Patent ID: 7891216
Filing Date: 2011-02-22
Classification: C03B

Abstract:
1. A method for producing an optical fiber having low polarization mode dispersion, comprising the steps of a) providing an optical fiber preform of glass material; b) heating the glass material of an end portion of the optical fiber preform in a furnace; c) drawing the heated glass material at a drawing speed V to form an optical fiber, each portion of the drawn glass material having a viscous zone when passing through the furnace, the viscous zone having a viscous zone length L; and d) applying to the optical fiber a substantially sinusoidal spin, which is transmitted to the viscous zone; characterized in that the spin function frequency ν, the viscous zone length L and the drawing speed V being such that both a torsion and at least a 50% detorsion are applied to the viscous zone of each portion of the drawn glass material, and a recovery of at least 50% occurs in the optical fiber.