Chamorovskiy A, Rautiainen J, Rantamäki A, Okhotnikov O G
Optoelectronics Research Centre, Tampere University of Technology, Tampere, Finland.
Opt Express. 2011 Mar 28;19(7):6414-9. doi: 10.1364/OE.19.006414.
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.
展示了一种采用共泵浦结构、由1.22 µm半导体盘激光器泵浦的1.3 µm拉曼光纤放大器。在泵浦功率为900 mW时，在高达3.5 GHz的频率范围内测得的相对强度噪声为-148 dB/Hz。采用共泵浦结构实现了9 dB的增益，放大器对信号产生的额外噪声小于2 dB。半导体盘激光器接近散粒噪声极限的运行与衍射极限光束相结合，使得单模光纤拉曼放大器能够实现高效的纤芯泵浦，这是一种充分利用共泵浦优势的高度实用的方法。
