| 摘要 |
PURPOSE:To improve long-term reliability and to enable the use under adverse environmental conditions by storing optical fiber strands coated thereon with metallic layers in a metallic pipe, and filling ceramics in the gaps among the strands thereby constituting an optical fiber. CONSTITUTION:A unit of an optical fiber cable is manufactured from three optical fiber strands 31 each coated thereon with a metallic layer 32 and further coated thereon with a ceramic layer 33, a central tension member 41, and three feeders 51. Each strand 31 having 50mum core diameter and 150mum clad diameter is used, and each layer 32 is formed by coating WSi (tungsten silicide) and forming the same to 2mum thickness. The layer 33 consists essentially of Al2O3 and has 2mm. outside diameter. These members (three optical fiber strands, one tension member and three feeders) are assembled in a copper pipe 61 of 10mm. outside diameter and 6mm. inside diameter, and the gaps in the pipe 61 are filled with a ceramic layer 71 of Al2O3. |
