Based On Mach-zehnder Interferometer Fiber-optic Gyroscope

After 30 years development, fiber optic gyroscope has gradually replaced the traditional mechanical gyro and laser gyro. Interferometric fiber optic gyroscope (IFOG) in which the development of the most mature, but the traditional IFOG inherent structural defects can not be made to further improve its performance. So a new kind of IFOG based on Mach-Zehnder interferometric principle (MZ-IFOG) is put out, this article is the new fiber optic gyroscope for research.The principle of MZ-IFOG is analyzed and derived the relationship between the phase difference and the rotation rate first. The theoretical analysis shows that MZ-IFOG can be used to detect the rotation rate of moving objects by combining the Sagnac effect and Mach-Zehnder interference principle. Different with the traditional IFOG, MZ-IFOG use optical path separation, prior to transmission, which avoid the interferometric noises brought by the backward scattering and reflecting light and the Kerr effect noise. But at the same time the path-length difference brought by optical path separation will affect the performance of MZ-IFOG.A lot of theoretical analyses of the basis of fiber optic gyroscope system performance factors are also made. The same with the traditional IFOG, MZ-IFOG can improve its performance by increasing the light stability, the temperature stability and the spectral width, using Polarization-Maintaining Fiber and depolarization output light, increasing coil winding length of the fiber-optic gyroscopes, etc. The difference is that the path-length difference will impact the above-mentioned factors. So if more high-precision gyro to development, as far as possible, controlling path-length difference will become key.Based on the above analysis, the main components, including the laser source, fiber coil and photodetector are practically designed. And some parameters are measured. The testing MZ-IFOG system verification platform is constructed and the principle of MZ-IFOG is testified by the experiment. MZ -IFOG system can work.Finally, this paper points out the next step and direction to improve the performance of MZ-IFOG, which can provide some academic warranty.