Abstract
We report a fabrication route to achieve highly GeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -doped silica fibers with GeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> molar concentration as high as 74% using the conventional modified chemical vapor deposition (MCVD) process. The dependence of background loss on fiber frozen-in stress in these highly doped fibers is investigated. A central dip of refractive index in the core is found to introduce stress variation, and contribute to the background loss. Dispersion control and supercontinuum generation in 2.1-2.8-μm region using the 74-mol% fiber are also presented.
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