Patent ID: 6952518
Filing Date: 2005-10-04
Classification: G02B

Abstract:
1. A low dispersion slope dispersion-shifted single-mode fiber for large capacity transmission comprising a core and a cladding is characterized in that said core has three segments having different refractive index profiles, and said cladding has four cladding segments, wherein, the relative refractive index difference ΔCore1% of the first core segment of said core ranges from 0.35% to 0.48%, its diameter ΦCore1 ranges approximately from 2.0 μm to 7.0 μm; the relative refractive index difference ΔCore2% of the second core segment Core2 ranges approximately from 0.25% to 0.65%, and the diameter ΦCore2 ranges approximately from 3.0 μm to 8.0 μm; the relative refractive index difference ΔCore3% of the third core segment Core3 ranges approximately from 0.1% to 0.4%, and the diameter ΦCore3 ranges approximately from 4.0 μm to 10.0 μm; the relative refractive index difference ΔClad1% of the first cladding segment Clad1 ranges approximately from −0.2% to 0.1%, and the diameter ΦClad1 ranges approximately from 8.0 μm to 16.0 μm; the relative refractive index difference ΔClad2% of the second cladding segment Clad2 ranges approximately from 0.1% to 0.4%, and the diameter ΦClad2 ranges approximately from 12.0 μm to 25.0 μm; the relative refractive index difference ΔClad3% of the third cladding segment Clad3 ranges approximately from −0.2% to 0.2%, and the diameter ΦClad3 ranges approximately from 19.0 μm to 30.0 μm; the fourth cladding segment is a layer of pure silica glass, and its refractive index is the refractive index of the pure silica glass nc, the total dispersion slope of said fiber at 1550 nm is less than 0.060 ps/nm