The correlation coefficient method for alignment of polarization maintaining fiber

The paper introduces the aligned method of polarization maintaining fiber (PMF) combined the characteristic value methods with the correlation coefficient method. This method is based on side-view of fiber. The PMF is irradiated by parallel ray from lateral side and the observation plane where set a camera is on the other side. The side-view of PMF from the camera is intercepted to get the light-intensity distribution of fiber cross section. Because the curve of the light-intensity distribution is changed when the PMF is rotated around the fiber core, and the results of simulation and experiment shows that the correlation coefficient of the curve can be used to align PMF and the speed of alignment is improved with the correlation coefficient method.