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Which limit arises in long-distance optical fiber links when laser coherence decreases?

A)Increased chromatic dispersion
B)Reduced signal-to-noise ratio
C)Enhanced stimulated Brillouin scattering
D)Decreased data transmission bitrate

💡 Explanation

Decreased laser coherence increases the laser's spectral bandwidth; the mechanism is chromatic dispersion, spreading different wavelengths at varying speeds. This introduces pulse broadening because the arrival times change, therefore increasing chromatic dispersion, rather than improving bitrate without this effect.

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