Using nonlinear LC networks which are equivalent to a one dimensional nonlinear lattice, the solitariness and the recurrence phenomena are experimentally investigated for a pair of soliton trains of which the phases are independently modulated. Using a phase modulation system, up to 30% modulation is obtained. This modulation ratio is about 3 time larger than that for an amplitude modulation system.
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Suzuki et al. (1973) studied this question.