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← ScienceWhich condition would cause signal fading in intercontinental submarine fiber optic cables?
A)Increased seawater impurity content
B)Nonlinear polarisation mode dispersion✓
C)Thermally induced Brillouin scattering
D)Increased cable core refractive index
💡 Explanation
Signal fading occurs because birefringence in the fiber causes polarisation mode dispersion; it's nonlinear because higher intensities create Kerr effect; this varies arrival times. Therefore dispersion causes frequency selective fading, rather than absorption from impurities or scattering.
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