Rare-earth-doped optical fiber having core co-doped with...

Details Rare-earth-doped optical fiber having core co-doped with... Rare-earth-doped optical fiber having core co-doped with...

2006-10-03

2006-10-03

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Optical fiber

C359S341100

Reexamination Certificate

active

07116472

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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P. F. Wysocki,Erbium-Doped Fiber Amplifiers: Advanced Topics, Ch. 11, pp. 583-680, im “Rare-Earth-Doped Fiber Lasers and Amplifiers,” Marcel Dekker, Inc., New York, ed. M. J. F. Digonnet (2001).
B. Wang et al.,Novel Erbium Doped Fiber for High Power Applications, Abstract, Asia-Pacific Optical Conference, Beijing China (Nov. 2004).

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