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Optical amplifiers with broad and flat gain spectrum are very important for WDM system applications. Various methods have been proposed for flattening gain spectrum of EDFA, most of which are based on passive or active filtering of the main gain peak at λ = 1.53 μm. (See, for example [1] and references in it). However, most of solutions are connected with considerable difficulties in fabrication, high cost and low reliability.
© 1995 Optical Society of America
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