rare-earth-doped fiber amplifier

rare-earth-doped fiber amplifier

[¦rār ‚ərth ‚dōpt ‚fī·bər ′am·plə‚fī·ər]
(communications)
An optical fiber amplifier whose fiber core is lightly doped with trivalent rare-earth ions, which absorb light at certain pump wavelengths and emit it at some signal wavelength through stimulated emission.
References in periodicals archive ?
Rare-earth-doped fiber amplifiers amplify light while it is actually traveling in the fiber, which provides greater reliability, higher signal quality and increased cost-effectiveness than traditional SONET regenerators, which must receive the signal, electrically amplify it, and then retransmit it.