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← ScienceWhich phenomenon causes signal fading in fiber optic cables utilizing laser light?
A)Modal dispersion broadens the pulses.✓
B)Rayleigh scattering reflects shorter wavelengths.
C)Stimulated emission increases signal strength.
D)Fresnel diffraction sharply bends the light.
💡 Explanation
Modal dispersion broadens light pulses within the fiber optic strands because different modes travel at slightly differing speeds. Therefore, pulse broadening causes signal fading, rather than scattering or changes to intensity which do not primarily limit bandwidth.
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