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Which instability causes signal extinction in long-haul fiber?

A)Stimulated Brillouin scattering
B)Chromatic modal dispersion
C)Four-wave mixing
D)Polarization mode dispersion

💡 Explanation

Stimulated Brillouin scattering (SBS) amplifies backward-propagating waves at a threshold power because acoustic phonons mediate the interaction, causing energy to transfer from the signal; therefore signal fades, rather than experiencing dispersion from other effects.

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