| 摘要 |
A cylindrical preform (11) is drawn in its longitudinal direction to be a plastic optical fiber (21) by a drawing process (27). The preform (11) is produced by polymerizing an inner clad material in a hollow portion of an outer clad pipe (23) to form an inner clad (15), and then polymerizing a core material in a hollow portion of the inner clad (15) to form a core (12). After the polymerization of the inner clad material, the outer clad pipe (23) is subject to a heating under reduced pressure (25) to reduce penetration of the inner clad material into the outer clad pipe (23), such that a concentration of the inner clad material and its polymer penetrated in said outer shell is no more than 1.6 wt.%. Accordingly, an unevenness viscosity of the melted preform (11) for the drawing is reduced and the obtained plastic optical fiber (21) has an uniform transmission property. |
