Which phenomenon causes signal distortion in a single-mode optical fiber over long distances?

💡 Explanation

When light pulses propagate through a single-mode fiber, chromatic dispersion occurs because different wavelengths travel at slightly different speeds, broadening the pulses and causing intersymbol interference. Therefore pulse broadening occurs, rather than intensity attenuation, modal noise, or polarization changes which depend on scattering, multimode interference, or material properties respectively.

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