| 摘要 |
PURPOSE:To execute a recognition visually by putting a colored identification mark on the whole surface of a glass fiber body or a part of the circumferential surface in the lengthwise direction. CONSTITUTION:A body of a glass fiber for optical communication is formed by a core 10 having a refractive index n1, a clad 20 which has a refractive index n2 and covers the outside of the core 10, and a clad which has an opaque coloring matter, covers a part of the outside of the clad 20 or the whole, and performs a coloring to the surface of the glass fiber body. Generally speaking, the part contributed to propagation of light is the core 10 and a mere small part of the core 10 side of the clad 20, therefore, the clad 30 containing the opaque coloring matter exerts no adverse influence on propagation of light. |
