Patent ID: 6317551
Filing Date: 2001-11-13
Classification: G02B

Abstract:
A single mode optical waveguide fiber comprising:a core region surrounded by and in contact with a clad layer, wherein the core region and the clad layer each have respective refractive index profiles and are configured to guide light through the waveguide fiber; wherein,the core region comprises a central region having three segments, each said segment having respective refractive index profiles, inner and outer radii, and relative index percents, beginning at the waveguide center and counting outwards, which are positive and designated .DELTA..sub.0 %, .DELTA..sub.1 %, and .DELTA..sub.2 %, and, .DELTA..sub.0 %>.DELTA..sub.2 %>.DELTA..sub.1 %, and, surrounding said central region, a power-limiting depression having an inner and an outer radius, and,the light guided through the waveguide fiber has a power distribution at 1550 nm characterized in that the ratio of power at the 25 .mu.m radius point of the waveguide to the power at the 10 micron radius point is less than about 1.times.10.sup.-4.