A device which introduces gain into a signal passing through it. In fiber optics amplifiers can be made with active fiber (usually rare-earth metal doped) which is pumped at a wavelength shorter than the signal light, which introduces energy into the system that is then passed onto the signal causing gain.


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Related Terms: Absorption, Active Medium, Amplified Spontaneous Emission, Amplifier, Emission Measurement, Emission Spectra, Erbium Doped Fiber (EDF), Erbium Doped Fiber Amplifier (EDFA), Erbium, Gain Coefficient, Rare-Earth Metal, Spontaneous Emission, Stimulated Emission, Ytterbium