Evaluation of losses and group effective refractive index of Er3+:Ti:LiNbO3 optical waveguides

In this paper, we report some experimental results concerning several types of loss measurements of Er3+:Ti:LiNbO3 optical waveguides by using optical methods. Using the Fabry-P,rot interferometry method, we evaluated the attenuation coefficient of an optical waveguide resonator for a laser radiation having lambda = 1.55 A mu m. We also evaluated the insertion losses, polarization dependent losses, and coupling with external losses. Additionally, from the transmitted spectra of the symmetrical monomode Fabry-P,rot optical waveguide resonator, we were able to evaluate the value of the group effective refractive index.