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1 2023

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Mitigating the bending losses of the silica-titania-based rib waveguide structure

Shahbaz Muhammad, Kozłowski Łukasz, Butt Muhammad A., Piramidowicz Ryszard

Opto-Electronics Review

2023

Vol. 31, No. 1

art. no. e145551

Optical waveguides (WGs) are widely used as interconnects in integrated optical circuits both for telecommunication and sensing applications. There are different kind of optical WG designs that offers different guiding parameters, opening a vast number of possibilities. A silica-titania (SiO₂:TiO₂) rib WG is discussed and examined by a numerical analysis in this article with a great emphasis on the analysis of bending losses and optimization. A modal analysis for different basic parameters of the WG is presented with a detailed wavelengthbased modal analysis. Various potential fabrication methods are discussed, however, a solgel method and dip-coating deposition technique are proposed for the low-cost development of such WGs. Moreover, an approach towards minimizing the bending losses by adding an upper cladding layer on the rib WG is presented and described.