基于背向切割方法,建立了测量高双折射光纤拍长的实验系统;采用最小二乘拟合法进行数据处理,放宽了对切割长度的限制,扩大了拍长的测量范围,使其能较好地适用于高双折射多孔光纤的拍长测量。 Based on the back-cutting method, an experimental system for measuring the beat length of high-birefringence optical fiber was established. The data processing was performed by the least square fitting method, which relaxed the limit of cutting length and extended the measurement range of beat length. Suitable for measuring birefringence of highly birefringent porous optical fibers.