Wavelength division multiplexing is time division multiplexing
Wavelength division multiplexing is a kind of frequency division multiplexing — a technique where optical signals with different wavelengths are combined, transmitted together, and separated again. In FDM, we can observe a lot of inter-channel cross-talk because in this type of multiplexing the bandwidth is. This makes it possible to scale capacity cost-effectively by using existing infrastructure more efficiently.
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