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.
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