Suppression of Kerr-effect induced error in resonant fiber optic gyro by a resonator with spun fiber.

In order to suppress Kerr-effect induced error in resonant fiber optic gyro (RFOG), a resonator based on spun fiber (SF) is proposed for the first time. The theory of the Kerr-effect induced error in gyro is analyzed first and the suppression method for this issue is explained, highlighting the advantages of circular state of polarization (CSOP) light and SF. Then the structure design and optimization of the resonator are completed to guide resonator fabrication and meet the better noise suppression requirement. Finally, the gyro experiment indicates that the resonator based on SF can suppress the Kerr-effect induced error by at least 96.6 % without a power compensation structure, which is of great significance for simplifying the system. In addition, the method proposed in this article first confirms the potential of CSOP light in optical noise and error suppression of RFOG.