Germania-glass-based core silica glass cladding single-mode fibers (Δn up to 0.143) with a minimum loss of 20 dB/km at 1.9 μm were fabricated by the modified chemical vapor deposition (MCVD) method. The fibers exhibit strong photorefractivity with the type-IIa-induced refractive-index modulation of 2×10-3. The Raman gain of 300 to 59 dB/(km·W) was determined at 1.07 to 1.6 μm, respectively, in a 75 mol.% GeO2 core fiber. Only 3 m of such fibers are enough for the creation of a 10-W Raman laser at 1.12 μm with a 13-W pump at 1.07 μm. Raman generation in optical fiber at a wavelength of 2.2 μm was obtained for the first time.