Light from the laser goes through the optical circulator, and is divided into the sample and reference arm by the fiber coupler.
激光器发出的光通过光环行器，被光纤耦合器分成样品臂和参考臂。
Fiber polarization controller and polarization-maintaining optical circulator with high extinction ratio were incorporated in the loop cavity to acquire single polarization output.
在环形腔内加入光纤偏振控制器和具有高消光比的保偏环行器获得单偏振光。
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