Practical Design of Lensed Fibers for Semiconductor Laser Packaging Using Laser Welding Technique

Author

Song, Jeong Hwan ; Fernando, Harendra N J ; Roycroft, Brendan ; Corbett, Brian ; Peters, Frank H.

Author_Institution

Integrated Photonics Group, Tyndall Nat. Inst., Cork

Volume

27

Issue

11

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

1533

Lastpage

1539

Abstract

We propose a set of guidelines for the practical design of lensed fiber for the optical coupling of semiconductor lasers in butterfly packages using laser welding. These guidelines have optimized the tradeoff between coupling efficiency and alignment tolerance. Moreover, a radius of curvature of 11 mum is shown to be optimal for semiconductor lasers whose divergence angles range from 5deg to 30deg. To experimentally evaluate the design, lensed fibers were assembled by a Nd:YAG laser welding technique in conventional butterfly packages and their coupling efficiencies were 28%-72% without horizontal misalignment compensation.

Keywords

laser beam welding; lenses; neodymium; optical design techniques; optical fibre losses; semiconductor device packaging; semiconductor lasers; YAG:Nd; butterfly package; laser welding technique; lensed fiber; lensed fiber design; optical coupling; optical loss; semiconductor laser packaging; size 11 mum; Laser welding; lensed fiber; optical coupling; optical packaging;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2009.2014252

Filename

4840455