Technical Physics
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- 2023
- 2022
Mode transformation in hybrid waveguides based on lithium niobate for efficient coupling to a standard single mode fiber
Parfenov M. V.
1,2, Agruzov P. M.
1, Ilichev I. V.
1, Usikova A. A.
1, Shamrai A. V.
1
1Ioffe Institute, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
Email: mvparfenov@mail.ioffe.ru
Topology of a hybrid waveguide device, which performs an effective transformation of a standard gradient titanium in-diffused waveguide mode to a hybrid waveguide mode, is considered. With its help a rather large optical mode with size optimal for coupling with standard single-mode fibers can be converted to a mode with a smaller size. Two the most perspective materials for hybrid waveguide fabrication were considered: silicon and titanium dioxide. The theoretical analysis has shown that transformation efficiency of more than 99% is achievable for waveguide devices based on titanium dioxide with contact lithography resolution. Keywords: integrated optics, waveguide, lithium niobate, optical mode, taper, silicon, titanium dioxide
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