HIGH-TEMPERATURE SINGLE-MODE OPERATION OF 1.3-MU-M STRAINED MQW GAIN-COUPLED DFB LASERS

Single-mode and high-power operation at temperatures up to 120 degrees C has been achieved in 1.3-mu m strained MQW gain-coupled DFB lasers. A stable lasing wavelength is maintained due to a large modal facet l oss difference of the two Bragg modes, which is provided by the gain-c oupling effect. A very low temperature dependence of the threshold cur rent has been obtained by detuning the lasing wavelength to the long w avelength side of the material gain peak at room temperature, which ef fectively compensates the waveguide loss at higher temperatures. An in finite characteristic temperature T-o can be realized at certain range s of temperature depending on the detuning value.