Novel Butterfly Type Laser Module Packaging Employing Nd:YAG Laser and Separated Clip of Stainless Steel

摘要

The butterfly type laser module packaged employing separated clip of stainless steel and Nd:YAG laser is demonstrated in this study. The postweld shift (PWS) of fiber tip in laser module packaging is reduced by tuning the distance between separated clips. Using high-magnification camera with image capturing system (HMCICS) can accurately measure the direction and magni-tude of shift on fiber tip. The benefit of using the HMCICS technique to determine the fiber align-ment shift are quantitatively measure and compensate the PWS direction and magnitude during the laser-welded laser module packaging. This study makes it possible to probe the nonlinear behavior of the PWS by using a novel HMCICS technique that results in a real time quantitative compensa-tion of the PWS in butterfly-type laser module packages. When compared to the currently available qualitatively estimated techniques to correct the PWS, the PWS is mostly reduced and lead to the PWS compensation is negligible in the laser module packaging process. The result shows that the coupling efficiency of laser module packaged by the separated clips, with 5 mm spacing and pre-compensation between 19.5 μm to 21 μm in Y-direction, can be improved to relatively higher cou-pling efficiency. The experiment result also shows that the coupling efficiency can be improved to 78%-99% after laser welding packaging employing separated clips. In comparison to the previous clip on laser module packaging, separated clip can effectively minimize the PWS to avoid PWS compensation. Therefore, the reliable butterfly-type laser modules with high yield and high perfor-mance used in lightwave transmission systems may thus be developed and fabricated.