The net gain window for the GS pulses at different current values indicated in Figure
I = 386 mA, (b)
I = 420 mA, and (c)
I = 500 mA in the fundamental ML branch and (d)
I = 500 mA in the third harmonic ML branch. In the net gain window, the overall losses (brown line) and overall amplification (black line) experienced by the pulse during a complete round trip in the cavity are shown with the corresponding pulse envelope (blue dashed line). The pulse envelope in this figure corresponds to the optical intensity of the pulse propagating inside the device cavity, which relates with but is not equal to the output optical power.