Back-Reflection Model in Resonator Fiber-Optic Gyro

Back-reflection is one of the most important noise sources in the resonator fiber-optic gyro (R-FOG). According to the optical overlapping Held method, the reflection model is set up, where the two reflection dots are outside the resonator. The resonance characteristics caused by the back-reflection noise in the R-FOG are formulated theoretically. After the numerical analysis by Matlab, the relationship between the drift caused by the back-reflection noise and the parameters about resonator´s structure and reflection noise is derived. Compared with the shot-noise-limited sensitivity of the same R-FOG system, it is confirmed that the back-reflection error is to be overcome in order to enhance the detecting precision of the R-FOG in theory.