Optical fiber having reduced polarization mode dispersion (PMD) and method for producing the same

摘要

A process for producing optical fiber preform having symmetrically and completely collapsed capillary which is suitable for producing optical fiber having reduced PMD is provided, wherein collapsing of the capillary in the hollow soot porous body or sintered glass body is carried out under variable vacuum. An optical fiber preform produced by such method and optical fiber produced from such optical fiber preform are also provided.