论文部分内容阅读
为了获得干涉式光纤陀螺用光纤环的分布式偏振耦合特性,采用光相干域偏振检测(OCDP)技术进行了测量。实验结果表明,利用OCDP技术可以获得光纤环偏振耦合点的空间分布和耦合强度。通过对实验结果的分析,观测到了由光纤环缺陷点引起的大偏振耦合点。根据正反向测量中由绕环中点处应力致偏振耦合点对应的扫描长度,计算得到了光纤环关于绕环中点的对称性。测试了光纤环分布式偏振耦合的温度依赖性,结果表明不同温度下光纤环偏振耦合的差异与绕环胶的固化方法有关。通过对不同温度下有骨架光纤环和无骨架光纤环的分布式偏振耦合特性分析表明:在任何温度下,无骨架光纤环都获得了沿光纤长度分布更加均匀的偏振耦合。
In order to obtain the distributed polarization coupling characteristics of an optical fiber ring for an interferometric fiber optic gyroscope, optical coherence domain polarization detection (OCDP) technique was used for the measurement. The experimental results show that the spatial distribution and the coupling strength of the polarization coupling point of the fiber ring can be obtained by OCDP technique. By analyzing the experimental results, we observed the large polarization coupling point caused by the fiber ring defect point. According to the scanning length corresponding to the stress induced polarization coupling point in the midpoint of the forward and backward measurement, the symmetry of the fiber ring about the midpoint of the winding is calculated. The temperature dependency of the distributed polarization coupling of the fiber ring was tested. The results show that the difference of the polarization coupling of the fiber ring at different temperatures is related to the curing method of the winding rubber. The analysis of the distributed polarization coupling of fiber ring with and without skeleton at different temperatures shows that at any temperature, the skeleton-free fiber ring has more uniform polarization coupling along the fiber length distribution.