Suppression of the Gordon-Haus noise by a modulated Raman pump.
By launching a modulated Raman pump along with a soliton, we can reduce the random walk of solitons caused by the amplifier noise. The pump injected at one amplifier is filtered out at the next amplifier position. The group-velocity mismatch plays the role of a sliding frequency under properly chosen parameter space.
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Kumar
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Hasegawa