A. A. Popescu, D. Savastru, S. Miclos, Design and realization of low losses chalcogenide AsxS1-x planar waveguides, J. Optoelectron. Adv. Mater. 13/3-4 (2011) 213 – 217.

Title: Design and realization of low losses chalcogenide AsxS1-x planar waveguides

Abstract: Optical losses in planar waveguides are usually limited to several dB/cm that is a quite high value for practical application. In many cases the optical losses are due to light scattering on non-homogeneities rather than to material absorption. Numerical calculations for the waveguide modes show that the effective refractive index variations depend on the material and geometrical waveguide parameter and can be optimized in order to minimize the sensitivities. The optimized planar structure may be performed using a multilayer structure of As(x)S(1-x) glasses with different compositions. Experimentally symmetrical planar waveguides were realized with losses less than 0,1 dB/cm. The three prism method was used for measurement of the low optical losses.

Key words: Planar waveguides; Integrated optics; Chalcogenide glasses