Rare-earth-doped optical fiber having core co-doped with fluorine
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United States of America Patent
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Oct 3, 2006
Grant Date -
Aug 24, 2006
app pub date -
Feb 18, 2005
filing date -
Feb 18, 2005
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Abstract
A rare-earth-doped optical fiber comprises a silica core region doped with a rare earth element and a cladding region adjacent the core region, characterized in that the core region is also doped with aluminum (Al) and fluorine (F). The presence of small amounts of F are effective to lower the refractive index, and hence the NA, of the core region even in the presence of significant amounts of Al (e.g., >8 mol %). Thus, the fiber has both a relatively flat gain spectrum and a low NA (e.g., <0.20). Also described are optical amplifiers that incorporate such fibers. Preferably the rare earth composition of the core includes at least erbium, and the core is also doped with germanium.
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