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← ScienceWhich mechanism causes chromatic dispersion when light pulses propagate through optical fiber communication lines?
A)Wavelength dependence of refractive index✓
B)Rayleigh scattering from material impurities
C)Fresnel reflection at fiber connections
D)Mode coupling due to fiber bending
💡 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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