title: D-scan measurement of nonlinear refractive index in fibers heavily doped with GeO2.
abstract: Concentration dependence of nonlinear refractive index n2 in fibers heavily doped with GeO2 is studied by using the D-scan method. Good agreement with an empirical dependence established earlier with lower GeO2 concentrations by the cw dual-frequency beat signal technique is shown for GeO2 concentrations up to approximately 100 mol.%. The highest values of the nonlinear coefficient gamma at 1.25 microm of 47.9, 57.7, and 70.9 W(-1) km(-1) were obtained in fibers doped with 67, 75, and 97 mol.% GeO2, respectively.
authors.affiliation: Fiber Optics Research Center of the Russian Academy of Sciences, 38 Vavilov Street, 119991 Moscow, Russia. yuriya@fo.gpi.ru
authors.forename: Yuri
authors.initials: Y
authors.lastname: Yatsenko
authors.forename: Alexei
authors.initials: A
authors.lastname: Mavritsky