Temperature dependence of the bandwidth of buried heterostructure distributed feedback lasers

Reports that the etched-mesa buried-heterostructure distributed-feedback lasers ( lambda = 1.3 mu m) fabricated using semi-insulating InP blocking lasers have bandwidths in the 12-17 GHz range at 20 degrees C. 15 mW (18 GHz at 20 mW). The bandwidth decreases with increasing temperature at low powers. For the practical range of interest from 20 degrees C to 40 degrees C, the observed decrease in bandwidth is 1.0+or-0.5 GHz at 15 mW output power. A large sublinearity in the light-versus-current characteristics is generally associated with a rollover in the bandwidth power curve.<>