Which mechanism causes increased signal attenuation in long fiber optic cables operating at high bit rates?

💡 Explanation

When operating at high bit rates over long distances in fiber optics, stimulated Brillouin scattering (SBS) arises because the intense optical power generates acoustic phonons which then backscatter pump light effectively reducing transmitted signal strength. Therefore SBS causes increased attenuation, rather than chromatic dispersion, refractive index issues, or connector reflections which all manifest different mechanisms.

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