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Proceedings Paper

Welding-induced alignment distortion in DIP LD packages: effect of laser welding sequence
Author(s): Wenning Liu; Yaomin Lin; Frank G. Shi
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Paper 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.

Paper Details

Date Published: 3 June 2002
PDF: 8 pages
Proc. SPIE 4652, Optoelectronic Interconnects, Integrated Circuits, and Packaging, (3 June 2002); doi: 10.1117/12.469560
Show Author Affiliations
Wenning Liu, Univ. of California/Irvine (United States)
Yaomin Lin, Univ. of California/Irvine (United States)
Frank G. Shi, Univ. of California/Irvine (United States)

Published in SPIE Proceedings Vol. 4652:
Optoelectronic Interconnects, Integrated Circuits, and Packaging
Louay A. Eldada; John R. Rowlette; Randy A. Heyler; Randy A. Heyler; John R. Rowlette, Editor(s)

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