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← ScienceWhich outcome explains the chromatic dispersion increase when extending a single-mode fiber optic cable beyond its designed length for 1550 nm light?
A)Increased intermodal interference reduces data.
B)Material dispersion broadens arriving pulses.✓
C)Fresnel reflections cause signal attenuation.
D)Raman scattering degrades the signal.
💡 Explanation
Increased cable length causes higher order mode excitation, leading to increased material dispersion, because different wavelengths travel at different speeds within the fiber. Therefore pulse broadening is amplified, rather than intermodal distortion as in multimode fiber.
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