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Proceedings Paper

Cylindrical lensed fibers optimized for 980-nm pump laser diode coupling
Author(s): Haiqing Tang; Quan J. Zhang; Faying Zhao; Hao Xue
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Paper Abstract

A theoretical model is presented to calculate the fiber coupling efficiency and alignment tolerances for the case of a 980nm pump laser diode directly coupled to a round-shaped cylindrical lensed fiber (CLF). Both radius and wedge angle of the round-shaped cylindrical lens are optimized for maximal coupling efficiency. It is found that with proper design, a coupling efficiency up to 98% may be obtained theoretically. The alignment tolerances for all three directions (vertical, horizontal and axial offsets) are also calculated, and found that the vertical offset tolerance is critical and presents the biggest challenge in packaging. In addition, it is also found that both LD-to-CLF distance and lens shape affect the vertical offset tolerance, and can be varied to improve this tolerance.

Paper Details

Date Published: 29 August 2002
PDF: 4 pages
Proc. SPIE 4905, Materials and Devices for Optical and Wireless Communications, (29 August 2002); doi: 10.1117/12.480998
Show Author Affiliations
Haiqing Tang, Hangzhou Lambda Photonics Technology Co., Ltd. (China)
Quan J. Zhang, Zhejiang Univ. (China)
Faying Zhao, Zhejiang Univ. (China)
Hao Xue, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 4905:
Materials and Devices for Optical and Wireless Communications
Constance J. Chang-Hasnain; YuXing Xia; Kenichi Iga, Editor(s)

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