Which mechanism limits the bandwidth of a fiber optic cable for long-distance signal propagation?

💡 Explanation

When a broadband signal propagates long distances, chromatic dispersion causes different wavelengths to travel at slightly different speeds due to wavelength-dependent refractive index, broadening the pulses and limiting bandwidth. Therefore, chromatic dispersion limits bandwidth, rather than scattering, birefringence, or reflection, which have different attenuating effects.

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