Modulation instability in the region of the minimum group-velocity dispersion is analyzed by means of an extended nonlinear Schr\"odinger equation. It is shown that the critical modulation frequency saturates at a value determined by the fourth-order dispersion. Experimental results demonstrate the viability of generating a train of femtosecond pulses with repetition rates of a few terahertz in reasonable agreement with the theory.
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Cavalcanti et al. (1991) studied this question.
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