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← ScienceWhich mechanism causes increased signal attenuation in a fiber optic cable bent beyond its minimum bend radius?
A)Mode coupling causes signal dispersion✓
B)Material absorption raises refractive index
C)Rayleigh scattering increases exponentially
D)Fresnel reflection causes signal refraction
💡 Explanation
When bent beyond the minimum radius, mode coupling occurs because the waveguide condition is violated, distributing power to higher-order modes which leak out, increasing attenuation. Therefore, signal dispersion rises, rather than others which need material defects, particle interaction, or angle of incidence issues respectively.
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