title: Low-noise Raman fiber amplifier pumped by semiconductor disk laser.
abstract: A 1.3 µm Raman fiber amplifier pumped by 1.22 µm semiconductor disk laser in co-propagation geometry is demonstrated. Measured relative intensity noise of -148 dB/Hz over frequency range up to 3.5 GHz was measured at 900 mW of pump power. 9 dB gain was achieved with co-propagating pumping geometry with less than 2 dB additional noise induced by amplifier to the signal. Nearly shot-noise-limited operation of semiconductor disk laser combined with the diffraction-limited beam allows for efficient core-pumping of the single-mode fiber Raman amplifiers and represents a highly practical approach which takes full advantage of co-propagating pumping.
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: O G
authors: OG
authors: Okhotnikov
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D053844:Lasers, Solid-State; D012666:Semiconductors; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*