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← ScienceWhich outcome occurs when atmospheric turbulence reduces coherence across a laser beam used in free-space optical communication?
A)Increased bit error rate✓
B)Enhanced signal modulation efficiency
C)Narrowed beam divergence angle
D)Decreased power supply demand
💡 Explanation
Increased bit error rate occurs because atmospheric turbulence causes beam spreading, reducing the effectiveness of spatial filtering; this leads to signal degradation through wavefront distortions—called scintillation. Because the beam loses intensity coherence, therefore the signal becomes unrecoverable, rather than improving for modulation.
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