Patent ID: 6349163
Filing Date: 2002-02-19
Classification: G02B,Y10S

Abstract:
A single mode optical waveguide fiber, comprising:a core glass region, disposed about the axial centerline of the waveguide fiber, comprising at least three segments, each having a refractive index profile, the first segment, and having a radius, r1, extending from the centerline to the point of said first segment located farthest from the centerline, and, a relative refractive index percent, &Dgr;1%, and additional segments, adjacent one another, extending radially outward from said first segment, having respective radii, ri, extending from the centerline to the point of said ith segment located farthest from the centerline, and, relative refractive index percent, &Dgr;i%, i=2 to n, wherein n is the number of said segments, said first segment symmetrically positioned about the long axis of the optical waveguide fiber, wherein &Dgr;i% is positive, and, at least one segment having a &Dgr;i% which is negative; and, a clad glass layer surrounding said core glass region having a refractive index, nc, which is less that the refractive index of at least a part of said core glass region; wherein the respective radii, r1 and ri, and relative refractive index percents, &Dgr;1% and &Dgr;i%, are chosen to provide a total dispersion at 1550 nm which is negative and of a magnitude greater than about âˆ’150 ps/nm-km and a dispersion slope at 1550 which is more negative than about âˆ’1.0 ps/nm2-km.