Low-noise broadband-source-driven resonant fiber optic gyroscope

The broadband-source-driven resonant fiber optic gyroscope (RFOG) is a promising candidate for achieving high precision, low cost, and miniaturization. However, its angle random walk (ARW) remains limited by relative intensity noise (RIN) and shot noise. This paper demonstrates a low-noise broadband-source-driven RFOG utilizing the optical cancellation method based on a reflection-type fiber ring resonator (FRR). The reflection-type FRR enhances sensitivity by reducing sensing unit loss, while the optical cancellation method simultaneously improves ARW limited by RIN and shot noise. In experiments, an ARW of 6.7 × 10^-4°/√h is achieved with a 107-m-long FRR. To our knowledge, this represents the best-reported ARW performance of optic gyroscopes employing fiber of similar length. This scheme features a simple structure and requires no additional signal processing, thereby advancing the development of RFOGs toward higher precision and miniaturization.