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Deposition of Hermetic Carbon Coatings on Silica Fibers

  • R. G. Huff (a1), F. V. DiMarcello (a1), A. C. Hart (a1) and K. L. Walker (a1)

Abstract

Carbon coated optical fibers have recently been shown to have excellent resistance to both static fatigue and hydrogen induced losses. The deposition technique used to form the carbon coating strongly affects the coating's ability to resist these degradation mechanisms. The system developed by AT&T utilizes an atmospheric CVD chamber in which a hydrocarbon has is pyrolyzed on the fiber surface. The heat retained in the fiber from the fiber forming process is used to drive the reaction, and high draw speeds are typically used to attain the ˜900°C temperature required to deposit the hermetic form of the carbon coating. Deposition rates of ˜1μm/sec are required to produce the ˜500 Å coating.

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1. Huff, R. G., DiMarcello, F. V., Hart, A. C. Jr., ”Amorphous Carbon Hermetically Coated Optical Fibers”. Technical Digest, OFC 1989, Paper TUG2.
2. Lu, K. E., Lee, M. T., Powers, D. R., Glaseman, S., ”Hermetically Coated Optical Fibers”. Technical Digest, Post-deadline paper PD1, OFC 1989.
3. Lemaire, P. J., Kranz, K. S., Walker, K. L., Huff, R. G., and DiMarcello, F. V., ”Hydrogen Permeation in Optical Fibers with Hermetic Carbon Coatings”. Electronic Letters, vol.24, no. 21, pgs. 13231324, Oct. 13, 1988.
4. Causey, R. A., Elleman, T. S., and Verghese, K., ”Hydrogen Diffusion and Solubility in Pyrolytic Carbon” Vol.17, pgs. 323328, Pergamon, 1979.
5. Hanson, E. G., Hiskes, R., Schantz, C. A., ”Optical Fiber with Hermetic Seal and Method for Making Same” U.S. Patent #45112629 Apr. 25, 1985.
6. Stein, M., ”Ion Plasma Deposition of Carbon-Indium Hermetic Coatings for Optical Fibers” Proc. Conference of Laser and Electro-optics, June 10–12, 1982.
7. Maurer, R. D., ”Fiber Fatigue: Present Status” Technical Digest, Conference of Optical Fiber Communications, Paper WCC1, 1982.
8. Chauduri, R. and Schultz, P. C., ”Hermetic Coatings on Optical Fibers” SPIE - Cambridge Symposium on Optoelectronics and Fiber Optic Applications in Science and Engineering, Cambridge, MA 1986.

Deposition of Hermetic Carbon Coatings on Silica Fibers

  • R. G. Huff (a1), F. V. DiMarcello (a1), A. C. Hart (a1) and K. L. Walker (a1)

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