Contents I. Introduction
Stimulated brillouin fiber optical gyroscope (B-FOG) is the third generation fiber optical gyroscope, which is by using two opposite direction brillouin scattering light in the fiber ring laser stimulated by high output power pump light. Because the rotation angular velocity gained from the beat frequency of two opposite direction brillouin scattering light, brillouin fiber optical gyroscope has a much simpler principle structure, smaller volum, and the signal processing system is greatly simplified[1] [2]. Compared with interferometric fiber optic gyroscope, the fiber length of brillouin fiber optical gyroscope is two orders of magnitude lower than that of interferometric fiber optic gyroscope, not only reduces costs, but also significantly reduces the influencen of temperature. Compared with resonant fiber optic gyro, the amount of couplers and modulators of structural components is almost simplify half than the minimum structure of resonator fiber optic gyro. Stimulated brillouin fiber optic gyroscope has a high measurement accuracy in theoretical, and the linearity of scale factor is the best of three kinds fiber optic gyroscope, it has tremendous potential in miniaturization and become the development direction of a new generation with high-precision, small volume[3] [4] [5]. In this paper, the optical system model of brillouin fiber optic gyroscope is established, and the main components of light path system are simulation analyzed, it provide a theoretical basis for the design and realization of brillouin fiber optic gyroscope.
