提出了一种可用于光学相位调制的干涉仪型光纤陀螺的解调方案，它把光电探测器输出的电流信号与一个方波信号叠加并利用闭环电子线路调节脉冲的间隔来测量光学相移．光学相移的测量误差小于７×１０－ｒａｄ，该误差还可通过查表予以校正．利用此方案研制出的开环光纤陀螺的试验结果表明；有很好的线性度并与理论分析很一致． A demodulation scheme of interferometer fiber optic gyro which can be used for optical phase modulation is proposed. The optical phase shift is measured by superimposing the current signal output by the photodetector with a square wave signal and adjusting the pulse interval by a closed loop electronic circuit. Optical phase shift measurement error is less than 7 × 10-rad, the error can also be corrected by looking-up table. The experimental results of the open-loop fiber optic gyroscope developed by using this scheme show that it has good linearity and is consistent with the theoretical analysis.