为提高光纤电流传感器的标度因数稳定性，从传感光纤与光纤1/4波片熔接时的方位角出发，研究了方位角的优化对光纤内线性双折射变化的抑制作用，指出了现有方位角优化方法中忽略的因素旋光角，并结合旋光角这一变量建立了更加精确的琼斯矩阵模型。仿真分析了在不同方位角与旋光角条件下，线性双折射对标度因数稳定性的影响。通过仿真结果的对比发现，在考虑旋光角之后，现有算法的方位角优化值误差较大；还发现在特定的旋光角条件下，线性双折射的变化对标度因数无影响。基于此提出了方位角与旋光角的综合优化方法，降低了对光纤制造工艺的要求，有效提高了系统标度因数的稳定性。

To improve the scale factor stability of fiber optic current sensors, effects of azimuth which is the fiber welding azimuth between a sensing fiber and a fiber quarter-wave plate are studied, so as to restrain the linear birefringence by optimizing the azimuth. Effects of optical rotatory angle which are ignored by existing azimuth optimization theory are considered and a more accurate Jones matrix model is proposed with this new variable. It is theoretically shown that the present optimization theory has some errors with the consideration of optical rotatory angle when analyzing the simulation results. The scale factor is immune to the variable linear birefringence with some optical rotatory angles. The combined optimization of the azimuth and optical rotatory angles is proposed. It can reduce the technical requirements of fibers and effectively enhance the stability of scale factors.