An EDFA, or Erbium-Doped Fiber Amplifier, is an optical amplifier that uses a small amount of erbium ions doped into a fiber optic medium to amplify light signals. This technology is crucial for boosting the strength of optical signals in fiber optic communication systems, particularly in wavelength division multiplexing (WDM) applications, allowing multiple signals to be transmitted simultaneously over the same fiber without significant loss of quality.
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