780373.fig.005a
780373.fig.005b
780373.fig.005c
780373.fig.005d
Figure 5: The optical spectra of a single-section mode-locked semiconductor laser at the various bias currents from just above the threshold (~20 mA) to 180 mA. The device under test here is a 0.9 mm long 4-MQW active layer device [13].