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本文介绍了采用横向Bi_(12)SiO_(20)(BSO)调制的光纤电压传感器。该传感器的灵敏度取决于BSO晶体的形状和起偏器及检偏器的偏振态。设计的晶体形状应能减小光纤的插入损耗。通过一种计算灵敏度的估算法使最佳化的起偏器和检偏器达到了最大的灵敏度。我们发现最好的方法是调整起偏器作圆偏振并将检偏器对准电极法线与旋光率所成夹角的平分线,使检偏器作线性偏振。为了使插损最小,我们采用了由TiO_2单晶(金红石)片和1/4波长片组成的起偏器,以及由金红石片和1/2波长片组成的检偏器。采用这些元件,在0.85μm波长时,我们获得了0.28％/V的灵敏度。
This paper introduces a fiber voltage sensor with lateral Bi_ (12) SiO_ (20) (BSO) modulation. The sensitivity of this sensor depends on the shape of the BSO crystal and the polarization state of the polarizer and the analyzer. The design of the crystal shape should be able to reduce the optical fiber insertion loss. Optimal polarizers and analyzers achieve maximum sensitivity with a computational sensitivity estimation method. We found that the best method is to adjust the polarizer for circular polarization and align the analyzer with the bisector of the included angle between the normal of the electrode and the optical rotation to linearly polarize the analyzer. To minimize insertion loss, we used a polarizer consisting of a single crystal of TiO 2 and a quarter-wave plate, and an analyzer consisting of a rutile and a half-wave plate. Using these components, we achieved a sensitivity of 0.28% / V at a wavelength of 0.85 μm.