Which error propagation risk increases significantly when applying wavelength-division multiplexing (WDM) on long-haul fiber optic communication links?

💡 Explanation

Four-wave mixing creates additional optical frequencies from existing channels, increasing crosstalk because the nonlinear optical effect causes wavelengths to interfere, potentially corrupting adjacent channels. Therefore, signal integrity degrades rather than only polarization or chromatic dispersion which affect pulse shape.

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