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The Erbium-Doped Planar Amplifier: from Laboratory to Local Loop

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Abstract

The erbium-doped fibre amplifier (EDFA) was invented at the University of Southampton in 1987 [1], and rapidly recognised as a very significant advance. The first commercial EDFAs were available only four years later, making possible fully transparent transoceanic cables with unprecedented bandwidth and expanding the scope of land-based optical networks. Despite their unsurpassed performance, however, EDFAs remain expensive components whose cost must usually be shared among hundreds or even thousands of customers in order to make their use economically viable. They are thus to be found as head-end power amplifiers or booster amplifiers in trunk lines and submarine cables, but not in applications in the local loop.

© 1995 Optical Society of America

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