光纤环偏振耦合分布及绕环光纤拍长测试技术

Testing Technique of Polarization-Coupling Distribution of Fiber Coil and Beat Length of Used Fiber

为了测试保偏光纤环的偏振耦合分布及绕环光纤拍长,采用白光干涉仪对光纤环进行测试。一方面,通过测试获得了光纤环的偏振耦合分布,有利于研究影响光纤环保偏能力的主要外部因素。另一方面,通过识别光纤环两端尾纤与白光干涉仪两个熔点产生的偏振耦合干涉峰,获得了沿绕环光纤两正交偏振主轴传输的光信号的光程差,进而计算出了绕环光纤的拍长。实验表明,0.13°以上的角度对轴误差均可被有效识别。证明了采用白光干涉仪通过一次测量同时测得光纤环偏振耦合分布和绕环光纤拍长的可行性。该研究为保偏光纤环偏振特性的全面表征提供了一种简单有效的方法。

The polarization-coupling distribution in fiber coil and beat length of used fiber are achieved by testing polarization-maintaining fiber coils using white light interferometry.The polarization-coupling distribution of the fiber coil is obtained through this test,which is helpful in identifying the principal external factors affecting the polarization-maintaining ability of the fiber coil.By identifying the polarization-coupling peak produced by the two fusion splice points at both ends of the fiber coil and the white light interferometer,the optical path difference of the optical signal transmitted by the two orthogonal polarization axes of the fiber coil is obtained,and the beat length of the fiber coil is calculated.The experiment shows that the angle error can be recognized effectively when the angle is 0.13°.The results show that the polarization-coupling distribution and beat length of the fiber coil can be measured simultaneously using a white light interferometer,providing a simple and effective method for characterizing the polarization characteristics of the polarization-maintaining fiber coil.