CWDM used to be the popular choice in low capacity, short distance and low rate (up to 10G per wavelength) applications, as well as in networks where the initial requirement does not exceed 8 wavelengths. In addition, low cost entry point and the difference in economic scale make CWDM ideal for initial network set up. However, CWDM is limited as it cannot be amplified and does not support tunable DWDM 100G/200G/400G wavelengths. As the need for capacity grows, so does the demand to increase capacity by adding DWDM onto existing CWDM infrastructure. For more details, see DWDM over CWDM Network.
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