Which mechanism causes signal attenuation in a long fiber optic cable run at elevated temperatures?

💡 Explanation

When a fiber optic cable's temperature increases, density fluctuations within the glass increase, leading to enhanced Rayleigh scattering which deflects light waves and attenuates the signal because the scattering becomes more significant. Therefore, increased Rayleigh scattering predominates, rather than index change, Raman scattering or increased absorption which are secondary effects.

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