This paper reviews recently developed ultra-broadband EDFAs which include an amplifier composed of a 1.55 μm-band and a 1.58 μm-band gain-flattened EDFA in a parallel configuration and an Er3+-doped tellurite fiber amplifier. Furthermore, it dcscribes improvements in the 1.55 μm-band gain-flattened fluoride-based EDFA.

© 1997 Optical Society of America

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