Apparatus for reducing the polarisation mode dispersion of an optical fibre during drawing

摘要

Anti-PMD (Polarization Modal Dispersion) system comprises a pulley (P') oscillating in rotation. The pulley applies, during the formation of an optical fiber (FO), alternately in the clockwise and anti-clockwise directions, a torsion couple to the fiber so as to diminish its PMD. At least part of the external surface (SE') of the pulley in contact with the fiber during its formation is convex. An Independent claim is also claimed for the pulley used in the anti-PMD system.