Patent ID: 7072551
Filing Date: 2006-07-04
Classification: G02B

Abstract:
1. Single mode optical fibre comprising a first central region having a radius r 1 , a maximum refractive index value n 1 and at least one second ring surrounding said first central region, which second ring has a radius r 2 and a minimum refractive index value n 2 , wherein n 2 <n 1 , characterized in that the refractive index value n 1 is substantially constant in the first central region having radius r 1 , and in the second ring having radius r 2 the refractive index value decreases in radial direction from n 1 to n 2 over a distance r 1 −r 2 , with the decrease, which is substantially linear, taking place in accordance with the following equation: D n n wherein a dispersion slope ranges from 0.07 to 0.095 ps/km