Effect of stimulated Brillouin scattering on the gain saturation of distributed fiber Raman amplifier and its suppression by phase modulation

Zhang Yi-Chi^a),^b), Chen Wei^a),^b), Sun Shi-Lin^a),^b), Meng Zhou†^a),^b)

Experimental results of on–off gain versus input signal power. The inset shows the small signal gains versus input signal power.