Ntev Ntau Txiav: CWDM thiab DWDM

Ntev Ntau Txiav: CWDM thiab DWDM

CWDM: Ib qho kev lag luam hauv nruab nrab ntawm kev lag luam nruab nrab siv txog yim wavelengths, qhov tswv yim no yog hu ua coarese wavelengtb division multiplexing (CWDM), raws li ITU-T (txhua txoj kab nruab nrab ntawm 8 thiab 50 nm). Kev pom zoo ITU-T pom zoo nyob rau lub Rau Hli xyoo 2014, txuas rau qhov no mus rau 1270 nm (18 wavelengths), npaj siab tias yuav npaj cov lag luam muaj fiber ntau tsis muaj "dej ncov" ntawm qhov kis ntawm 1310-nm thiab 1550-nm kis tau tus mob, Tshooj. Xws li txoj kev npaj kev sib txuas ncua ntev, tsuas yog siv rau cov tsis ua haujlwm nkaus xwb kom txog thaum lub sij hawm zoo li qhov kho qhov muag pom tau zoo nrog kev sib txuas ntxiv ntawm cov neeg siv bandwidths.

DWDM: Lub Chaw Sib Tham Thoob Ntiaj Teb Thoob Ntiaj Teb (ITU) tau txhais tias yuav siv ntau tshaj 45 wavelengths hauv peb qhov rai thiab nws qhov kev sib txuas ntxiv lawm cais hauv qee lub tshuab los muab ob npaug rau ntawd. Cov kev cai hais tseg channel yog rau cov kis ntawm 100 GHz sib nrug (li 0.8 nm). Txawm hais tias tsis yog 200-GHz, 100-GHz, los sis 50-GHz spacings, qhov kev pab them nqi yuav raug xa mus rau kev sib faib ntom ntom ntom (DWDM). (Ntau ntxiv txog DWDM: DWDM WIKI)

Ib cov khoom muaj nuj nqis yog hom rau tag nrho cov kev npaj, txhua yam nrog rau cov cuab yeej siv technology hauv RF.

♦ Cov cua ntsawj ntshab txav ze dua, qhov nyuab dua (thiab kim tshaj) nws yog cais tawm hauv cov demultiplexers thiab ib txhij ua kev sib txuas ntawm cov dej uas nyob ze, tsawg heev hauv kev sib haum ntawm cov dej, thiab tsis tau qis dua.

♦ Qhov ze lub wavelengths tau nrawm, qhov yuav tsum tau muaj zog tshaj plaws ntawm qhov sib tw ntawm lub transmitters.

♦ Qhov ze lub wavelengths tau zoo, qhov zoo dua qhov kev sib kis ntawm cov teeb meem sib kis. Plaub-nthwv dej sib xyaw thiab qauv khaub lig theem yog ob qho tib si thaum lub teeb meem khiav mus ze ntawm tib qho kev tshaj tawm. Lub degree ntawm txuam yog, ntawm chav kawm, tseem nyob rau fiber ntau dispersionm nrog txheem fiber muaj siab dispersion ntawm 1550 nm tab sis tsawg dispersion ntawm 1310 nm. Los ntawm kev sib piv, kaw wavelength nruam ua rau txo crosstalk los ntawm stimulated Raman scattering. Cov mechanisms no yog tham tom qab.

♦ Cov kab ntau dua uas sib koom siv fiber ntau, qhov qis dua yuav tsum yog lub zog ntawm ib lub sijhawm ntev npaum li cas rau kev sib txuam ntawm kev sib koom ua ke vim cov iav tsis muaj iav.

Raws li pom hauv daim duab qhia tau hais tias kev sib raug zoo ntawm kev sib tw, CWDM channels, thiab DWDM channels. Gable systems siv linear DWDM technology feem ntau siv 200-GHz-spaced channels ntawm cov txheej 20 teev hauv Table 1, tab txawm ob peb tus neeg muag khoom muaj kev sib tw 100GHz. Rau kev tsim network tsim uas siv tsawg dua 20 ntawm cov teev wavelengths, ntau tus neeg muag khoom tau xaiv los muab cov kev cai sib txawv.

Kev sib raug zoo ntawm cov hlua nruab ntug.

Wavelength Division Multiplexing

Feem ntau muab C21 dhau los C35 ua tus thawj yim, tab sis tsis muaj tus muag khoom muaj C39 los ntawm C53 li ob yim, lwm muaj C45 txog C59, thiab ib feem peb tau xaiv kom muab C37 los ntawm C51. Qhov no yog obviously tsis yooj yim rau cov neeg lag luam uas xav kom muaj ntau qhov chaw rau optical transmitters thiab DWDM Multiplexer.