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← TechnologyWhich impairment dominates when WDM channel spacing shrinks?
A)Increased cross-talk impairments✓
B)Chromatic dispersion effects amplify
C)Polarization mode dispersion grows
D)Stimulated Brillouin scattering rises
💡 Explanation
Signal distortion increases due to wavelength division multiplexing (WDM); the **four-wave mixing** artifact generates new frequencies. This is due to fiber's third-order nonlinearity. Therefore cross-talk rises rather than pure dispersion effects, because closer spacing amplifies intermodulation products.
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