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what is the difference between cwdm and dwdm?
The main difference between CWDM (Coarse Wavelength Division Multiplexing) and DWDM (Dense Wavelength Division Multiplexing) is in channel spacing. CWDM uses wider spacing (typically 20 nm), allowing for up to 18 channels, making it suitable for shorter distances. In contrast, DWDM has narrower spacing (0.8 to 1.6 nm), enabling many more channels (up to 80 or more) for long-distance transmission.
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