Quantum capture limited modulation bandwidth of quantum well, wire, and dot lasers

We investigate the quantum capture limited modulation bandwidths of various lower-dimensional semiconductor lasers. It is shown that, for buried quantum well, wire, and dot lasers, the maximum bandwidth is proportional to the packing density of the active region. For the quantum wire lasers grown on V-grooved substrates, the maximum bandwidth is enhanced by the precapture of carriers from three-dimensional states to two-dimensional states before the capture into the one-dimensional states.