- This work compares three experimental methods for determining the rotation angle and position of polarization-maintaining fibers for use in integrated fiber arrays: detection of the front-face panda structure, polarization measurements of the light guided by the fiber, and imaging the panda structures via the lateral view of the fiber. Position and rotational angle of the PM fiber are detected via image recognition algorithms. Achieved positional accuracies lie in the sub-micrometer range, rotational accuracies in the range of 0.01 rad corresponding to a polarization extinction ratio of > 40 dB.
