一种利用定向耦合调制器的循环干涉型光学陀螺改进方案

循环干涉型光学陀螺的损耗随着循环次数的增加而增大，并且耦合器对于光强的分配起着至关重要的作用，文中提出了一种利用定向耦合调制器代替普通耦合器的改进方案，利用定向耦合器可以通过调整工作电压获得交叉态与直通态的特性，改变光脉冲信号进入光路时及光循环经过耦合器时的耦合态，以此来增大信号光耦合进光路的光强，并减少因循环所导致的额外损耗。仿真表明，文中提出的方法可以明显增大检测到的光强，提高光信号的信噪比，从而提高检测精度。

An improved circulating interferometric optical gyro design method by using directional coupler modulator

The attenuation of light signal in circulating interferometric optical gyro increases with the increase of cycling loops due to the use of coupler. In this paper, an improved design method of circulating interferometric optical gyro was proposed by using directional coupling modulator to replace the ordinary coupler. The cross state and direct state in the directional coupler could be obtained by adjusting the working voltage. The coupling mode could be controlled to be different when the light pulse signal went into the cycling light path or the light cycles out of the coupler. The light signal amplitude in the cycling light path could then be improved, and the attenuation caused by coupler was reduced. Simulation results show that the proposed method can increase the detected light intensity and improve the signal to noise ratio, which will improve the measuring precision effectively.