Abstract The residual linear birefringence inside the sensing coil is one of the main factors causing polarization error and accuracy decline of a fiber optic current sensor. To relieve the residual linear birefringence in fiber optic current sensors, a chiral photonic crystal fiber was utilized as the sensing coil, whose air filling ratio, lattice constant and chiral parameter were designed according to the analysis of the circular polarization degree affected by the diameter variation of the innermost air holes. The simulations demonstrated that there is a better circular-polarization-maintaining performance for the chiral photonic crystal fiber than that for the screwed silicon-based fiber. As the sensing coils, it is by an order of magnitude that the accuracy of current measurement is improved in the fiber optic current sensor.

中文翻译：

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一种减小光纤电流传感器偏振误差的手性光子晶体光纤传感线圈

摘要 传感线圈内部残留的线性双折射是造成光纤电流传感器偏振误差和精度下降的主要因素之一。为解决光纤电流传感器中残留的线性双折射问题，采用手性光子晶体光纤作为传感线圈，通过分析直径变化对圆偏振度的影响，设计了其空气填充率、晶格常数和手性参数。最里面的气孔。模拟结果表明，手性光子晶体光纤比螺旋硅基光纤具有更好的圆偏振保持性能。作为传感线圈，光纤电流传感器的电流测量精度提高了一个数量级。