| 摘要 |
PURPOSE:To simply manufacture a preform rod for an optical fiber sustaining polarization in a high yield by putting a preform rod for a core, preform rods for applying stress, core materials, clad materials, etc. in a quartz glass pipe parallel to one another and by treating the pipe under heating. CONSTITUTION:A preform rod Rc for a core obtd. by laying a clad material 3 around a core material 1, preform rods Rs for applying stress, preform rods Rc' for cores each obtd. by laying a clad material 3 around a core material 1 and similar to the preform rod Rc, etc. are put in a quartz glass pipe 5 parallel to one another in the longitudinal direction of the pipe 5, and the pipe 5 is treated under heating. Thus, the gap among the rods is filled with quartz glass to form a clad 3a, giving a preform rod R1. The number of the preform rods Rc' for cores put in the pipe 5 can be selected suitably, and the core materials 1' and the clad materials 3 may be put separately in place of the rods Rc'. |
