Corning Incorporated

Atul D Pradhan

William Allen Wood

Frances M Smith

Rachel S Mozdy

An optical waveguide fiber amplifier comprising a core region comprises at least in part between 1300 wt.ppm and 3600 wt.ppm Er O , between 6.0 wt. % to 10.0 wt. % Al O and between 9.0 wt. % and 20.0 wt. % GeO . The amplifier also comprising an inner clad surrounding the core region and an outer clad surrounding the inner clad. The relative refractive index percentages and radii of the core region, inner clad and outer clad are chosen from the following ranges: the relative refractive index percent of the core segment within the range of from about 0.5% to about 2.0%; the relative refractive index percent of the inner clad within the range of from about 0.0% to about 0.4%; the outer radius of the core region within the range of from about 0.7 &mgr;m to about 1.5 &mgr;m; and, the outer radius of the inner clad within the range of from about 4.3 &mgr;m to about 18.8 &mgr;m.

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Elmira, NY, United States of America

Atul D Pradhan