Fiber loss is also known as fiber optic attenuation or attenuation loss. Attenuation loss is measured by the amount of light lost between the input and output. A number of things can cause fiber loss and include; material absorbtion, fiber bending and connector loss.
Losses can be categorised into two basic groups. Intrinsic Loss and Extrinsic Loss. Intrinsic Loss refers to any loss that takes place due to things such as absorption loss, dispersion loss and scattering caused by the defects, Extrinsic Loss are caused by factors such as splicing loss, connector loss, and bending loss.