These are closely related to lasers, as they do a similar basic job: take a DC source as input and amplify light. Lasers just happen to use the input voltage to also generate the incoming light.
These are pretty cool, they are basically a laser
This one was a huge advance it seems.
Video 1.
Erbium-doped fiber amplifier by Millennium Technology Prize
. Source.

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  3. Photon
  4. Elementary particle
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