本发明的优点是：阀芯复位速度快，复位时移动距离缩短；
The invention has the advantages that the valve core can be fast reset, and has short motion distance during resetting;
偏振控制器要求有快的响应速度，大的消光比，小的波动，并能无端复位或不需复位就可进行无端偏振态控制。
It requires fast response speed, big extinction ratio, small fluctuation with endless reset or reset-free SOP control.
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