Polarization sensitive optical time-domain reflectometer ( P-OTDR) is widely used for measuring polarization parameters of optical fiber ( birefringence, polarization mode dispersion) and for distributed optical fiber sensing. 偏振敏感时域反射计(P-OTDR)在光纤偏振参数(双折射、偏振模色散)分布式测量,分布式传感中有着广泛的应用。