提出一种在保偏光纤上计算光纤拍长的方法,即在保偏光纤上制作光纤光栅,利用光纤光栅的特性可以方便地求得光纤的拍长.同时,发现在保偏光纤上写入光纤光栅,其过程等效于在两个主轴上分别写入了一个光纤光栅,并且这两个光栅对于光的偏振态具有选择性,它们分别作用的偏振态是相互正交的.利用此特性,可以得到偏振消光比比较高的偏振分束器.

A method of writing fiber Bragg grating into the birefringent fiber is presented. The beat length of the birefringent fiber is easily obtained. It is found that there are actually two gratings respectively writen on the axises of the birefringent fiber. These two gratings act selectivity on the polarization states and these two polarization states are vertical to each other. A better polarization splitting device can be made by using this character.