Within Dense Wavelength Division Multiplexing (DWDM) fiber optic systems, which outcome accelerates as channel spacing decreases?

💡 Explanation

Four-wave mixing (FWM) increases rapidly because it's a nonlinear effect dependent on higher optical power densities at narrower channel spacings, leading to signal degradation. Therefore, FWM interference rises, rather than benefits like dispersion reduction, arising from other signal control strategies.

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