Analysis of the Polymer Two-Layer Protective Coating Impact on Panda-Type Optical Fiber under Bending

Abstract

The article discusses the effects of thermal-force on the Panda-type optical fiber. The studies used a wide temperature range. The research used two thermal cycles with exposures to temperatures of 23, 60 and −60 °C. The field of residual stresses in the fiber formed during the drawing process was determined and applied. Panda was considered taking into account a two-layer viscoelastic polymer coating under conditions of tension winding on an aluminum coil in the framework of a contact problem. The paper investigated three variants of coil radius to analyze the effect of bending on fiber behavior. The effect of the coating thickness ratio on the system deformation and optical characteristics was analyzed. Qualitative and quantitative patterns of the effect of temperature, bending, thickness of individual polymer coating layers and relaxation transitions of their materials on the Panda optical fiber deformation and optical characteristics were established. Assessment of approaches to the calculation of optical characteristics (values of the refractive indices and fiber birefringence) are given in the framework of the study. The patterns of deformation and optical behavior of the Panda-type fiber with a protective coating, taking into account the nonlinear behavior of the system materials, were original results.

Assessment of the Influence of Protective Polymer Coating on Panda Fiber Performance Based on the Results of Multivariant Numerical Simulation

“…This has been confirmed by these studies. The birefringence value of Panda fiber varies within the range of [2 ÷ 5] • 10 −4 in the available literature [44,[61][62][63]. The values obtained in the described multivariate study are consistent with the results of other authors.…”

“…The mode birefringence found analytically for this fiber is 4.83 • 10 −4 according to [44]. The mode birefringence obtained at a fictitious temperature at the beginning of workpiece cooling: B = 4.89 • 10 −4 is elastic body; B = 4.69 • 10 −4 is viscoelastic body.…”

“…The coating material determines the practical applications of the fiber. Single-and multilayer polymer coatings are widely used [44,72]. However, many studies do not consider polymer coatings and their effect on fiber performance [55,62,73] or consider coatings without considering the viscoelastic nature of the materials [74,75].…”

“…It is implemented in the ANSYS Mechanical APDL package using the approximation of relaxation functions by exponential Prony series. The mathematical formulation and the obtained material constants are given in the articles [43,44].…”

“…The temperature dependence of material properties is described using the Williams-Landel-Ferry (WLF) temperature-time analogy [50]. The main parameters of the viscoelastic PC model are given in [44].…”