An Integrated Optic Gyroscope Based on a 12.5-m Silica Waveguide Coil

This study presents the development of an integrated optic gyroscope (IOG) utilizing a long waveguide coil. The coil is fabricated on a quartz-based silica platform and follows an Archimedean spiral layout to ensure optimal extension. A symmetrical upper and lower cladding structure is employed to minimize optical loss. Based on this design, a waveguide coil approximately 12.5 m in length was fabricated, exhibiting a transmission loss as low as 0.54 dB/m. An IOG test system incorporating the 12.5-m waveguide coil was established, achieving a bias instability of 6.52°/h. To the best of our knowledge, this represents one of the best performances reported for optic gyroscopes based on waveguide coils. The integration of on-chip optical waveguides, in place of traditional optic fiber coils, marks a significant step toward the full integration of optic gyroscope systems.