Patent ID: 6430347
Filing Date: 2002-08-06
Classification: G02B,H04B

Abstract:
A dispersion compensating optical waveguide fiber comprising:a core region having a refractive index profile and a centerline; and, a clad layer surrounding and in contact with said core region, said clad layer having a refractive index profile, wherein said core and clad refractive index profiles are configured to guide light; wherein, said core region includes at least four segments, each said segment having respective inner and an outer radii referenced to the centerline and a respective refractive index profile, a central segment located about the centerline and having a relative index &Dgr;0% in the range of about 0.6% to 1.1%, a first annular segment surrounding the central segment and having a relative index &Dgr;1 more negative than aboutâˆ’0.4%, a second annular segment surrounding the first annular segment having a relative index &Dgr;2%&gE;0 and, a third annular segment having an inner and an outer radius referenced to the centerline, a refractive index profile and a relative index &Dgr;3%&lE;0.2%; wherein, said core region refractive index profile is chosen to provide a negative total dispersion and a total dispersion slope more negative than about âˆ’0.2 ps/nm2-km, over a wavelength range from 1500 nm to 1700 nm .