APPARATUS FOR MANUFACTURING AN OPTICAL FIBER PREFORM AND INCLUDING A RING FOR TRAPPING AND DIFFUSING LIGHT RADIATION

摘要

The invention relates to apparatus for manufacturing an optical fiber preform from a tube of vitreous material, the apparatus comprising: means for holding said tube during manufacture of said preform; and heater means supplying said tube with the heat energy required for manufacturing said preform. According to the invention, diffuser means are disposed around at least one of the ends of said tube to trap and diffuse light radiation generated in said tube by said heater means. The invention also applies to apparatus for drawing an optical fiber from a preform.