Panda Fiber Axis Alignment Method Based on Light Intensity Distribution in First-Order Laser Rainbow Region

Abstract

The invention discloses a panda optical fiber axis fixing method based on the light intensity distribution in the first-order laser rainbow region. Its implementation steps: (1) irradiate the laser beam vertically to the panda optical fiber to form a strong light scattering distribution in the first-order rainbow area; (2) collect the light intensity distribution in the first-order rainbow area with CCD, perform filtering and normalization processing (3) Numerically simulate the first-order rainbow light intensity distribution of the uniform single-mode fiber; (4) combine the filtered and normalized light intensity distribution data on both sides of the Panda fiber with the numerically simulated uniform single-mode fiber light intensity distribution data Carry out the cross-correlation operation to obtain the cross-correlation coefficient; (5) rotate the panda fiber to obtain the corresponding relationship curve between the left and right sides of the panda fiber azimuth and the cross-correlation coefficient; (6) find out the symmetry axis of the two cross-correlation coefficient curves , as the azimuth of the panda fiber slow axis. The invention has the advantages of no need to establish a standard curve and fast axis fixing speed, and can be used for detecting and aligning the azimuth angle of the polarization axis of the panda optical fiber.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a method for fixing the axis of a panda optical fiber with light intensity distribution in a laser rainbow region, which can be used for detecting and aligning the polarizing axis azimuth of the panda optical fiber. Background technique [0002] Polarization maintaining fiber has been widely used in emerging fields such as interference sensing such as fiber optic gyroscope, distributed fiber optic sensing and coherent optical communication due to its strong polarization maintaining ability for linearly polarized light and excellent compatibility with general single-mode fiber. . Panda-type single-mode polarization-maintaining fiber is a commonly used high-stress birefringent polarization-maintaining fiber. On its cross-section, there are two mutually orthogonal directions with the maximum and minimum stress values, namely the directions of the two polarization axes. ,...

AI Technical Summary

Problems solved by technology

In the image processing process of this method, a moving window needs to be set. Every time the optical fiber is rotated, the moving window needs to be moved from one end of the diffraction image to the other end, and a cross-correlation operation is performed every time a pixel is moved, and the processing process takes a long time. In addition, this method needs to use an imaging screen to image the back diffraction image on it, and then use a CCD camera to shoot, the device structure is more complicated

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