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With the rapid growth of the demand for various unmanned platforms, such as small Unmanned Aerial Vehicles (UAVs), small Autonomous Underwater Vehicles (AUVs), Unmanned Underwater Vehicles (UUVs), and driverless vehicles, the miniaturized, integrated, and large-scale production of interferometric Fiber Optic Gyroscopes (FOGs) and the fiber-optic inertial navigation have become an important research field. This paper first introduces the research status of integrated chip gyroscope, and then designs a miniaturized interferometric integrated optical gyroscope based on silicon lithium niobate thin waveguide, focusing on the structural design of silicon lithium niobate thin waveguide. The high efficiency microwave/light wave interaction problem of silicon lithium niobate thin waveguide electro-optical modulation is solved, the volume of optical modulator is significantly reduced, and the half wave voltage of optical modulator is reduced. Polarized waveguide is added to realize the function of traditional lithium niobate waveguide modulator. Finally, due to the stable chemical properties and high hardness of lithium niobate material, it is difficult to process it with conventional silicon waveguide etching process. This paper has conducted a preliminary study on its low loss processing technology. Although the silicon lithium niobate thin waveguide can significantly reduce the volume of the FOG and improve the integration of the FOG, due to the large gap between the size of the thin waveguide and the single-mode fiber core, if the direct alignment coupling is inevitable, a large coupling loss will be introduced. It is necessary to further study the low loss optical coupling technology of silicon lithium niobate to meet the requirements of miniaturized and integrated FOG.
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