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Which effect reduces single-mode fiber optic transmission rates when source coherence degrades?

A)Modal dispersion increases abruptly
B)Polarization mode dispersion worsens
C)Stimulated Brillouin scattering increases
D)Four-wave mixing becomes unstable

💡 Explanation

Increased linewidth reduces the threshold for stimulated Brillouin scattering because higher source coherence enables stronger interaction with acoustic phonons within the fiber. Therefore, signal power is scattered, rather than modal/polarization dispersion increases or instability in four-wave mixing.

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