D-scan measurement of nonlinear refractive index in fibers heavily doped with $\mathrm{Ge}{\mathrm{O}}_2$

Abstract

Concentration dependence of nonlinear refractive index $n_2$ in fibers heavily doped with $\mathrm{Ge}{\mathrm{O}}_2$ is studied by using the D-scan method. Good agreement with an empirical dependence established earlier with lower $\mathrm{Ge}{\mathrm{O}}_2$ concentrations by the cw dual-frequency beat signal technique is shown for $\mathrm{Ge}{\mathrm{O}}_2$ concentrations up to $\sim 100\mathrm{mol.}\%$. The highest values of the nonlinear coefficient γ at $1.25\mu \mathrm{m}$ of 47.9, 57.7, and $70.9{\mathrm{W}}^{-1}{\mathrm{km}}^{-1}$ were obtained in fibers doped with 67, 75, and $97\mathrm{mol.}\%$ $\mathrm{Ge}{\mathrm{O}}_2$, respectively.

© 2007 Optical Society of America

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