光纤陀螺中Y波导振动特性分析

Vibration Analysis of Y Waveguide Integrated Optical Modulator in the FOG

光纤陀螺由于无运动部件,因此具有良好的抗振动、抗冲击特性,但是在实际的工程运用中,对于高精度光纤陀螺其振动误差直接影响着实际运用性能。本文分析了构成高精度光纤陀螺的关键部件Y波导的振动误差原理,并阐述了其对光纤陀螺输出信号的影响,随之提出了采用基于四状态的双闭环数字信号处理方案来跟踪和补偿Y波导振动误差的方法 ,实验结果表明该补偿方案可以很好的对由振动导致的Y波导产生的非互易性相移给予补偿。

In the absence of moving parts, FOG （fi ber-optic gyroscope） demonstrates some promising characteristics such as anti-vibration, anti-shock features. However, in practical engineering applications, the vibration errors of highprecision FOG affect its practical performance. The vibration errors of Y waveguide which is the key components of FOG is analyzed in this paper, and the effect of FOG output signal is also described here. Subsequently, four-state and double closed-loop digital signal processing program is putted forward to track and compensate for vibration errors caused by Y waveguide. Experimental results show that the compensation program compensates the non-reciprocal phase shift generated by Y waveguide very well.