The piezoelectricpolarizationcontrollerassisted POTDR (PPCassisted POTDR) is used to measure birefringence distribution under different bend radii. When the fiber bend radius is kept invariant, the birefringence remains a random variable, so the bend radius cannot be estimated by calculating the birefringence. The bend radius can be calculated by the average birefringence when the fiber is arranged in multicircles. The bend radius is estimated by calculating the correlation coefficient of the birefringence between the undertest bend radius and standard curve radius (8 cm). This method will help us to determine the bend location and bend radius when the bend length is small enough or the bend radius is randomly distributed along the fiber.%利用压电偏振控制器辅助POTDR(PPC-assisted POTDR)测量光纤不同弯曲半径下的双折射分布.在光纤弯曲半径不变的情况下,双折射系数仍然是一个随机变量,因此通过计算双折射系数并不能估算弯曲半径,必须对光纤进行多圈弯曲,通过平均双折射系数计算弯曲半径.提出引用计算被测弯曲半径的光纤双折射系数的分布函数与标准弯曲光纤(光纤标准弯曲半径为8 cm)双折射系数分布函数的相关系数,来估算光纤的弯曲半径.这种方法有利于在光纤弯曲很复杂的情况下确定光纤的弯曲位置和弯曲半径.
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