Removing modulational instabilities in low dispersion fiber cavities

We present an analytical and a numerical study of a coherently driven fiber cavity when working in a low dispersion region. We show that it is necessary to take into account the fourth order dispersion term beta4 to capture the full dynamics of the system. The results are namely, a second frequency of instability is found at the primary threshold and the stationary state can be recovered for high enough pumping intensities.