In the R-FOG based on the phase modulation spectroscopy technique,not only the optical power difference between the clockwise(CW) and counterclockwise(CCW) light waves induces the bias drift,but also the two different modulation indexes do.

• 基于调相谱检测技术的谐振式光纤陀螺系统中,除顺时针(CW)和逆时针(CCW)光路传播的光强不均匀会引入非互易相位差,使系统出现零漂外,顺时针和逆时针光路的调制系数也会引入系统零漂。