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对干涉型集成光学陀螺(IIOG)和谐振型集成光学陀螺(RIOG)进行了比较。为使两者具有可比性,两种陀螺采用相同参数的光路器件、相近的偏置调制方法以及相同面积和传输损耗的光波导萨尼亚克(Sagnac)效应敏感环。推导了采用方波调制的干涉型集成光学陀螺和采用三角波调制的谐振型集成光学陀螺的散粒噪声灵敏度的准确表达式,通过优化波导器件参数计算得到两种陀螺最优的散粒噪声灵敏度。结果表明:随着光波导传输损耗的降低,干涉型集成光学陀螺的散粒噪声灵敏度要优于谐振型集成光学陀螺。随着超低损耗光波导技术的发展,干涉型集成光学陀螺在精度提高上具有较大潜力。
The interference type integrated optical gyro (IIOG) and the resonant type integrated optical gyro (RIOG) were compared. To make the two comparable, both gyroscopes use the same parameters of optical path devices, similar bias modulation methods, and optical waveguide Sagnac effect-sensitive rings of the same area and transmission loss. The accurate expression of the shot noise sensitivity of the interferometric integrated optical gyro with square wave modulation and the resonant integrated optical gyro with the triangular wave modulation is deduced. The optimal shot noise sensitivity of the two kinds of gyros is obtained by optimizing the parameters of the waveguide device. The results show that with the decrease of the transmission loss of the optical waveguide, the shot noise of the interferometric integrated optical gyro is better than that of the resonant integrated optical gyro. With the development of ultra-low loss optical waveguide technology, interferometric integrated optical gyroscopes have great potential for improving the accuracy.