Research on radiation damage of fiber optical fiber ring for fiber optic gyroscope

With the development of space technology, more and more Fiber optic gyroscope is used in spacecraft and satellite. Due to the existence of space radiation environment, it will cause serious damage to some components in the Fiber optic gyroscope, especially the fiber ring, and have an important impact on the optical power transmission of the fiber ring. In recent years, the research shows that space irradiation has serious damage to optical elements. In this paper, for a 1550 nm Panda optical fiber, the influence of the radiation damage of this kind of optical fiber is obtained by gamma ray and electron source irradiation respectively. The transmission loss of the fiber is up to 17.5 dB/km after 1Mrad (Si) is irradiated by gamma ray, and 53.2 dB/km after 5×1015/cm² electrons is irradiated by 0.2MeV electron source. Compared with the previous 1310 nm optical fiber irradiation damage, and through the analysis of the mechanism of optical fiber irradiation damage, it is concluded that the impact of 1550 nm optical fiber irradiation damage is greater than that of 1310 nm optical fiber irradiation damage. In addition, for the degradation of 1550 nm optical fiber, the influence of fiber radiation damage on the bias drift and random walk of the whole fiber optic gyroscope system is analyzed. Finally, based on the radiation damage mechanism of optical fiber and the experimental results of radiation damage of optical fiber, some suggestions on the radiation resistance design of optical fiber ring are given.