Both transmissions were on a link with G.652 fibers and erbium-doped fiber amplifiers (EDFAs) without electrical regeneration.

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Inside its pressurized case is a miniature racetrack of the element erbium, which, when energized, gooses along the photons, like a waterwheel.

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When this beam struck a target of erbium deuteride, the team detected neutrons coming from the target with precisely the energy expected if they were generated by the nuclear fusion of two deuterium nuclei.

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