title: S-band depressed-cladding erbium-doped fiber amplifier with double-pass configuration.
abstract: A new S-band erbium-doped fiber amplifier module with a double-pass configuration based on two circulators has been designed and constructed. The bending losses of a depressed-cladding doped fiber have been exploited to suppress the amplified spontaneous emission in the C band. The experimental characterization of the double-pass amplifier has shown that significant advantages can be obtained with respect to the single-pass configuration.
authors.affiliation: Dipartimento di Ingegneria dell'Informazione, Università di Parma, Viale G.P. Usberti 181/A, 43100 Parma, Italy.
authors.forename: Matteo
authors.initials: M
authors.lastname: Foroni
authors.forename: Federica
authors.initials: F
authors.lastname: Poli
authors.forename: Annamaria
authors.initials: A
authors.lastname: Cucinotta
authors.forename: Stefano
authors.initials: S
authors.lastname: Selleri