InAs quantum dot DFB lasers on GaAs for uncooled 1310 nm fiber communication

We have reported the temperature and high-speed performance for DWELL FP and DFB lasers at wavelengths near 1310 nm. The positive gain-offset clearly improves the temperature performance of the QD DFB lasers, resulting in a constant threshold current and slope efficiency in the temperature range from 10 to 50°C. A threshold current as low as 10.5 mA with a 3 mW output power at 100°m and 9 GHz 3-dB bandwidth at room temperature were obtained. By utilizing the p-doped active region, which improves both T₀ and the bandwidth, low-threshold temperature-independent QD FP and DFB lasers with 3-dB modulation bandwidth well above 10 GHz can be expected in the near future for 1310 nm uncooled applications.