Which mechanism causes chromatic dispersion when light pulses propagate through optical fiber communication lines?

💡 Explanation

When light pulses propagate, chromatic dispersion occurs because the refractive index of the fiber material varies with wavelength, causing different wavelengths within the pulse to travel at slightly different speeds. Therefore wavelength dependence results, rather than scattering, reflection or mode coupling which relate to different mechanisms related to losses and fiber deformation.

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