分析了用于光纤陀螺的Y波导相位调制器的半波电压特性及其对光纤陀螺系统特性的影响，测试了温度和光源波长变化对半波电压的影响；阐述了Y波导调制器调制相位漂移对光纤陀螺系统特性的影响，测试了温度以及相对湿度变化对Y波导调制器调制相位漂移的影响。针对实验结果提出了改进Y波导制作工艺的措施。

The halfwave voltage characteristics of Ywaveguide phase modulator used in fiber optical gyroscope(FOG), and their influence on system characteristics of FOG were analyzed. And the effects of temperature and light wavelength on the halfwave voltage were tested. The influence on FOG system of phase drift of Ywaveguide phase modulator were explained. The variations of phase drift with the changes of temperature and relative humidity were studied. Thus the measures for improving Y waveguide technology were put forward according to the experiment data.