光学学报, 2019, 39 (4): 0406004, 网络出版: 2019-05-10
基于无源相位调制器的光纤电流互感器设计 下载: 1155次
Design of Fiber-Optic Current Transformer Based on Passive Phase Modulator
光纤光学 光纤电流互感器 温度补偿 Sagnac干涉仪 相位调制器 fiber optics fiber-optic current transformer temperature compensation Sagnac interferometer phase modulator
摘要
基于1/4波片相位延迟功能,结合起偏器与法拉第旋光器,提出了一种集起偏与相位偏置功能于一体的用于Sagnac环路中的非互易相位调制器设计方案。所提结构从根本上消除了延迟线圈对系统灵敏度的影响,降低了系统复杂度,减小了体积。实验测得该相位调制器的相对插入损耗为3.6 dB,相位偏置角度为89.9605°,实验结果能够很好地与理论分析结果吻合。提出了变比误差自补偿技术,分析得到:当温度在-40~40 ℃范围内变化时,不同制作工艺下系统的最低变比误差不超过±0.02%。
Abstract
Based on the phase delay function of a quarter-wave plate and combined with a polarizer and a Faraday rotator, a nonreciprocal phase modulator is proposed for the Sagnac loop, which integrates the functions of polarization and phase delay. The proposed structure fundamentally eliminates the influence of delay coil on system sensitivity, and reduces the complexity and volume of the whole system. The measured relative insertion loss of this phase modulator is 3.6 dB, and the relative phase offset angle is 89.9605°. The experimental results are well consistent with the theoretical analysis results. A variable ratio error self-compensation technology is proposed. In the range of -40~40 ℃, according to the different fabrication process, the minimum variation ratio error of the system is no more than ±0.02% when the temperature changes.
齐跃峰, 冯麒, 张瑾, 张鑫, 王明君, 田东升, 李卫. 基于无源相位调制器的光纤电流互感器设计[J]. 光学学报, 2019, 39(4): 0406004. Yuefeng Qi, Qi Feng, Jin Zhang, Xin Zhang, Mingjun Wang, Dongsheng Tian, Wei Li. Design of Fiber-Optic Current Transformer Based on Passive Phase Modulator[J]. Acta Optica Sinica, 2019, 39(4): 0406004.