| 摘要 |
<p>A single mode fiber comprises a core, an inner cladding, a depressed cladding and an outer cladding composed of pure silica glass. The core is composed of silica glass doped with germanium and fluorine, with a diameter (a) of 8.0-8.8 µm, a relative refractive index difference (” 1 ) of 0.35-0.38%, and the contribution of fluoride (” F ) is -0.09 ± 0.02%. The inner cladding is composed of silica glass doped with germanium and fluorine, with a diameter (b) of 18-21 µm and a relative refractive index difference (” 2 ) of 0 ± 0.02%. The depressed cladding is composed of silica glass doped with fluorine, with a diameter (c) of 26-36 µm and a relative refractive index difference (” 32 ) at the external interface thereof is between -0.22 and -0.35%, and a relative refractive index difference (” 31 ) at the internal interface thereof is between -0.20 and -0.3 5%, and ” 32 ‰¤” 31 . The fiber is able to improve the fiber bending resistance, prevent the additional stresses generated by fiber bending from passing on to the core for avoiding the increase of attenuation, thereby effectively improving the mechanical properties and service life of the fiber.</p> |
