摘要
当施加于高双折射光纤上的压力的空间周期与其拍长相一致时,将引起光纤中偏振模式的相干耦合。应用上述原理,研制了测量高双折射光纤拍长的装置,给出了空间压力周期数N、压力引起光纤主轴转角θ及压力周期误差与测量精度的关系。实验结果表明此法测量范围从亚毫米至1厘米,精度达1％。
A spacially periodical stress method for measuring the beat length of a highly birefringent fiber has been demonstrated. The relationship between the number of spacially stressed ridges N,the rotation angle 8 induced by spacially periodical stress,the error of periodical length and the measuring accuracy is presented. Theoretical and experimental results show the measuring range from submillimeter to one centimeter with an accuracy of the order of 1%.
基金
国家自然科学基金资助
资助号:68870100
关键词
光学纤维
双折射
拍长
测量
highly birefringent fiber
beat length measurement
