| 摘要 |
<p>A method for determining at least one parameter of a periodic spin function α(z) with period p, to be applied to an optical fibre along its length z during a drawing process, comprises selecting said at least one parameter so that (I) where ε1 is about 0.05 and η1 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 LB is an expected beat length of said optical fibre and α(z) is the derivative of the spin function α(z) with respect to the length z. The method is effective for substantially reducing the PMD of optical fibres drawn while applying a spin function as determined above.</p> |
