The red dash-dot line and the blue dashed line represent the transmission of the SGLE and the CQGLE, respectively. The black solid lines denote the saturating gain curves. The intersection of the gain and transmission curves represents a stable mode-locked pulse. The green circles are the maximum power allowed in the laser cavity. When energy is increased, gain curve 1 shifts towards gain curve 2, causing the mode-locked pulses A and B to exceed the maximum power allowed. In the CQGLE, the solution jumps to the next most energetically favorable configuration of a double-pulse solution (not shown). A high-energy single-pulse solution (point C) can exist in the SGLE model (from [29], 2011, IEEE).
