Abstract

In the last years the performance of quantum dot (QD) lasers could be strongly improved. Moreover, in some fields QD lasers offer advantages over QW lasers. For example, the shift of the emission wavelength caused by the intrinsic, temperature depended shift of the bandgap can be compensated with a tailored gain curve of the QD ensemble while maintaining high output powers (~3W) and wall-plug efficiencies (~55 %) [1], Thus, a temperature stable emission wavelength could be obtained by careful adjustment of the quantum dot geometry and size distribution, which would pave the way for the realization of pump sources for fibre amplifiers modules without expensive and power consumptive temperature stabilisation. In this paper, a comparative analysis of the wavelength temperature stability of high power QW (~0.3 mn/K) and QD lasers (~0.1 mn/K) is reported. The observed wavelength stability is explained by the gain curve differences between QW and QD material dependent on temperature and drive current.

© 2007 IEEE