Junction-Temperature Measurement in InAs/InP(100) Quantum-Dot Lasers

We report on the measurement of junction temperature of the InAs/InP(100) quantum dot lasers working in the 1.55 μm wavelength region. The measurement is based on analyzing the temperature induced mode shift of the Fabry–Perot cavity. Under pulsed operation mode, more than 20°C junction temperature rise is measured for the quantum-dot (QD) laser when the duty cycle is increased from 1% to 95%. For a reference quantum well laser, the junction temperature rise is obtained as only around 3°C. The large junction temperature rise might be a crucial factor to improve the performance of QD lasers.