Some energy is lost through absorption and scattering by the material the optical fibre is made from.
Energy is also lost if any light escapes the fibre.
The energy loss results in a reduced signal amplitude.
A signal booster can be used to reverse this effect.
A signal that travels straight down the middle of a fibre (axial ray) will take less time than one which bounces off of the sides (non axial ray).
This means parts of the signal will arrive at the end of the fibre before the rest, and so the signal is broadened which can cause a loss in quality if several signals broaden and merge together.
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