The temperature dependence of InGaAs single-wavelength quantum well and multi-wavelength quantum dot square resonator microlasers

In this paper, we examine the performance of distinct InGaAs quantum well and quantum dot square resonator microlasers at different temperatures (-20, 20 and 50 °C) under optical pumping. The quantum well laser operates at a single wavelength (single-mode operation is achieved by the introduction of air trenches at the nodes of a selected mode) while the quantum dot laser array operates at three distinct wavelengths 1140, 1160 and 1180 nm, which makes it suitable for coarse wavelength division multiplexing applications. We show not only multi-wavelength lasing operation on the same quantum dot chip, but also the relatively stable operation of quantum dot devices over a wide range of temperatures.