title: Bismuth-doped optical fibers and fiber lasers for a spectral region of 1600-1800  nm.
abstract: Bismuth-doped optical fibers and fiber lasers operating in 1625-1775 nm range have been developed for the first time to the best of our knowledge. Now the existing bismuth-doped lasers, including the result presented in this Letter, can cover O, E, S, C, L, and U telecommunication bands. In addition, new data on the nature of the bismuth-related active center were obtained and discussed.
authors.forename: Sergei
authors.initials: S
authors.lastname: Firstov
authors.forename: Sergey
authors.initials: S
authors.lastname: Alyshev
authors.forename: Mikhail
authors.initials: M
authors.lastname: Melkumov
authors.forename: Konstantin
authors.initials: K
authors.lastname: Riumkin
authors.forename: Alexey
authors.initials: A
authors.lastname: Shubin
authors.forename: Evgeny
authors.initials: E
authors.lastname: Dianov