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← ScienceWhich 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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