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Which performance drop occurs when coherence degrades within optical fiber?

A)Increased bit error rate
B)Reduced laser power output
C)Elevated fiber core temperature
D)Lower refractive index uniformity

💡 Explanation

Increased bit error rate results because modal dispersion alters the phase relationships; this dephasing directly weakens constructive interference otherwise sustaining pulse shape during transmission. This degradation increases errors, therefore impacting communications, rather than directly affecting output power or fiber properties.

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