Skip to Main Content
Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.371332
The thermal stresses in double-coated optical fibers are analyzed by the viscoelastic theory. A closed form solution of the thermal stresses is obtained. The thermal stresses are proportional to the temperature change, and are a function of the material’s properties of the polymeric coatings and their thicknesses. The material’s properties of the polymeric coatings include the Young’s modulus, thermal expansion coefficient, Poisson’s ratio, and relaxation time. The relaxation of thermal stresses is strongly dependent on the relaxation time of the polymeric coating. If the relaxation time of the polymeric coating is very long, the viscous behavior of the polymeric coatings will not appear, and the thermal stresses solved by the viscoelastic theory are the same as those solved by the elastic theory. On the other hand, if the relaxation time of the polymeric coating is very short, the relaxation of thermal stresses is very apparent. A compressive radial stress at the interface of the glass fiber and primary coating will result in an increase of the microbending losses, and a tensile interfacial radial stress will possibly produce the debond at the interface of the glass fiber and primary coating. To minimize this interfacial radial stress, the radii, Young’s moduli, thermal expansion coefficients, and Poisson’s ratios of polymeric coatings should be appropriately selected, and the relaxation time of the primary coating should be decreased. Finally, the thermal stresses in single- and double-coated optical fibers are discussed. © 1999 American Institute of Physics.