CWDM, or Coarse Wavelength Division Multiplexing, is a technology used to increase the capacity of optical fiber networks by allowing multiple signals to be transmitted simultaneously over a single fiber using different wavelengths. This approach significantly boosts bandwidth without requiring additional fiber, making it cost-effective for telecommunication systems and data centers. CWDM typically utilizes a smaller number of channels compared to dense wavelength division multiplexing (DWDM), making it suitable for shorter distances and less complex applications.
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