从理论和实验两个方面分析并验证了白光偏振耦合分布式保偏光纤传感器探测灵敏度与光纤双折射色散的关系。提出了一种色散补偿耦合强度的计算方法。该方法在忽略光传输中微弱损耗情况下,利用耦合点干涉包络面积在存在双折射色散情况下仍然保持不变这一特性,通过对干涉包络进行希尔伯特(Hilbert)包络提取和最小二乘非线性拟合得到干涉包络的面积,从而获得经过色散补偿后的偏振耦合强度值。实验结果表明,该色散补偿算法具有很高的准确性,尤其对短光纤,绝对偏差小于0.63 dB。 The relationship between the detection sensitivity and the birefringence dispersion of the fiber is analyzed and verified from the theoretical and experimental aspects. A calculation method of dispersion compensation coupling strength is proposed. The method ignores the weak loss in optical transmission and utilizes the characteristic that the interference envelope area of ​​the coupling point remains unchanged in the presence of birefringence dispersion. By using the Hilbert envelope extraction of the interference envelope, And the least squares nonlinear fitting to obtain the area of ​​the interference envelope, so as to obtain the dispersion-compensated polarization coupling strength value. The experimental results show that the dispersion compensation algorithm has high accuracy, especially for short fibers, the absolute deviation is less than 0.63 dB.