title: Low-noise operation of fluoride-based erbium-doped fiber amplifiers with (4)I(11/2)-level pumping.
abstract: The low-noise operation of fluoride-based erbium-doped fiber amplifiers (EDFA's) is demonstrated with (4)I(11/2)-level pumping for what we believe to be the first time. A noise figure as low as 3.5 +/- 0.5 dB at 1550 nm is achieved by means of 970-nm pumping. It is shown that it is possible to construct fluoride-based EDFA's with a noise figure as low as that of silica-based EDFA's.
authors.forename: Y
authors.initials: Y
authors.lastname: Ohishi
authors.forename: M
authors.initials: M
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Kanamori
authors.forename: S
authors.initials: S
authors.lastname: Sudo
authors.forename: M
authors.initials: M
authors.lastname: Shimizu