Abstract

In this Letter, the loss and gain characteristics of an unconventional In_xGa_1−xAs/GaAs asymmetrical step well structure consisting of variable indium contents of In_xGa_1−xAs materials are measured and analyzed for the first time, to the best of our knowledge. This special well structure is formed based on the indium-rich effect from the material growth process. The loss and gain are obtained by optical pumping and photoluminescence (PL) spectrum measurement at dual facets of an edge-emitting device. Unlike conventional quasi-rectangle wells, the asymmetrical step well may lead to a hybrid strain configuration containing both compressive and tensile strains and, thus, special loss and gain characteristics. The results will be very helpful in the development of multiple wavelength InGaAs-based semiconductor lasers.

© 2018 Chinese Laser Press

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