Welding-induced alignment distortion in DIP LD packages: effect of laser welding sequence

Wenning Liu; Yaomin Lin; Frank G. Shi

doi:10.1117/12.469560

3 June 2002 Welding-induced alignment distortion in DIP LD packages: effect of laser welding sequence

Wenning Liu, Yaomin Lin, Frank G. Shi

Proceedings Volume 4652, Optoelectronic Interconnects, Integrated Circuits, and Packaging; (2002) https://doi.org/10.1117/12.469560
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States

Abstract

In pigtailing of a single mode fiber to a semiconductor laser for optical communication applications, the tolerance for displacement of the fiber relative to the laser is extremely tight, a submicron movement can often lead to a significant misalignment and thus the reduction in the power coupled into the fiber. Among various fiber pigtailing assembly technologies, pulsed laser welding is the method with submicron accuracy and is most conducive to automation. However, the melting-solidification process during laser welding can often distort the pre-achieved fiber-optic alignment. This Welding-Induced-Alignment-Distortion (WIAD) is a serious concern and significantly affects the yield for single mode fiber pigtailing to a semiconductor laser. This work presents a method for predicting WIAD as a function of various processing, laser, tooling and materials parameters. More specifically, the degree of WIAD produced by the laser welding in a dual-in-line laser diode package is predicted for the first time. An optimal welding sequence is obtained for minimizing WIAD.

Citation Download Citation

Wenning Liu, Yaomin Lin, and Frank G. Shi "Welding-induced alignment distortion in DIP LD packages: effect of laser welding sequence", Proc. SPIE 4652, Optoelectronic Interconnects, Integrated Circuits, and Packaging, (3 June 2002); https://doi.org/10.1117/12.469560

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