The propagation velocities of the two orthogonally polarised modes in a "polarisation-maintaining" fiber are changed when exposed to external fields resulting in phase difference.
保偏光纤中两正交偏振模受外场作用，其传播速度发生变化，形成相位差。
The propagation velocities of the two orthogonally polarised modes in a "polarisation-maintaining" fiber are changed when exposed to external fields resulting in phase difference.
保偏光纤中两正交偏振模受外场作用，其传播速度发生变化，形成相位差。
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