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← ScienceWhich outcome occurs when the coherence length of laser decreases inside a fiber-optic gyroscope?
A)Random phase fluctuations increase✓
B)Interference fringe visibility increases
C)Signal-to-noise ratio improves
D)Polarization-maintaining behavior improves
💡 Explanation
Reduced coherence length increases random phase fluctuations due to a larger spectral bandwidth; Optical Path Difference mismatch causes decoherence because shorter coherence means less temporal overlap; therefore, noise floor increases rather than increased fringe visibility under constant power.
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