Study on the influence of average wavelength on the scale factor stability of interferometric fiber optic gyroscope

• Yishi Liu, jingtao yan, Yushan Tan, and Xingfan Chen
• received 02/28/2024; accepted 04/25/2024; posted 05/03/2024; Doc. ID 522560
• Abstract: The introduction of closed-loop mechanisms has significantly enhanced theperformance of interferometric fiber optic gyroscopes (IFOGs). However, the poor scale factor(SF) stability limits its further application due to the use of broadband light sources. This studyfirst reviewed the impact of the average wavelength of a light source on SF stability in a closedloop IFOG setup. A simulation model is developed according to modulation and demodulationprinciples, and the SF error is found to be proportional to the wavelength drift in a closed-loopIFOG. Additionally, employing a laser with a more stable average wavelength instead of asuper fluorescent fiber source (SFS) for driving the IFOG enhanced the SF stability by an orderof magnitude to 0.38 ppm in ambient-air experiments, which is one of the best SF performancesachieved so far. With the significant improvement in stability during the variable temperaturetests, the IFOG measures rotation rates more accurately.