Fig. 2. Laser characterization.

a The  light-current (LI) curve without temperature stabilization and (b) single-mode (SM) lasing at 80 mA for a temperature range of 20–80 °C, without power tuning. c False color plot of the time-averaged optical spectrum as a function of the upswept drive current, with the x axis matched to that of (a). From the change in the lasing wavelength, we can deduce an increase in PhC temperature of 15 °C. d Delayed self-heterodyne measurement of the laser linewidth in a single-mode region. The central frequency of the acousto-optic modulator (AOM) was 55 MHz; the measured linewidth Δν = 4.5 MHz