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← TechnologyIn dense wavelength-division multiplexing, which impairment arises with increased channel count?
A)Four-wave mixing amplification occurs✓
B)Polarization mode dispersion decreases
C)Chromatic dispersion becomes negligible
D)Self-phase modulation bandwidth diminishes
💡 Explanation
Four-wave mixing arises from the Kerr effect, whereby increased optical power from dense channels induces nonlinear interactions; because power levels increase, new frequencies are generated within fiber rather than signal strengthening. Therefore significant inter-channel interference results, rather than mitigating dispersion or improving bandwidth.
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