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← ScienceWhich 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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