Wavelength Division Multiplexing (WDM) is a technology used in optical fiber communication networks to transmit multiple optical signals over a single optical fiber by using different wavelengths of light. WDM multiplexing allows for multiple data streams to be transmitted simultaneously over a single optical fiber, increasing the overall capacity of the network.
WDM Multiplexing
There are two types of WDM multiplexing: Coarse Wavelength Division Multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM).
- CWDM uses a wider spacing of wavelengths to allow for up to 18 channels to be transmitted over a single optical fiber. CWDM is typically used for short-haul transmissions, such as within a campus or metropolitan area network.
- DWDM, on the other hand, uses a narrower spacing of wavelengths to allow for up to 160 channels to be transmitted over a single optical fiber. DWDM is typically used for long-haul transmissions, such as across continents or undersea cables.
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