Patent ID: 7043125
Filing Date: 2006-05-09
Classification: G02B,H04B

Abstract:
1. A single mode optical waveguide fiber comprising: a core region surrounded by a clad layer, said core region having an outside radius; wherein, said clad layer includes a first region and a second region each having a respective relative refractive index percent, the second region having a relative refractive index percent greater than the relative refractive index percent of the first region, and the first region being located between the core region and the second region of said clad layer; wherein the core region has a relative refractive index percent greater than the respective relative refractive index percents of the first and second regions, and, wherein, said core region outside radius and said respective relative refractive index percents of the first and second region of said clad layer are selected to provide a single mode optical waveguide fiber in cabled configuration having a cut off wavelength no greater than about 850 nm.