Scale factor, as an important indicator for evaluating the dynamic performance of high-precision fiber optic gyroscopes (FOG), shows high sensitivity to the environmental temperature. Research on the temperature dependency of scale factor is meaningful to improve the robust performance and reliability of high-precision FOG. We theoretically analyze the sensitive factors, which could cause the scale factor error, and propose an effective method to compensate the scale factor via the temperature dependency of Er-doped superfluorescent fiber source. The experimental results show that, with our method, scale factor error can be reduced from 1185 to 640 ppm over 100°C temperature range (−40°C to 60°C).
Improvement in the mean wavelength vibration stability is crucial to the realization of a high-precision fiber-optic gyroscope. We design a vibration-resistant Er-doped superfluorescent fiber source (VR-EDSFS) incorporated with a Faraday rotator mirror and compare it with the conventional Er-doped superfluorescent fiber source (ED-SFS) under different vibration conditions. As shown by experimental results, the mean wavelength vibration stability of the VR-EDSFS is much better than that of the conventional ED-SFS. Under the 1000 to 2000 Hz vibration condition, the former is just 3.4 ppm, which is about 7 ppm less than the latter over 2 h.