Patent ID: 6389208
Filing Date: 2002-05-14
Classification: G02B

Abstract:
A single mode optical waveguide fiber designed for high data rate WDM telecommunications systems comprising:a core region comprising, a central region, having a radius r0, an index profile and a relative index of refraction &Dgr;0%, a first annular region, abutting said central region, having an index profile and a maximum index of refraction &Dgr;1%, and, a second annular region, abutting said first annular region, having a radius r2, a width w2, an index profile and a maximum index of refraction &Dgr;2%, wherein, &Dgr;0&gE;&Dgr;2>&Dgr;1; and, a clad layer, surrounding said core region, having a substantially constant index of refraction nc, wherein the maximum refractive index of the first annular region, n1, is such that n1&gE;nc; and, wherein, &Dgr;0% is in the range of about 0.79% to 1.21% and r0 is in the range of about 2.55 &mgr;m to 3.55 &mgr;m, &Dgr;1% is no greater than about 0.2%, and &Dgr;2% is in the range of about 0.3% to 1.2%, r2 is in the range of about 5.50 &mgr;m to 8.70 &mgr;m, w2 is in the range of about 0.4 &mgr;m to 2 &mgr;m, and the inner volume is in the range of about 2.9 units to 3.9 units and the outer volume is in the range having a lower limit greater than 7.2 units, an upper limit less than or equal to 10.2 units and a ratio of outer to inner volume in the range 1.96 to 3.04 units.