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Which limitation arises under increased photodiode laser drive current?

A)Decreased spatial coherence reduces focal quality
B)Increased resistance leads to thermal runaway
C)Reduced quantum efficiency lowers sensitivity
D)Excess carriers cause modulation bandwidth narrowing

💡 Explanation

Sufficiently driving a laser photodiode increases beam divergence and thus, reduces coherence; because the drive current is beyond gain saturation. Therefore spatial coherence degrades, rather than other failure modes like thermal runaway, at this operating condition.

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