Which phenomenon causes signal degradation in long-distance optical fiber communication?

💡 Explanation

When light propagates long distances in optical fiber, different wavelengths travel at slightly different speeds due to chromatic dispersion, because the refractive index varies with wavelength, causing pulse broadening and signal overlap. Therefore chromatic dispersion causes signal degradation, rather than polarization mode which causes signal distortion, macrobending which induces bending loss, or uniform material absorption.

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