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While the amplifier optimized for small-signal amplification in the spectral range 1820-2020 nm is based on a thulium-doped silica-based optical fiber with a standard refractive index profile, the amplifier optimized for amplification in the range 1650-1820 nm is based on a thulium-doped optical fiber with a specially tailored internal waveguide structure effectively suppressing guided modes at the longer wavelengths of the thulium emission band and simultaneously promoting mode propagation at the shorter wavelengths. We present the values of the output properties for both types of amplifiers, such as small-signal gain or noise figure. |
