Method of manufacturing distributed refractive index optical fiber

摘要

PCT No. PCT/JP98/01047 Sec. 371 Date Nov. 13, 1998 Sec. 102(e) Date Nov. 13, 1998 PCT Filed Mar. 12, 1998 PCT Pub. No. WO98/40768 PCT Pub. Date Sep. 17, 1998A cylindrical base material having an outer and inner at least two layer structure is produced by using a cylindrical molded body made of a low-refractive-index material as a mold, and forming at least one layer made of a layer-forming material having a relatively high refractive index in the inner surface of the cylindrical molded body by the rotational molding, wherein the centrifugal force during the rotational molding is changed.