Abstract

During the mass production of silica-based optical fibers, a large fiber preform is softened in a high-temperature furnace and is drawn to a small fiber with a diameter of about 125 µm . The hot fiber exiting the furnace is cooled rapidly by the surrounding air or by blowing a gas, and is subsequently coated with a polymer layer to provide a protection of the fiber surface. The overall quality of the fiber depends on the uniformity of the coating layer, which is strongly influenced by the manufacturing conditions. While the average thickness of the coating layer is extensively investigated in the literature, the studies on the coating thickness fluctuation lack a sound fundamental basis. In this paper, a linear perturbation analysis is adopted to predict the coating thickness variation under different processing conditions. An experimental correlation is developed to determine the initial amplitude of the thickness disturbance. Numerical results are presented for the first time to directly link the processing and geometric parameters with the coating thickness fluctuation in the final product. The results provide guidelines for selecting coating materials, system designs, and processing parameters to achieve uniform fiber coating layers.

© 2005 IEEE

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Appl. Opt. (1)

Other (18)

S. Sakaguchi and T. Kimura, "High-speed drawing of optical fibers with pressurized coating", J. Lightw. Technol., vol. LT-3, no. 3, pp. 669-673, Jun. 1985.

H. Koaizawa, N. Orita and T. Kamiya, "Study of coating diameter at high speed drawing", in 10th Int. Conf. Integrated Optics Optical Fiber Commun. Tech. Dig., vol. FA1-2, Hong Kong, 1995, pp. 4- 5.

M. Wagatsuma, T. Kimura and S. Yamakawa, "Slip mechanism in optical fiber coating with open cup applicators", J. Lightw. Technol., vol. LT-4, no. 4, pp. 1414-1419, Sep. 1986.

K. Kobayashi, K. Tsurusaki, Y. Sato and S. Araki, "High-speed coating of optical fibers with UV curable resins", in Int. Wire Cable 40th Symp., 1991, pp. 126-133.

S. Tomotika, "On the instability of a cylindrical thread of a viscous liquid surrounded by another viscous liquid", Proc. Roy. Soc. A, vol. 150, pp. 322-337, 1935.

S. P. Lin and W. C. Liu, "Instability of film coating of wires and tubes", AICHE J., vol. 21, pp. 775-782, 1975.

S. L. Goren, "The instability of an annular thread of fluid", J. Fluid Mech., vol. 12, pp. 309-319, 1962.

J. Lin and C. Weng, "Linear stability analysis of condensate film flows down a vertical cylinder", Chem. Eng. Comm., vol. 57, pp. 263-276, 1987.

D. Quere, "Thin films flowing on vertical fibers", Europhys. Lett., vol. 13, pp. 721-726, 1990.

A. L. Frenkel, "Nonlinear theory of strongly undulating thin films flowing down vertical cylinders", Europhys. Lett., vol. 18, pp. 583-588, 1992.

P. Cheng, C. Chen and H. Lai, "Nonlinear stability analysis of thin viscoelastic film flow traveling down along a vertical cylinder", Nonlinear Dyn., vol. 24, pp. 305-332, 2001.

N. Ashgriz and F. Mashayek, "Temporal analysis of capillary jet breakup", J. Fluid Mech., vol. 291, pp. 163-190, 1995.

X. Guan and R. Pitchumani, "Viscous fingering in a hele-shaw cell with finite viscosity ratio and interfacial tension", ASME J. Fluid Engr., vol. 125, pp. 354-364, 2003.

R. V. Birikh, V. A. Briskman, M. G. Velarde and J. C. Legros, Liquid Interfacial Systems Oscillations and Instability, New York: Marcel Dekker, 2003.

U. C. Paek, "Free drawing and polymer coating of silica glass optical fibers", Trans. ASME , vol. 121, pp. 774-788, 1999.

U. C. Paek and C. M. Schroeder, "Optical performance of lightguide fibers coated at 10 m/s", in Proc. Optical Fiber Communications Conf. (OFC 1985) , San Diego, CA, 1985, p. 64.

C. M. G. Jochem and J. W. C. Van Der Ligt, "Cooling and bubble-free coating of optical fibers at a high drawing rate", J. Lightw. Technol., vol. LT-4, no. 7, pp. 739-742, Jul. 1986.

C. Y. Zhao and S. H. K. Lee, "Physical considerations of a pressurized optical fiber coating process", J. Materials Processing Manufacturing Sci., vol. 8, pp. 53-73, 1999.

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