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← ScienceWhich effect diminishes during long-distance fiber optic transmission due to reduced laser coherence?
A)Chromatic dispersion increases signal spreading✓
B)Stimulated Raman scattering raises intensity
C)Bragg scattering enhances signal back-reflection
D)Polarization mode dispersion decreases modal separation
💡 Explanation
Chromatic dispersion increases fiber optic pulse spreading because the laser's coherence length decreases over the transmission distance; therefore, different wavelengths interfere destructively, rather than maintaining a sharp pulse front like in short-distance transmission.
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