7 February 2007 A novel approach for the analysis of Ti-PE: LiNbO3 distributed parameter waveguides
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Abstract
Proton exchange is becoming widely accepted as a complementary technique to titanium indiffusion for the fabrication of integrated optical waveguides in LiNbO3. In this paper, we propose, for the first time to our knowledge, a novel approach to analyze the optical distributed waveguides formed by local index variation, combining two processes, titanium indiffusion (Ti), and a localized patterned proton exchange (PE), yielding to the Ti-PE: LiNbO3 distributed parameter waveguides. We present a straightforward extension of the Wentzel Kramers and Brillouin (WKB) technique covering the computation of a single diffusion's effective index, to multiple successive diffusions having a specific graded-index profile. The efficiency of the method is shown by varying some of its parameters, like the index modulation or the proton exchanged depth, for example. The simulation's result proves that the evolution of the reflectivity's spectrum has been found to be in a good agreement with prediction.
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Georges Bou Abboud, Badr-Eddine Benkelfat, Nicolas Grossard, "A novel approach for the analysis of Ti-PE: LiNbO3 distributed parameter waveguides", Proc. SPIE 6468, Physics and Simulation of Optoelectronic Devices XV, 646809 (7 February 2007); doi: 10.1117/12.699234; https://doi.org/10.1117/12.699234
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