Of the heavily the ion injecting to the specified position in the long prismatic vitreous body in state thin beam making use of the production

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a columnar glass body which has a plurality of areas continuing in the longitudinal direction and having a high heavy ion concentration; and a method for producing an optical fiber having a plurality of cores.;SOLUTION: A columnar glass body which has a plurality of areas continuing in the longitudinal direction and having a high heavy ion concentration is produced as follows: a heavy ion in a thin beam state is implanted at a specified position in a long columnar glass body to form an area with a high heavy ion concentration; by successively changing the relative positions of an ion accelerator and the columnar glass body in the longitudinal direction of the columnar glass body, the heavy ion in a thin beam state is successively implanted into the columnar glass body to form an area continuing in the longitudinal direction and having a high heavy ion concentration; and the above operations are repeated at least twice at other positions in the columnar glass body to form a plurality of areas continuing in the longitudinal direction and having a high heavy ion concentration. An optical fiber having a plurality of cores is produced by subjecting the columnar glass body having a plurality of areas continuing in the longitudinal direction and having a high heavy ion concentration to a drawing treatment in the longitudinal direction.;COPYRIGHT: (C)2005,JPO&NCIPI