The erbium-doped fiber (EDF) is at the core of EDFA technology, The erbium-doped fiber in the erbium-doped fiber amplifier is doped with erbium element, and the erbium-ion energy is high and very unstable, and it is easy to jump to the low energy level through various ways. Under the energy transmission of the pump source, a large number of erbium-ion stacks and then realize the inversion of the particle number, creating conditions for stimulated radiation.#EDFA #optical #amplifier #fiber
