Overview:
Expanding fiber capacity with WDM
What’s Mux and Demux
CWDM vs DWDM
What does optical add-drop multiplexer stand for
WDM bands
WDM technology: TFF and AWG
WDM-PON in access network
WDM in 5G network
Wavelength Division Multiplexing (WDM) is one of the most common ways of using wavelengths to increase bandwidth by multiplexing various optical carrier signals onto a single optical fiber. It combines a series of optical carrier signals with different wavelengths carrying various information and coupled to the same optical fiber for transmission at the transmitting end. At the receiving end, optical signals of various wavelengths are separated by a demultiplexer. This technique of simultaneously transmitting two or many different wavelengths in the same fiber is called wavelength division multiplexing, or WDM.
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Optical Passive Components 