Method for fabricating a multimode optical fiber preform having longitudinal uniformity

摘要

A method for fabricating a multimode optical fiber preform having a longitudinal uniformity is provided. The method of fabricating includes performing a plurality of radial deposition passes using a thermal source while inserting raw materials into a glass tube. A reference chemical core shape index is set to determine a refractive index profile of a preform section. A core shape index distribution of each longitudinal deposition pass varying in a longitudinal direction of the glass tube is set such that an error of a reference chemical core shape index distribution in the longitudinal direction of the preform defined by the reference chemical core shape index is compensated for and such that a uniform chemical core shape index is obtained in the longitudinal direction. Deposition is performed while an amount of raw materials corresponding to a preset chemical core shape index is inserted in each longitudinal deposition pass of each radial deposition pass.