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Advances in OptoElectronics
Volume 2016 (2016), Article ID 5843636, 7 pages
Research Article

Noise Gain Features of Fiber Raman Amplifier

Taras Shevchenko National University of Kyiv, 4g, Academician Glushkov Prospect, Kyiv 03022, Ukraine

Received 21 April 2016; Accepted 14 June 2016

Academic Editor: Somenath N. Sarkar

Copyright © 2016 Georgii S. Felinskyi and Mykhailo Y. Dyriv. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The formation dynamics of the optical noise in a silica single mode fiber (SMF) as function of the pump power variation in the counter pumped fiber Raman amplifier (FRA) is experimentally studied. The ratio between the power of amplified spontaneous emission and the power of incoherent optical noise is quantitatively determined by detailed analysis of experimental data in the pump powers range of 100–300 mW within the full band of Stokes frequencies, including FRA working wavelengths over the C + L transparency windows. It is found out the maximum of Raman gain coefficient for optical noise does not exceed ~60% of corresponding peak at the gain profile maximum of coherent signal. It is shown that the real FRA noise figure may be considerably less than 3 dB over a wide wavelength range (100 nm) at a pump power of several hundreds of mW.