Two main limitations to the capacity of a long-haul soliton communication system are the amplified spontaneous emission noise-induced [or Gordon-Haus (GH)] time jitter of the output pulses1 and soliton-soliton interactions. In recent years, several methods have been proposed and demonstrated for controlling the stability of optical soliton transmissions. For example, the use of in-line filters,2 synchronous modulation,3 and phase-sensitive parametric amplification in a quadratic nonlinear device that is pumped by the second harmonic of the signal4 have been discussed. In this work, I show that a simple way to control and suppress both the GH jitter and pulse interactions is the periodic injection of a weak cw or time-modulated beam with the same frequency of the soliton signal.5

© 1996 Optical Society of America

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