Abstract
The alignment of two collimators inside DWDM involves the alignment of position and direction in 3D space, therefore five degree-of-freedom alignment device is needed. The objective is to find loss which is larger than -0.3dB. The real intensity model is identified by experiments. Based on this model, the alignment procedure is conducted in two phases, coarse and fine tuning. Coarse tuning is used to reduce loss to -30dB by scanning and fine tuning finishes the alignment to -0.3dB.Two methods in fine tuning, Basic search method and Function fitting method, which can not be used in local maximum problem. The results show the developed alignment method works successfully and the Function fitting method is better than Basic search method.