Abstract
Topology of a hybrid waveguide device, which performs aneffective transformation of a standard gradient titanium in-diffusedwaveguide mode to a hybrid waveguide mode, is considered. With its help arather large optical mode with size optimal for coupling with standardsingle-mode fibers can be converted to a mode with a smaller size. Two themost perspective materials for hybrid waveguide fabrication were considered:silicon and titanium dioxide. The theoretical analysis has shown thattransformation efficiency of more than 99% is achievable for waveguidedevices based on titanium dioxide with contact lithography resolution. Keywords: integrated optics, waveguide, lithium niobate, optical mode,taper, silicon, titanium dioxide\
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