为了提高系统的互易性及有效抑制背向散射噪声对RMOG检测精度的影响,提出一种基于光开关抑制背向散射噪声的谐振式微光学陀螺。首先分析和测试实际RMOG系统中背向散射噪声的影响;然后对顺、逆时针两路光波信号进行同频调制,并利用1×2光开关施加时分复用信号使得激光信号在顺、逆时针两个方向来回切换,在时间上分离信号光和背向散射光,用于减小背向散射噪声对RMOG检测精度的影响;分析光开关的信道串扰、切换时间对背向散射噪声的抑制作用。实验结果表明,光开关能够减小背向散射噪声,减小程度受开关串扰的制约,开关切换时间需结合光波导环形谐振腔的时间常数及环路锁定时间进行优化设计。

To improve the reciprocity of the system and effectively suppress the influence of backscattering noise on resonant micro-optical gyroscope (RMOG) detection accuracy, an optical switch-based RMOG is proposed. First, we analyze and test the influence of backscattering noise in the actual RMOG system; the same frequency modulation is performed on both clockwise and counterclockwise lightwave signals, which are time-division multiplexed using a 1×2 optical switch to alternate the laser output between clockwise and counterclockwise separating the signal and backscattered light in time and reducing the influence of backscattering noise on RMOG detection accuracy; furthermore, the channel crosstalk of the optical switch and the effect of switching time on backscattering noise are analyzed. The experimental results show that the optical switch can reduce the backscattering noise, and the degree of reduction is limited by the switch crosstalk. The switching time of the switch needs to be optimized for the time constant of the optical waveguide-ring resonator and the loop lock time.