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due to the fact erbium absorbs and emits light at 1,550 nanometres, particularly in the middle from the fibre telecom band, it can be used to amplify The sunshine in a tool identified as an Erbium-Doped Fibre Amplifier (EDFA). The undersea optical fibres that form the spine of the world wide web have EDFAs every single 80km or so. the very best me

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