
Qhov zoo ntawm WDM:
Muaj peev xwm loj
Pob tshab cov ntaub ntawv kis tau tus mob
Kev xa mus ntev
Tau tshaj cov fiber ntau uas twb muaj lawm
Kev sib txuas yooj yim
Kev lag luam thiab kev ntseeg siab
Smooth expansion muaj peev xwm
Muaj lus nug txog DWDM system? Thov koj xav tiv tauj peb.
