What term describes multiplexing that uses different wavelengths to carry signals on a single optical fiber?

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Using different wavelengths of light to carry multiple signals on a single optical fiber is called wavelength-division multiplexing (WDM). The idea is to assign each data stream its own light color, or wavelength, and send them together down the same fiber. At the receiving end, a demultiplexer separates the wavelengths so each signal can be decoded independently. This approach dramatically increases fiber capacity without laying more fiber, and it can be deployed in variants like CWDM or DWDM depending on channel spacing and the number of wavelengths. The other terms don’t fit this concept: Pulse Code Modulation is about digitizing analog signals, a Balun converts between balanced and unbalanced lines, and Frequency Division Multiplexing uses different RF frequencies on a medium rather than distinct optical wavelengths.