Patent ID: 7995889

Claim:
An optical transmission fiber, comprising: a central core and an outer optical cladding, the central core having a step refractive-index profile and a first refractive index difference (Δn 1 ) with the outer cladding; and a first inner cladding surrounding the central core, the first inner cladding having a second refractive index difference (Δn 2 ) with the outer cladding; wherein the optical transmission fiber has a cabled cut-off wavelength of 1260 nanometers or less; wherein the optical transmission fiber has a dispersion cancellation wavelength (Δ 0 ) between 1300 nanometers and 1324 nanometers; wherein, at a wavelength of 1310 nanometers, the optical transmission fiber has a chromatic dispersion slope of 0.093 ps/(nm 2 ·km) or less; and wherein, at a wavelength of 1625 nanometers, the optical transmission fiber has bending losses of 2 dB or less for a winding of one turn around a bending radius of 5 millimeters.