Abstract: In order to overcome the limitation of maximum coupling efficiency in the coupling package of optical emission sub-modules of distributed feedback laser lasers, the wedge-shaped truncated optical fiber microlens was used to replace the discrete lens in direct coupling scheme.A wedge-shaped truncated end-face model with inclined angle of 0.6rad, coupling distance of 60μm and half-width of 15μm was obtained. On this basis, compared with discrete and direct coupling, longitudinal, transverse and angular migration errors were discussed.The results show that, when longitudinal coupling distance is -21.45μm~56.79μm and angular coupling angle ranges from -8.3°~8.5°, the coupling efficiency is always greater than 70%. The overall tolerance of structure is high and the coupling efficiency is 84.40%.This research can provide a new solution of secondary emission module of coupling package device for the next generation distributed feedback lasers.