We demonstrate distributed measurement of the polarization beat length along single-mode optical fibers (SMFs) using slope-assisted Brillouin optical correlation-domain reflectometry (BOCDR) with high spatial resolution, long measurement range, high sampling rate, and single-end accessibility. The beat lengths of SMFs wound on mandrels with radii of 10.5, 7.5, and 3.4 cm are measured to be 36.0, 18.2, and 3.7 m, respectively, which agree well with theoretical calculations. This indicates that a unique beyond-nominal-resolution effect of slope-assisted BOCDR does not influence the measurement. Subsequently, distributed beat length measurement is demonstrated using an SMF comprising two sections wound on mandrels with different radii (10.5 and 3.4 cm).

我们演示了使用具有高空间分辨率，长测量范围，高采样率和单端可访问性的斜率辅助布里渊光学相关域反射仪（BOCDR）沿单模光纤（SMF）进行偏振拍长的分布式测量。半径为10.5、7.5和3.4 cm的心轴上缠绕的SMF的节拍长度分别为36.0、18.2和3.7 m，这与理论计算非常吻合。这表明斜率辅助BOCDR的独特的超出标称分辨率的效果不会影响测量。随后，使用SMF演示了分布式拍频长度测量，该SMF包括两个部分，分别缠绕在具有不同半径（10.5和3.4厘米）的心轴上。