Patent ID: 7437045

Claim:
A dispersion optimized optical fiber for wideband optical transmission comprising a centre core, a inner cladding, a ring core, a outer cladding and a outer glass region; characterized in that, relative refractive index of the centre core, the inner cladding, the ring core, the outer cladding and the outer glass region are constrained by the following equations: 0.4813≦Del 1 ≦0.5495; −0.0243≧Del 2 ≧−0.0520; 0.1590≦Del 3 ≦0.1865; −0.0243≧Del 4 ≧−0.0451; and Del 1 >Del 3 >Del 5 >Del 4 >Del 2 ; wherein, the relative refractive index of the centre core, inner cladding, ring core, outer cladding and outer glass region is identified by symbols Del 1, Del 2, Del 3, Del 4, and Del 5 respectively.