Post-weld-shift in semiconductor laser packaging

Wang, S.C.; Chang, H.L.; Wang, C.; Wang, C.M.; Liaw, Jy-Wang; Sheen, Maw-Tyan; Kuang, Jao-Hwa; Chien, Chih-Pen; Wang, G.L.; Cheng, Wood-Hi

doi:10.1109/ectc.1999.776339

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…For example, the laser beam delivered from the Nd:YAG laser to the workpiece were adjusted to an incident angle of 45 • in the cylindrical-type or dual-in line package (DIP) [6][7][8] and the incident is 30 • in the butterfly package [9] of the light-wave communication system. During the laser welding process for optoelectronic packaging, rapid cooling of solid phase and associated material shrinkage often cause a post weld shift (PWS) between the welded parts [5][6][7][8][9]. In case that the PWS induced by laser welding is a few micrometers, about 50% loss in coupled power will be incurred, resulting in performance degradation of the packaged components.…”

Section: Introductionmentioning

confidence: 99%

Effects of laser beam energy and incident angle on the pulse laser welding of stainless steel thin sheet

Liao

2007

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Effects of laser beam energy and incident angle on the pulse laser welding of stainless steel thin sheet

Liao

2007

Journal of Materials Processing Technology

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“…We aim to obtain a lateral alignment accuracy of < 0.1 µm for an acceptable insertion loss. The bottleneck in achieving this accuracy in present solutions is especially the fixation process and not the active alignment process itself [5], [6]. Adhesives are prone to shrinkage during or after the curing process, which causes misalignment after the final bonding step.…”

Section: Proposed Optical Fiber Array Conceptmentioning

confidence: 99%

A Concept for Accurate Edge-Coupled Multi-Fiber Photonic Interconnects

Gastel

Rosielle

Steinbuch

2019

J. Lightwave Technol.

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“…2 depicts a typical butterfly laser package [5], [6], composed of a single-mode fiber, a thermoelectric cooler (TEC), an optical subassembly-which is the platform onto which the laser diode and some of the other components are mounted-and the clip, which provides the welding interface between the fiber ferrule and the weld platform on the optical subassembly [7]. The tip of the fiber is encapsulated in a cylindrical metallic fiber ferrule.…”

Section: A Package Constructionmentioning

confidence: 99%

A novel inspection of fiber post-weld-shift in butterfly laser module packaging

Tseng

Sung

2005

IEEE Trans. Adv. Packag.

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Butterfly packaging technology with a fiber pigtail is widely used in packaging optical modules, and laser welding is used to join components in a butterfly package. During laser welding, the rapid solidification of the welded region and the associated shrinkage of material are expected cause relative movement between prealigned components. Such a post-weld-shift (PWS) might significantly reduce the efficiency of light coupling. The laser hammer technique can be used to realign fiber that shifts during laser welding, and it requires that the fiber shift be measured in three directions. Measuring the shift along the axis is difficult because space is limited. In this paper, a reflector placed near the fiber during laser welding was used to determine the shift along the -axis. The fiber images obtained using the charge-coupled device (CCD) camera were sometimes deformed, so digital image processing was used to calibrate the deformed images and calculate the fiber shift along three axes. The experimental results indicate that the fiber shift along the -axis, when captured using reflector inspection could be measured precisely, and more strongly influenced power coupling loss than shifts in the other two directions. The results are useful in implementing the realignment method after butterfly packaging.Index Terms-Butterfly package, fiber alignment shift, mirror inspection, post-weld-shift (PWS).

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Post-weld-shift in semiconductor laser packaging

Cited by 8 publications

References 7 publications

Effects of laser beam energy and incident angle on the pulse laser welding of stainless steel thin sheet

Effects of laser beam energy and incident angle on the pulse laser welding of stainless steel thin sheet

A Concept for Accurate Edge-Coupled Multi-Fiber Photonic Interconnects

A novel inspection of fiber post-weld-shift in butterfly laser module packaging

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