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Which outcome occurs when injecting incoherent light into a fibre-optic gyroscope?

A)Increased drift error in measurement
B)Enhanced signal-to-noise output ratio
C)Suppressed non-reciprocal phase shifts
D)Reduced susceptibility to thermal gradients

💡 Explanation

The drift error increases when using incoherent light due to reduced constructive interference; the Sagnac effect depends on high coherence. The mechanism is reduced interference fringe contrast because incoherent sources have short coherence lengths therefore accurate phase measurement is impossible, rather than alternatives.

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