Abstract

Germania-glass-core silica-glass-cladding single-mode fibers (Δn as great as 0.143) with a minimum loss of 20 dB/km at 1.85 µm were fabricated by modified chemical-vapor deposition. The fibers exhibit strong photorefractivity, with type IIa index modulation of 2×10-3. A Raman gain of 300 dB/(km W) was determined at 1.12 µm. Only 3 m of such fibers is sufficient for constructing the 10-W Raman laser at 1.12 µm with a 13-W pump at 1.07 µm.

© 2004 Optical Society of America

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