Patent ID: 6430346
Filing Date: 2002-08-06
Classification: G02B

Abstract:
An optical waveguide fiber comprising:a core region having a centerline and at least two segments, each said segment having a relative refractive index, a refractive index profile, and an inner and an outer radius, the radii being measured with reference to the centerline; a clad layer surrounding and in contact with the core region, said clad layer having a relative index and a refractive index profile; wherein, said core and clad refractive index profiles are configured to guide light having a wavelength within a wavelength range; and wherein, the respective relative indexes of said at least two segments are positive wherein the reference refractive index, of the relative indexes, is the average refractive index of the clad layer, and, the respective relative indexes, refractive index profiles and inner and outer radii of said at least two segments are chosen to provide a waveguide fiber having negative total dispersion at 1530 nm and a positive dispersion slope over the range 1530 nm to 1565 nm, and a zero dispersion wavelength greater than 1595 nm.