NDLI: Thermally induced stresses in an optical glass fiber soldered into a ferrule

Content Provider	IEEE Xplore Digital Library
Author	Suhir, E.
Copyright Year	1983
Abstract	An analytical model is developed for the evaluation of the thermally induced stresses in the midportion of an optical glass fiber soldered into a ferrule. The purpose of the analysis is to select the appropriate solder material and the geometry of the solder joint. We show that the ferrule has the major effect on the stresses in the glass and the solder, and that, for conventional solders, low expansion ferrules (Invar) result in high-tensile radial and tangential stresses in both the glass and the solder. On the other hand, high-expansion ferrules (aluminum, nickel) result in excessive compressive stresses and therefore should also be avoided. However, ferrule materials of moderate expansion (Kovar) lead to low stresses and are recommended, We show also that high-modulus solders, such as gold-tin, result in substantially higher stresses than low modulus solders, such as silver-tin, and that thinner solder layers lead to lower stresses in the glass, but to higher tangential and axial stresses in the solder. We conclude that the appropriate solder material and the thickness of the solder ring can be established, based on the developed stress model, depending on the material and thickness of the ferrule, and the characteristics of the solder itself.<>
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	1766
Ending Page	1770
Page Count	5
File Size	435175
File Format	PDF
ISSN	07338724
Volume Number	12
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thermal stresses Glass Optical fibers Compressive stress Lead Analytical models Joining materials Optical materials Geometrical optics Soldering
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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