High Gain 1300 nm Quantum Dot Lasers

In this work, we show that a modal gain as high as 42cm^-1 could be achieved from a device containing 7 InAs/InGaAs stacked QD layers. The enhancement of the modal gain is accompanied by a decrease of the threshold and transparency current densities per QD layer down to 16 and 7 A cm-2, respectively. Moreover, a linear increase of the modal gain with the number of QD layers is observed. The obtained high modal gain allows us to achieve good temperature stability and high-speed operation in a wide temperature range. Modulation eye diagrams under 10 Gb/s are achieved in 15degC-50degC range in a single- transverse mode 1.3mum QD lasers. High characteristic temperature of about 110 K between 15degC and 85degC are reported.