A New Simplex Method Based Strategy for Automatic Multiple DOF Laser-Fiber Packaging Alignment

This paper focused on a fine alignment process for automatic multiple degree-of-freedom (DOF) laser-fiber packaging. Among the alignment algorithms used, the King´s modified simplex method (KMSM) has been proven to be very suitable for the fine alignment process because of its fast convergence and ease of implementation. However, direct implementation of this method on a multiple DOF alignment process would lead to local peak trapping problem. In this paper, a KMSM based algorithm is proposed in which the search of the global peak is divided into two stages, namely, 2D alignment and 3D optic axis alignment. The method for the selection of key parameters to prevent the simplex from sticking on the local peaks and to accelerate the search is proposed. The experimental works have proven that the proposed idea is more effective than the conventional KMSM in terms of the rates of success and convergence in all the 100 alignment trials for 10 different LD-fiber pairs, regardless of the initial positions