We study the fast state of polarization (SOP) rotation of lightwaves propagating in the fiber of optical ground wire under lightning-induced events because of the Faraday effect. Theoretical descriptions have been completed previously based on an instantaneously established uniform magnetic field time-profile. Here we describe more accurately the SOP rotation time-profile, using the retarded field model, taking into account the finiteness of the speed of light both in vacuum and in fiber. An expression for SOP rotation angle is found using the isotropic fiber approximation. Comparison of the retarded field model with the instantaneous field model is given for both sharp (pulse rise time ∼1 μs) and slow (∼10 μs) current pulses.

由于法拉第效应，我们研究了在闪电诱发事件下在光地线光纤中传播的光波的快速偏振态 (SOP) 旋转。之前已经基于瞬时建立的均匀磁场时间剖面完成了理论描述。在这里，我们使用延迟场模型更准确地描述 SOP 旋转时间曲线，同时考虑到真空和光纤中光速的有限性。使用各向同性光纤近似可以找到 SOP 旋转角的表达式。用瞬场模型的延迟场模型的比较，给出了两个尖锐（脉冲上升时间〜1 μ S）和缓慢（〜10 μ S）的电流脉冲。