Generation of dark soliton trains with high repetiton rates through dissipative four wave mixing

Model of fibre ring laser with an intracavity interferometer mode-locked through dissipative four-wave mixing is considered. The conditions required for mode locking are formulated. Characteristics of numerically simulated pulse trains at different repetition rates and gain levels are obtained. Admissible ranges of gain and repetition rate, for which successful mode locking is possible, are found. It is shown that for normal dispersion cavity the laser can generate a train of dark solitons with an energy much greater than that in the case of cavity with anomalous dispersion.