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Gain saturation in fiber Raman amplifiers due to stimulated Brillouin scattering

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4 Author(s)
Foley, B. ; GTE Lab. Inc., Waltham, MA, USA ; Dakss, Mark L. ; Davies, R. ; Melman, Paul

The effects of stimulated Brillouin scattering (SBS) on Raman gain are explored. Measurements of gain in a fiber Raman amplifier show a saturation at low gain levels. Experimental data and a theoretical model are presented, demonstrating that this saturation is due to pump depletion by SBS. This effect also leads to Raman gain fluctuations arising from mode partitioning in a multimode pump laser. Two ways to avoid the deleterious effects of SBS on the performance of Raman amplifiers are suggested. One is to use a multimode semiconductor laser with a modal linewidth of the order of a few hundred megahertz, which leads to a strongly reduced Brillouin gain coefficient. The second approach is to use very short pump pulses in a backward configuration

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Lightwave Technology, Journal of  (Volume:7 ,  Issue: 12 )