Optical fibre with reduced polarization mode dispersion and method for obtaining an optical fibre with reduced polarization mode dispersion

摘要

A method for determining at least one parameter of a periodic spin function &agr;(z) with period p, to be applied to an optical fibre along its length z during a drawing process. At least one parameter is selected so that (I) where &egr;₁ is about 0.05 and y₁ is the first of the three components y₁(z), Y₂(z), y₃(z) of a periodic function y(z) of period p such that (II) where L_B is an expected beat length of said optical fibre and &agr;(z) is the derivative of the spin function &agr;(z) with respect to the length z. The method is effective for substantially reducing the PMD of optical fibres drawn when applying a spin function.