掺铒光纤放大器
掺铒光纤放大器(Erbium-doped fiber amplifier,簡稱EDFA),在單模石英光纖中摻入微量的铒離子,注入泵浦光使三價铒離子的亞穩態能級2I13/2與基態2I15/2能級發生电子居量反轉(population inversion),從而在1550nm[1]的信號光通過時發生受激輻射將信號光放大的器件[2]。它的面世从根本上改变了光纤通信发展的格局[3][4]。
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