Patent ID: 6647191
Filing Date: 2003-11-11
Classification: A61K,G02B

Abstract:
A single mode optical wave guide fiber, comprising:a core region having a central segment, a first annular segment, a second annular segment, and a third annular segment, each of the segments having a relative refractive index percent, and an inner and outer radius; and a clad layer surround and in contact with the core, the clad layer having a relative refractive index percent; and wherein, the radius and relative refractive index percent and the radii of each segment are chosen from the following ranges: the relative index of the central segment within the range of from about 0.53% to about 0.9%; the relative index of the first annular segment within the range of from about âˆ’0.2% to about 0.15%; the relative index of the second annular segment within the range of from about 0.1% to about 0.4%; the relative index of the third annular segment within the range of from about âˆ’0.2% to about 0; the outer radius of the central segment within the range of from about 3.1 &mgr;m to about 5.0 &mgr;m; the center radius of the second annular segment within the range of from about 11.69 &mgr;m to about 14.3 &mgr;m; and the width of the second annular segment within the range of from about 0.43 &mgr;m to about 5.3 &mgr;m; wherein the radius and relative refractive index percent and the radii of each segment are chosen to yield a dispersion zero less than about 1490 nm; and wherein the fiber has a cabled cutoff less than or equal to about 1260 nm.