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

Georgiana Vasile 1  and Niculae Puscas 1
  • 1 Physics Department I, University “Politehnica” of Bucharest, Splaiul Independentei 313, 060042, Bucharest, Romania


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-Pérot interferometry method, we evaluated the attenuation coefficient of an optical waveguide resonator for a laser radiation having λ = 1.55 µm. We also evaluated the insertion losses, polarization dependent losses, and coupling with external losses. Additionally, from the transmitted spectra of the symmetrical monomode Fabry-Pérot optical waveguide resonator, we were able to evaluate the value of the group effective refractive index.

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