- 作者: Sham-Tsong Shiue
- 中文摘要: The design of hermetically metal-coated optical fibers to minimize hydrostatic pressure induced stresses is investigated. Several stresses are important in a hermetically metal-coated optical fiber. First, the interfacial radial stress results in microbending loss. Secondly, the axial force in the glass fiber induces buckling of the fiber and also results in an increase of bending loss. Thirdly, when the interfacial shear stress is larger than its shear strength, the metallic coating is delaminated from the glass fiber. Finally, when the normal stress in the metallic coating is larger than its tensile strength, the metallic coating is broken. These stresses can be minimized by appropriately selecting the physical properties of the metallic coating and its thickness. For an optimal design of a metal-coated optical fiber, the thickness and Young's modulus of the metallic coating is first chosen so as to sustain the mechanical force, and then the Poisson's ratio of the metallic coating is selected to satisfy the relation: E1/E0 = vl(l+vl)/(vl-v0vl-2v0), where E0, v0, E1, and vl represent the Young's modulus of the glass fiber, the Poisson's ratio of the glass fiber, the Young's modulus of the metallic coating and the Poisson's ratio of the metallic coating, respectively.
- 英文摘要: --
- 中文關鍵字: optical fiber, metallic coating, stress, hydrostatic pressure.
- 英文關鍵字: --