Which constraint worsens inter-symbol interference when employing wavelength-division multiplexing (WDM) in long-haul fiber optic communications?

💡 Explanation

Chromatic dispersion broadens optical pulses as they propagate along the fiber because different wavelengths travel at slightly different speeds; therefore, spread pulses overlap, causing inter-symbol interference, rather than signals remaining distinct. Other options mitigate impairments.

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