公开(公告)号：BR9707059A

公开(公告)日：1999-07-20

申请号：BR9707059

申请日：1997-01-21

Applicant: CORNING INC

Inventor： HENSERSON DANNY LEE ,  LI MING-JUN ,  NOLAN DANIEL A ,  WASHBURN GLENDEA R

IPC: G02B6/00 ,  C03B37/027 ,  C03B37/03 ,  G02B6/02 ,  G02B6/024

Abstract: The invention provides improved methods for reducing polarization mode dispersion (PMD) in single mode fiber by spinning the fiber during the drawing process in accordance with a spin function having sufficient harmonic content to achieve low levels of PMD for commercial fibers for which the beat lengths of the fibers, including the beat lengths of different portions of the fibers, are variable and thus not readily known in advance. The spin functions of the invention take advantage of certain resonances in energy transfer between polarization modes to achieve substantial reductions in PMD for a wide range of beat lengths. Examples of suitable spin functions include frequency-modulated and amplitude-modulated sine waves.