FPGA-based gain-controlled closed-loop interferometric fiber optic gyroscope with a silicon multi-function integrated optical circuit

The interferometric fiber optic gyroscope (IFOG) based on a silicon multi-function integrated optical circuit (Si-MIOC) offers significant potential as the core sensor for the next generation of compact, high-precision, and low-cost inertial navigation systems. By leveraging the foundry-enabled silicon photonics platform, we demonstrated an integrated optic gyroscope with gain-controlled closed-loop technology on a Si-MIOC. This gyroscope outputs angular velocity in real time at 2 kHz, achieving a bias instability of 0.02422°/h, an angular random walk of 0.00135°/√h, and a nonlinearity of no more than 439 ppm. Furthermore, vehicle navigation experiments have validated the feasibility of this gyroscope for practical navigation applications. These results reveal an economical and compact path towards a reliable Si-MIOC-based IFOG.