3-Axes precision alignment of optical fibers with eye-to-hand calibration

Optical fiber alignment plays an important role in assembling an optical fiber-based system. Proper alignment can improve optical transmission efficiency of the spliced fiber. In this paper, a precision 3-axes alignment method for optical fiber based on telecentric lens is introduced. First, a brief introduction of the stereo vision system especially for the telecentric lens is put forward. The linear least-square method is employed to recover the optical fibers after getting the projected points in both images. Then, a novel eye-to-hand calibration for this micro vision system without any pattern board is proposed. The rotational matrix between the robot and world coordinate is obtained. Finally, a step-by-step controlling algorithm is employed to align two optical fibers. The 3-axes alignment experiments show that this method converges quickly and runs efficiently.