Optical fiber with large effective area, low dispersion and low dispersion slope

A method for constructing a single mode optical waveguide fiber, comprising:

• forming a central core segment having a relative index within the range of from about 0.53% to about 0.9%, and an outer radius within the range of from about 3.1 μm to about 5.0 μm;
• forming a first annular core segment about the central core segment, the first annular core segment having a relative index within the range of from about −0.2% to about 0.15%;
• and
• forming a second annular core segment about the first annular core segment, the second annular core segment having a relative index within the range of from about 0.1% to about 0.4%, a center radius within the range of from about 6.18 μm to about 7.7 μm, and a width within the range of from about 0.4 μm to about 5.3 μm;
• 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.

A method for constructing a single mode optical waveguide fiber, comprising:

• forming a central core segment having a relative index within the range of from about 0.5 3% to about 0.9%, and an outer radius within the range of from about 3.1 μm to about 5.0 μm;
• forming a first annular core segment about the central core segment, the first annular core segment having a relative index within the range of from about −0.2% to about 0.15%;
• forming a second annular core segment about the first annular core segment, the second annular core segment having a relative index within the range of from about 0.1% to about 0.4%, a center radius within the range of from about 11.69 μm to about 14.3 μm, and a width within the range of from about 0.4 μm to about 5.3 μm;
• and
• forming a third annular core segment about the second annular core segment, the third annular core segment having a relative index within the range of from about −0.2% to about 0%;
• 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.

A single mode optical waveguide fiber comprising:

• a core region having a central segment, a first annular segment and a second annular segment, each of the segments having a positive 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;
• 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;
• a dispersion slope of less than about 0.07 ps/nm2-km;
• a cabled cutoff less than or equal to about 1260 nm;
• and
• an effective area of greater than or equal to about 45 μm2.