(1) That portion of Fiber optic Attenuation resulting from the Conversion of Optical Power to heat. (2) The process by which Electromagnetic Radiation (EMR) is assimilated and converted into other forms of energy, primarily heat. Absorption takes place only on the EMR that enters a medium, and not on EMR incident on the medium but reflected AT its surface. A substance that absorbs EMR may also be a medium of refraction, diffraction, or scattering; however, these processes involve no Energy retention or transformation and are distinct from absorption.

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