| 摘要 |
The present invention provides a drawing method for optical fiber, which is capable of reducing attenuation at 1.55 um due to Rayleigh scattering, even if the drawing speed is high. The reduction of the attenuation of the optical fiber 3 is realized by conducting a preliminary cooling in a first cooling zone 4, which has a low convection heat transfer coefficient, for reducing the temperature of the as-drawn optical fiber just before entering into a second cooling zone 5. The optical fiber is obtained after being cooled in the second cooling zone 5, which has a higher convection heat transfer coefficient.
|
