title: Germania-glass-core silica-glass-cladding modified chemical-vapor deposition optical fibers: optical losses, photorefractivity, and Raman amplification.
abstract: Germania-glass-core silica-glass-cladding single-mode fibers (deltan as great as 0.143) with a minimum loss of 20 dB/km at 1.85 microm were fabricated by modified chemical-vapor deposition. The fibers exhibit strong photorefractivity, with type IIa index modulation of 2 x 10(-3). A Raman gain of 300 dB/(kmW) was determined at 1.12 microm. Only 3 m of such fibers is sufficient for constructing the 10-W Raman laser at 1.12 microm with a 13-W pump at 1.07 microm.
authors.affiliation: Fiber Optics Research Center at the A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, 38 Vavilov Street, 119991 Moscow, Russia. vmm@fo.gpi.ru
authors.forename: V M
authors.initials: VM
authors.lastname: Mashinsky
authors.forename: V B
authors.initials: VB
authors.lastname: Neustruev
authors.forename: V V
authors.initials: VV
authors.lastname: Dvoyrin
authors.forename: S A
authors.initials: SA
authors.lastname: Vasiliev
authors.forename: O I
authors.initials: OI
authors.lastname: Medvedkov
authors.forename: I A
authors.initials: IA
authors.lastname: Bufetov
authors.forename: A V
authors.initials: AV
authors.lastname: Shubin
authors.forename: E M
authors.initials: EM
authors.lastname: Dianov
authors.forename: A N
authors.initials: AN
authors.lastname: Guryanov
authors.forename: V F
authors.initials: VF
authors.lastname: Khopin
authors.forename: M Yu
authors.initials: MY
authors.lastname: Salgansky