Effect of polymeric coatings on the static fatigue of double-coated optical fibers

Abstract

The effect of polymeric coatings on the static fatigue of double-coated optical fibers is investigated. A closed form solution of the tensile stress in the glass fiber under the action of a constant tensile force in the fiber's axial direction is obtained using viscoelastic theory. The tensile force is applied to the glass fiber and polymeric coatings. The applied tensile fore is gradually transferred from the polymeric coating to the glass fiber due to the viscoelastic behavior of the former, and the tensile stress in the glass fiber increases with time. This increase accelerates the failure of the glass fiber. The thickness and Young's modulus of the secondary coating should be increased to ensure the long-term reliability of optical fibers, and the relaxation time of the secondary coating should be significantly larger than the expected lifetime of the optical fiber. However, the ratio of the proof-test load to the allowable external load should be increased if the secondary coating of the optical fiber has a high axial rigidity and low relaxation time.

Effect of temperature cycling on the static fatigue of double-coated optical fibers

“…Moreover, A 0 and A 2 represent the crosssectional areas of the glass fiber and the secondary coating, respectively. 9,17,[20][21][22][23][24] Accordingly, the long-term stresses in optical fibers can be solved by the viscoelastic theory, as follows. Although the approach stated here is less rigorous than the exact theory-of-elasticity treatment, 18 it often enables easy to use and sufficient accurate solutions to be obtained.…”

“…Long-term stability is an important requirement for optical transmission, so optical fibers must maintain stable performance in the most severe conditions. 1,[3][4][5][6][7][8][9] The static fatigue test involves applying a constant tensile force on the optical fiber along the axial direction (i.e., mode I loading), and then examining the fiber failure time. The main functions of the polymeric coatings are to protect the fiber from external damage, abrasion resistance, static-fatigue protection, and bending insensitivity.…”

Measurement of creep of optical fiber by a low coherent white light double interferometer system

“…When they are combined, the appearing properties of this composite material will be visco-elasitc [4] . For the pre-stressed optical fiber, the creep property is the most important to be considered to avoid the stress relaxation [5][6][7][8] . In this paper, the creep properties of the optical fiber were studied experimentally, the optical fibers were under cyclic loading and static loading respectively and the creeps were measured with a low coherence double reflected interferometer.…”

Application of Micro-Attenuated Total Reflectance Infrared Spectroscopy to Quantitative Analysis of Optical Fiber Coatings: Effects of Optical Contact

“…34 The coating's Young's modulus is known to affect the fiber attenuation and can also affect the fiber mechanical reliability. [35][36][37][38] Determination of the degree of cure by infrared spectroscopy requires measuring intensities of the acrylate and reference peaks. However, relatively small fiber diameters (;100 lm) and their cylindrical shape result in imperfect optical contact between the fiber coating and the flat surface of the IRE when micro-ATR is used.…”