Post-weld-shift in dual-in-line laser package

Kuang, Jao-Hwa; Sheen, Maw-Tyan; Wang, Szu-Chun; Wang, Gow-Ling; Cheng, Wood-Hi

doi:10.1109/6040.909629

Cited by 41 publications

(7 citation statements)

References 8 publications

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“…Due to its good reliability, bonding strength, submicron accuracy and production capacity, Nd:YAG micro-pulse laser welding is widely used in optical communication devices packaging. Different laser diode transceiver modules, i.e., To-Can-Type, Dual-in-Line-Type and Butterfly-Type laser diode modules [1][2][3], are packaged by Nd:YAG pulsed laser bonding. Despite the many advantages of pulse laser welding for micro joining, the rapid cooling and solidification in the weld pool introduces residual stress and post-weld shifting around the welded area, which results in poor coupling efficiency.…”

Section: Introductionmentioning

confidence: 99%

The Surface Absorption Coefficient of S304L Stainless Steel by Nd:YAG Micro-Pulse Laser

Kuang

Hung

Lai

et al. 2012

AMR

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The surface absorption coefficient of S304L stainless steel during Nd:YAG pulse laser welding process was derived by using the inverse engineering technique. The thermal-elastic-plastic finite element method is employed to calculate the temperature distribution, melting pool depth and shape with specific heat source. The derived melting pool depths and diameters with different values of absorption coefficient were compared with experimental results. In this study, the least square error method is used to obtain the equivalent absorption coefficient. The results show that the equivalent absorption coefficient of S304L stainless steel is in the range of 0.1~0.25 for low power intensity Nd:YAG impulse laser welding.

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Section: Introductionmentioning

confidence: 99%

The Surface Absorption Coefficient of S304L Stainless Steel by Nd:YAG Micro-Pulse Laser

Kuang

Hung

Lai

et al. 2012

AMR

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“…Advantages and disadvantages of these bonding approaches can be found in, for example, Zhou et al [2] and Labudovic and Burka [3]. Kuang et al [4] examined the post-weld-shift in dual-in-line laser package under laser welding process. Both simulation and experiment were conducted and found to be in good agreement.…”

Section: Introductionmentioning

confidence: 99%

“…Both simulation and experiment were conducted and found to be in good agreement. Kuang et al [4] concluded that the post-weld-shift might rise with the significant unbalanced residual stress distribution over the package, which is primary induced from the difference of the power density between two laser beams. Cheng et al [5] investigated the fiber alignment shift of fiber-solder-ferrule under the temperature cycling test.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Coupling Efficiency by Plastic Deformation of Tube Packaging for Thin-Film-Based Passive Optical Components

Wang

Liou

Tsai

2011

AMR

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Thin film based passive optical components assembled with a stainless steel tube via soldering is investigated under a packaging procedure. Finite element analysis is utilized to simulate the packaging procedure in the present study. Mismatch of the coefficient of thermal expansion among various components could induce residual stress over the assembly structure. Coupled thermal-elastoplastic analysis is adopted to predict the plastic deformation of the structure under the solidification process of solder joints. This post-solder-deformation could deteriorate the associated coupling efficiency due to the mis-alignment of the optical fibers. Temperature-dependent mechanical properties of the solder joint are employed in the simulations. Both two-dimensional plane strain and three-dimensional solid models are implemented into the analysis for comparisons. In order to improve the fiber alignment, and thus the coupling efficiency, a three-point bending device is externally loaded on the structure. Unloading procedure is subsequently performed to evaluate the ultimate deformed shape of the structure. Measurements of the insertion loss will be conducted using a power meter in the near future, while a correlation between the coupling efficiency and the fiber alignment can then be expected.

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“…In general, the connected components of the laser module package usually have different material properties such as different coefficients of thermal expansion (CTE), thermal conductivities, Young's modulus, Poisson's ratios, and yield strengths. During an Nd:YAG laser welding, and due to the material property differences between the welded components, the rapid solidification of the welded regions and the associated material shrinkage often introduced a postweld shift (PWS) [1][2][3][4][5][6][7][8] between the welded components. For a typical single-mode fiber application, if the PWS introduced from the laser welding joining process is even a few micrometers, up to 50% or greater loss in the coupled power may occur.…”

Section: Introductionmentioning

confidence: 99%

A Quantitative Postweld Shift Measurement and Compensation Technique in Butterfly Laser Module Packages

Hsu

Tsai

Kuang

et al. 2008

jjap

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A quantitative postweld shift (PWS) measurement and compensation technique employing a high-magnification camera with image capturing system (HMCICS) in butterfly-type laser module packages is investigated. The results show that the direction and magnitude of the fiber alignment shifts induced by the PWS in laser-welded butterfly-type laser module packaging can be quantitatively determined and compensated. The measured coupling powers in laser module packages after welding and compensation were clearly confirmed the measured fiber shifts that determined by the translational and rotational parameters. Therefore, the fiber shifts due to the PWS could be realigned back closer to their original optimum position after applying welding compensation, and hence the coupling powers loss due to the PWS could be regained. In comparison with previous studies of the PWS compensation by the well-known mechanical adjustment through a qualitative estimation technique, this HMCICS technique has successfully provided the mechanical adjustment through a quantitative compensation to the effect of the PWS on the fiber alignment shifts in butterfly-type laser module packages. The reliable butterfly-type laser modules with high yield used in lightwave transmission systems can be developed and fabricated.

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Post-weld-shift in dual-in-line laser package

Cited by 41 publications

References 8 publications

The Surface Absorption Coefficient of S304L Stainless Steel by Nd:YAG Micro-Pulse Laser

The Surface Absorption Coefficient of S304L Stainless Steel by Nd:YAG Micro-Pulse Laser

Investigation of Coupling Efficiency by Plastic Deformation of Tube Packaging for Thin-Film-Based Passive Optical Components

A Quantitative Postweld Shift Measurement and Compensation Technique in Butterfly Laser Module Packages

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