Intensity noise in quantum-dot laser diodes

We present intensity noise studies of a self-organized InAs/GaAs quantum-do t laser. The noise power measured for the full emission spectrum was found to be smaller than that for separate longitudinal mode groups. This noise c ancellation indicates that the intensity fluctuations of the mode groups we re anticorrelated, with typical values of the normalized correlation coeffi cient of around -0.50. This surprisingly high value is not consistent with the model of the quantum-dot laser as an inhomogeneous ensemble of independ ent microlasers. (C) 2001 American Institute of Physics.