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A quantitative postweld shift (PWS) correction employing a notch-saddle-compensation technique (NSCT) in a laser-welded butterfly-type laser module package is presented. A predetermined notch geometry is proposed to guide the welding compensation in the specific direction and magnitude precisely. The results show that 82% to 99% of the relative coupling efficiency before welding for the laser modules...
The post-weld-shift (PWS) compensation techniques using a laser displacement meter in TO-Can and a high magnification camera in butterfly type laser-welded laser module packages are demonstrated. These techniques enable to real time quantitatively compensate the PWS induced fiber alignment shift in laser module packages
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