| 摘要 |
A compensating optical fibre length (12) having a negative chromatic dispersion slope, said compensating optical fibre (12) having a core region (13) surrounded by a cladding region (14), the cladding region (14) defining a first ring of holes, which substantially defines, around the core region (13) an annulus with an inner radius r1 and an outer radius r2, and at least one second ring of holes that surrounds the first ring of holes, said holes running along the compensating optical fibre (12) longitudinally and being spaced apart from each other substantially according to a predefined pitch LAMBDA , wherein a) the values of said inner radius r1 and said outer radius r2 are selected to satisfy the following relationship r1 ≤ lambda /n ≤ r2 where n is the refractive index of the material making up the core region (13) of said compensating optical fibre length (12) b) the holes of said first and said at least one second ring are substantially of the same diameter d, and c) the ratio d/ LAMBDA substantially satisfies the following relationship (A) 0.8 ≤ d/ LAMBDA < 1. |
