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Thermal stresses in carbon-coated optical fibers at low temperature

Published online by Cambridge University Press:  31 January 2011

Sham-Tsong Shiue  and
Wen-Hao Lee
Sham-Tsong Shiue
Affiliation:
Department of Materials Science, Feng Chia University, Taichung, Taiwan, Republic of China
Wen-Hao Lee
Affiliation:
Department of Materials Science, Feng Chia University, Taichung, Taiwan, Republic of China
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Abstract

The thermal stresses in carbon-coated optical fibers at low temperature have been analyzed. The thermally induced lateral pressure in the glass fiber would produce microbending loss. In order to minimize such a microbending loss, the thickness, Young's modulus, and Poisson's ratio of the carbon coating should be decreased. On the other hand, the maximum thermal stress is the tangential stress in the carbon coating that occurs at the interface of the carbon coating and glass fiber. It was experimentally observed that if the maximum thermal stress is larger than the tensile strength of the carbon coating, the carbon coating will be broken along the axial direction. In order to minimize such a maximum thermal stress, the thickness of the carbon coating should be increased, but Young's modulus, thermal expansion coefficient, and Poisson's ratio of the carbon coating should be decreased. Finally, an optimal selection of the carbon coating for optical fiber is discussed.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 9 , September 1997 , pp. 2493 - 2498
Copyright
Copyright © Materials Research Society 1997

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References

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