title: Polarization pulling in Raman assisted fiber optical parametric amplifiers.
abstract: We proposed a theoretical model to investigate the polarization pulling effect in bi-directionally pumped degenerate Raman assisted fiber optical parameter amplifiers (RA-FOPAs) using randomly birefringent fibers. The contributions of chromatic dispersion, polarization mode dispersion (PMD), Raman gain, and nonlinear effects to the phase matching in RA-FOPAs are investigated. We characterize four different states of polarization pulling in RA-FOPAs. We found that broadband polarization attraction can be obtained in the optimum phase-matching state of the bi-directionally pumped RA-FOPAs when the parametric pump power is chosen to avoid deep saturation of the Raman gain.
authors.forename: S H
authors.initials: SH
authors.lastname: Wang
authors.forename: Xinchuan
authors.initials: X
authors.lastname: Xu
authors.forename: P K A
authors.initials: PK
authors.lastname: Wai