Wavelength division multiplexing (WDM), suav nrog CWDM (coarse wavelength division multiplexing) thiabDWDM(dense wavelength division multiplexing), thiab lwm yam. Nws yog hais txog kev sib txuas ntawm ntau lub teeb liab ntawm qhov sib txawv wavelengths ntawm ib qho fiber ntau rau tib lub sijhawm sib kis.
Nws muaj multiplexer thiab de-multiplexer. Lub multiplexer (MUX) sib txuas ntau lub teeb liab wavelengths hauv ib qho fiber ntau rau kev sib kis ntawm sab transmitter; lub de-multiplexer (DEMUX) cais ntau lub wavelength signals kis nyob rau hauv ib tug fiber ntau ntawm receiver sab. Lub hom phiaj tseem ceeb ntawm WDM yog txhawm rau ua kom muaj qhov muaj bandwidth ntawm fiber ntau, uas tuaj yeem nthuav dav los ntawm WDM yam tsis tas yuav nteg ntau fibers.
Dab tsi yog qhov txawv ntawm CWDM thiab DWDM?
1. Lub sijhawm sib txawv wavelength
CWDM: wavelength interval Ntau dua lossis sib npaug rau 20nm, tag nrho 18 bands ntawm 1270nm ~ 1610nm nrog 20nm ntu,
DWDM: wavelength interval<10nm, usually using 1528nm~1565nm band with wavelength interval of 200GHz (1.6nm), 100GHz (0.8nm) or 50GHz (0.4nm)
2. Modulated lasers txawv
Feem ntau, CWDM modulated lasers siv uncooled lasers, thaumDWDMsiv cov lasers txias. Lub laser txias siv qhov ntsuas kub, thiab lub laser tsis txias siv hluav taws xob tuning.
