Abstract
A discrete higher order pumped Raman amplifier served for dispersion compensation and amplification with a fiber Bragg grating (FBG) reflecting residual first-order pump power back into it is demonstrated. The on–off Raman gain differences are analyzed between with and without FBG. Noise performance analysis shows that the higher order pumped Raman amplifier with FBG is less susceptible to multipath interference noise than without FBG, reducing system penalties at high on–off Raman gain. At the same time, the Q-factor-lowering problem is alleviated when the FBG is tailed to reflect residual first-order pump power.
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