Interferometric Optical Gyroscope Based on Hybrid Integrated Optical Transceiver Module

This study develops an integrated optical gyroscope that is based on a hybrid integrated optical transceiver module. An integrated optical module on the same chip simultaneously integrates the chip-level broad spectrum laser light source, photodetector (PD), and coupler through a single-mode fiber optic connection with the subsequent system. After packaging, the size of the entire module is $38.2\times 30\times 8$ mm, the output light power is 0.693 mW, the polarization extinction ratio is 0.83 dB, and the responsiveness is 0.35 A/W. The module is connected to a 460 m-long optical fiber ring to form an interferometric fiber optic gyroscope (IFOG) system, and the overall accuracy can reach 0.039°/h, thereby achieving navigation-grade precision. This work provides a scheme verification for the integration between optical chips of different materials and carries out a deeper exploration for the development of hybrid integrated optical chips for optical sensing in the future, thereby achieving an important breakthrough for the improvement of the overall integration degree of IFOG.