Temperature dependence of electrical and optical modulationresponses of quantum-well lasers

摘要

We present theory and experiment for high-speed optical injectionnin the absorption region of a quantum-well laser and compare the resultsnwith those of electrical injection including the carrier transportneffect. We show that the main difference between the two responses isnthe low-frequency roll-off. By using both injection methods, we obtainnmore accurate and consistent measurements of many important dynamicnlaser parameters, including the differential gain, carrier lifetime, Knfactor, and gain compression factor. Temperature-dependent data of thentest laser are presented which show that the most dominant effect is thenlinear degradation of differential gain and injection efficiency withnincreasing temperature. While the K-factor is insensitive to temperaturenvariation for multiple-quantum-well lasers, we find that the carrierncapture time and nonlinear gain suppression coefficient decreases asntemperature increases