title: 1.3 µm Raman-bismuth fiber amplifier pumped by semiconductor disk laser.
abstract: A hybrid Raman-bismuth fiber amplifier pumped in co-propagation configuration by a single 1.22 µm semiconductor disk laser is presented. The unique attribute of this dual-gain system is that both amplifiers require the pump source with the same wavelength because pump-Stokes spectral shift in 1.3 µm Raman amplifier and pump-gain bandwidth separation in 1.3 µm bismuth fiber amplifier have the same value. Residual pump power at the output of Raman amplifier in this scheme is efficiently consumed by bismuth-doped fiber thus increasing the overall conversion efficiency. The small-signal gain of 18 dB at 1.3 W of pump power has been achieved for hybrid scheme which is by 9 dB higher as compared with isolated Raman amplifier without bismuth fiber. Low noise performance of pump semiconductor disk laser with RIN of -150 dB/Hz combined with nearly diffraction-limited beam quality and Watt-level output powers allows for efficient core-pumping of a single-mode fiber amplifier systems and opens up new opportunities for amplification in O-band spectral range.
authors: Optoelectronics Research Centre, Tampere University of Technology, Tampere, Finland. alexander.chamorovskiy@tut.fi
authors: A
authors: A
authors: Chamorovskiy
authors: J
authors: J
authors: Rautiainen
authors: A
authors: A
authors: Rantamäki
authors: K M
authors: KM
authors: Golant
authors: O G
authors: OG
authors: Okhotnikov
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D053844:Lasers, Solid-State; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D018511:Systems Integration